RETEVMO

1 INDICATIONS AND USAGE RETEVMO ® is a kinase inhibitor indicated for the treatment of: Adult patients with locally advanced or metastatic non-small cell lung cancer (NSCLC) with a rearranged during transfection (RET) gene fusion, as detected by an FDA-approved test ( 1.1 ) Adult and pediatric patients 2 years of age and older with advanced or metastatic medullary thyroid cancer (MTC) with a RET mutation, as detected by an FDA-approved test, who require systemic therapy ( 1.2 ) Adult and pediatric patients 2 years of age and older with advanced or metastatic thyroid cancer with a RET gene fusion, as detected by an FDA-approved test, who require systemic therapy and who are radioactive iodine-refractory (if radioactive iodine is appropriate) ( 1.3 ) Adult and pediatric patients 2 years of age and older with locally advanced or metastatic solid tumors with a RET gene fusion, as detected by an FDA-approved test, that have progressed on or following prior systemic treatment or who have no satisfactory alternative treatment options ( 1.4 ) 1.1 RET Fusion-Positive Non-Small Cell Lung Cancer RETEVMO ® is indicated for the treatment of adult patients with locally advanced or metastatic non-small cell lung cancer (NSCLC) with a rearranged during transfection (RET) gene fusion, as detected by an FDA-approved test. 1.2 RET -Mutant Medullary Thyroid Cancer RETEVMO is indicated for the treatment of adult and pediatric patients 2 years of age and older with advanced or metastatic medullary thyroid cancer (MTC) with a RET mutation, as detected by an FDA-approved test, who require systemic therapy. 1.3 RET Fusion-Positive Thyroid Cancer RETEVMO is indicated for the treatment of adult and pediatric patients 2 years of age and older with advanced or metastatic thyroid cancer with a RET gene fusion, as detected by an FDA-approved test, who require systemic therapy and who are radioactive iodine-refractory (if radioactive iodine is appropriate). 1.4 Other RET Fusion-Positive Solid Tumors RETEVMO is indicated for the treatment of adult and pediatric patients 2 years of age and older with locally advanced or metastatic solid tumors with a RET gene fusion, as detected by an FDA-approved test, that have progressed on or following prior systemic treatment or who have no satisfactory alternative treatment options.

2 DOSAGE AND ADMINISTRATION Select patients for treatment with RETEVMO based on the presence of a RET gene fusion (NSCLC, thyroid, or other solid tumors) or specific RET gene mutation (MTC). ( 2.1 , 14 ) Adult and adolescent patients 12 years of age or older : the recommended dosage is based on weight ( 2.3 ): Less than 50 kg: 120 mg orally twice daily 50 kg or greater: 160 mg orally twice daily Pediatric patients 2 to less than 12 years of age: the recommended dosage is based on body surface area ( 2.3 ): 0.33 m 2 to 0.65 m 2 : 40 mg orally three times daily 0.66 m 2 to 1.08 m 2 : 80 mg orally twice daily 1.09 m 2 to 1.52 m 2 : 120 mg orally twice daily ≥1.53 m 2 : 160 mg orally twice daily For patients who cannot swallow, disperse 40 mg RETEVMO tablets and administer orally or via gastrostomy or nasogastric tube ( 2.8 ) Only RETEVMO 40 mg tablets may be used to create the dispersion ( 2.2 ) Reduce RETEVMO dose in patients with severe hepatic impairment. ( 2.7 , 8.7 ) 2.1 Patient Selection Select patients for treatment with RETEVMO based on the presence of a RET gene fusion (NSCLC, thyroid cancer, or other solid tumors) or specific RET gene mutation (MTC) in tumor specimens [see Clinical Studies ( 14 )] . Information on FDA-approved test(s) for the detection of RET gene fusions and RET gene mutations is available at: http://www.fda.gov/CompanionDiagnostics. An FDA-approved companion diagnostic test for the detection of RET gene fusions and RET gene mutations in plasma is not available. 2.2 Important Administration Instructions RETEVMO may be taken with or without food unless coadministered with a proton pump inhibitor (PPI) [see Dosage and Administration ( 2.4 ), Clinical Pharmacology ( 12.3 )]. Swallow the capsule or tablet whole. Do not crush or chew the capsules or tablets. For patients unable to swallow capsules or tablets or who are using a feeding tube, prepare and administer RETEVMO as a dispersion; only RETEVMO 40 mg tablets may be used to create the dispersion [see Dosage and Administration ( 2.8 )]. 2.3 Recommended Dosage The recommended dosage of RETEVMO administered as recommended [see Dosage and Administration ( 2.2 )] and given until disease progression or unacceptable toxicity is shown in Table 1 : Table 1: Recommended RETEVMO Dosage Population RETEVMO Dosage Adult and adolescent patients 12 years of age or older based on body weight Less than 50 kg 120 mg twice daily 50 kg or greater 160 mg twice daily Pediatric patients 2 to less than 12 years of age based on body surface area 0.33 to 0.65 m 2 40 mg three times daily 0.66 to 1.08 m 2 80 mg twice daily 1.09 to 1.52 m 2 120 mg twice daily ≥1.53 m 2 160 mg twice daily Dosing pediatric patients with body surface area less than 0.33 m 2 is not recommended Missed Dose Do not take a missed dose unless it is more than 6 hours until next scheduled dose. Vomiting If vomiting occurs after RETEVMO administration, do not take an additional dose and continue to the next scheduled time for the next dose. 2.4 Dosage Modifications for Concomitant Use of Acid-Reducing Agents Avoid concomitant use of a PPI, a histamine-2 (H2) receptor antagonist, or a locally-acting antacid with RETEVMO [see Drug Interactions ( 7.1 )] . If concomitant use cannot be avoided: Take RETEVMO with food when coadministered with a PPI. Take RETEVMO 2 hours before or 10 hours after administration of an H2 receptor antagonist. Take RETEVMO 2 hours before or 2 hours after administration of a locally-acting antacid. 2.5 Dosage Modifications for Adverse Reactions The recommended dose reductions for adverse reactions are provided in Table 2 . Table 2: Recommended RETEVMO Dose Reductions for Adverse Reactions Current RETEVMO Dosage Dose Reduction First Second Third 40 mg three times daily 40 mg twice daily 40 mg once daily permanently discontinue 80 mg twice daily 40 mg twice daily 40 mg once daily permanently discontinue 120 mg twice daily 80 mg twice daily 40 mg twice daily 40 mg once daily 160 mg twice daily 120 mg twice daily 80 mg twice daily 40 mg twice daily Permanently discontinue RETEVMO in patients unable to tolerate three dose reductions. The recommended dosage modifications for adverse reactions are provided in Table 3 . Table 3: Recommended RETEVMO Dosage Modifications for Adverse Reactions Adverse Reaction Severity Dosage Modification Hepatotoxicity [see Warnings and Precautions ( 5.1 )] Grade 3 or Grade 4 Withhold RETEVMO and monitor AST/ALT once weekly until resolution to Grade 1 or baseline. Resume at reduced dose by 2 dose levels and monitor AST and ALT once weekly until 4 weeks after reaching dose taken prior to the onset of Grade 3 or 4 increased AST or ALT. Increase dose by 1 dose level after a minimum of 2 weeks without recurrence and then increase to dose taken prior to the onset of Grade 3 or 4 increased AST or ALT after a minimum of 4 weeks without recurrence. Interstitial Lung Disease/ Pneumonitis [see Warnings and Precautions ( 5.2 )] Grade 2 Withhold RETEVMO until resolution. Resume at a reduced dose. Discontinue RETEVMO for recurrent ILD/pneumonitis. Grade 3 or Grade 4 Discontinue RETEVMO for confirmed ILD/pneumonitis. Hypertension [see Warnings and Precautions ( 5.3 )] Grade 3 Withhold RETEVMO for Grade 3 hypertension that persists despite optimal antihypertensive therapy. Resume at a reduced dose when hypertension is controlled. Grade 4 Discontinue RETEVMO. QT Interval Prolongation [see Warnings and Precautions ( 5.4 )] Grade 3 Withhold RETEVMO until recovery to baseline or Grade 0 or 1. Resume at a reduced dose or permanently discontinue RETEVMO. Grade 4 Discontinue RETEVMO. Hemorrhagic Events [see Warnings and Precautions ( 5.5 )] Grade 3 or Grade 4 Withhold RETEVMO until recovery to baseline or Grade 0 or 1. Discontinue RETEVMO for severe or life-threatening hemorrhagic events. Hypersensitivity Reactions [see Warnings and Precautions ( 5.6 )] Grades 1-3 Withhold RETEVMO until resolution of the event. Initiate corticosteroids. Resume at a reduced dose by 3 dose levels while continuing corticosteroids. Increase dose by 1 dose level each week until the dose taken prior to the onset of hypersensitivity is reached, then taper corticosteroids. Discontinue RETEVMO for any severe skin reaction including Stevens-Johnson Syndrome. Recurrent Grade 3 or Grade 4 Discontinue RETEVMO. Hypothyroidism [see Warnings and Precautions ( 5.9 )] Grade 3 or Grade 4 Withhold RETEVMO until resolution to Grade 1 or baseline. Discontinue RETEVMO based on severity. Other Adverse Reactions [see Adverse Reactions ( 6.1 )] Grade 3 or Grade 4 Withhold RETEVMO until recovery to baseline or Grade 0 or 1. Resume at a reduced dose. 2.6 Dosage Modifications for Concomitant Use of Strong and Moderate CYP3A Inhibitors Avoid concomitant use of strong and moderate CYP3A inhibitors with RETEVMO. If concomitant use of a strong or moderate CYP3A inhibitor cannot be avoided, reduce the RETEVMO dose as recommended in Table 4 . After the inhibitor has been discontinued for 3 to 5 elimination half-lives, resume RETEVMO at the dose taken prior to initiating the CYP3A inhibitor [see Drug Interactions ( 7.1 )] . Table 4: Recommended RETEVMO Dosage for Concomitant Use of Strong and Moderate CYP3A Inhibitors Current RETEVMO Dosage Recommended RETEVMO Dosage Moderate CYP3A Inhibitor Strong CYP3A Inhibitor 40 mg orally three times daily 40 mg orally once daily 40 mg orally once daily 80 mg orally twice daily 40 mg orally twice daily 40 mg orally twice daily 120 mg orally twice daily 80 mg orally twice daily 40 mg orally twice daily 160 mg orally twice daily 120 mg orally twice daily 80 mg orally twice daily 2.7 Dosage Modification for Severe Hepatic Impairment Reduce the recommended dosage of RETEVMO for patients with severe hepatic impairment as recommended in Table 5 [see Use in Specific Populations ( 8.7 )] . Table 5: Recommended RETEVMO Dosage for Severe Hepatic Impairment Current RETEVMO Dosage Recommended RETEVMO Dosage 40 mg orally three times daily 40 mg orally twice daily 80 mg orally twice daily 40 mg orally twice daily 120 mg orally twice daily 80 mg orally twice daily 160 mg orally twice daily 80 mg orally twice daily 2.8 Alternative Administration for Patients Unable to Swallow Tablets or Capsules For patients unable to swallow whole capsules or tablets, the 40 mg tablet may be dispersed and administered orally or via gastrostomy or nasogastric tube. Use only the 40 mg tablet to make the dispersion. RETEVMO 40 mg tablets for Oral Administration To prepare RETEVMO tablet as a dispersion: In a glass or medicine cup, add the correct number of 40 mg RETEVMO tablets required for the prescribed dose (1, 2, 3, or 4 tablets), to approximately 1 tablespoon (15 mL) of room temperature or chilled water or 100% carrot puree. Stir intermittently until tablet(s) have dispersed (approximately 7 to 10 minutes). Some settling may occur and the dispersion may appear cloudy if water is used. Administer the entire dispersion immediately. Add 1 tablespoon (15 mL) of water to the glass or medicine cup, swirl or stir to collect any remaining medicine and administer immediately. Discard RETEVMO dispersion if not taken within 2 hours. RETEVMO 40 mg tablets for Feeding Tubes (Gastrostomy or Nasogastric Tube) Administration Use only polyurethane (French size 8 or larger) or vinyl chloride (French size 10 or larger) nasogastric tube or silicone (French size 14 or larger) gastrostomy tube. In a glass or medicine cup, add the correct number of 40 mg RETEVMO tablet(s) required for the prescribed dose (1, 2, 3, or 4 tablets), to a minimum of 10 mL of room temperature water. Stir intermittently until tablet(s) have dispersed (approximately 7 to 10 minutes). Some settling may occur and the dispersion may appear cloudy. Flush the feeding tube according to manufacturer's instructions. Draw the dispersion into an enteral syringe and administer the dispersion via the feeding tube immediately. Add 5 mL of water to the glass or medicine cup, swirl or stir to collect any remaining medicine, and deliver this rinse via the feeding tube using the same syringe. Repeat rinse as necessary to ensure full dose is delivered. Flush the feeding tube according to manufacturer's instructions. Discard RETEVMO dispersion if not taken within 2 hours.

4 CONTRAINDICATIONS None. None. ( 4 )

5 WARNINGS AND PRECAUTIONS Hepatotoxicity: Monitor ALT and AST prior to initiating RETEVMO, every 2 weeks during the first 3 months, then monthly thereafter and as clinically indicated. Withhold, reduce the dose, or permanently discontinue RETEVMO based on severity. ( 2.5 , 5.1 ) Interstitial Lung Disease (ILD)/Pneumonitis: Monitor for new or worsening pulmonary symptoms. Withhold, reduce the dose or permanently discontinue RETEVMO based on severity. ( 2.5 , 5.2 ) Hypertension: Do not initiate RETEVMO in patients with uncontrolled hypertension. Optimize blood pressure (BP) prior to initiating RETEVMO. Monitor BP after 1 week, at least monthly thereafter and as clinically indicated. Withhold, reduce the dose, or permanently discontinue RETEVMO based on severity. ( 2.5 , 5.3 ) QT Interval Prolongation: Monitor patients who are at significant risk of developing QTc prolongation. Assess QT interval, electrolytes and TSH at baseline and periodically during treatment. Monitor QT interval more frequently when RETEVMO is concomitantly administered with strong and moderate CYP3A inhibitors or drugs known to prolong QTc interval. Withhold and reduce the dose or permanently discontinue RETEVMO based on severity. ( 2.5 , 5.4 ) Hemorrhagic Events: Permanently discontinue RETEVMO in patients with severe or life-threatening hemorrhage. ( 2.5 , 5.5 ) Hypersensitivity: Withhold RETEVMO and initiate corticosteroids. Upon resolution, resume at a reduced dose and increase dose by 1 dose level each week until reaching the dose taken prior to onset of hypersensitivity. Continue steroids until patient reaches target dose and then taper. ( 2.5 , 5.6 ) Tumor Lysis Syndrome: Closely monitor patients at risk and treat as clinically indicated. ( 5.7 ) Risk of Impaired Wound Healing: Withhold RETEVMO for at least 7 days prior to elective surgery. Do not administer for at least 2 weeks following major surgery and until adequate wound healing. The safety of resumption of RETEVMO after resolution of wound healing complications has not been established. ( 5.8 ) Hypothyroidism: Monitor thyroid function before treatment with RETEVMO and periodically during treatment. Withhold until clinically stable or permanently discontinue based on severity. ( 5.9 ) Embryo-Fetal Toxicity: Can cause fetal harm. Advise females of reproductive potential of the possible risk to a fetus and to use effective contraception. ( 5.10 , 8.1 , 8.3 ) Slipped Capital Femoral Epiphysis/Slipped Upper Femoral Epiphysis (SCFE/SUFE) in Pediatric Patients: Monitor patients for symptoms indicative of SCFE/SUFE and treat as medically and surgically appropriate ( 5.11 , 6.1 ) 5.1 Hepatotoxicity Serious hepatic adverse reactions occurred in 4.6% of patients treated with RETEVMO. Increased AST occurred in 62% of patients, including Grade 3 or 4 events in 11% and increased ALT occurred in 58% of patients, including Grade 3 or 4 events in 13% [see Adverse Reactions ( 6.1 )] . The median time to first onset for increased AST was 5 weeks (range: 4.9 days to 6 years) and increased ALT was 4.9 weeks (range: 6 days to 5 years). Monitor ALT and AST prior to initiating RETEVMO, every 2 weeks during the first 3 months, then monthly thereafter and as clinically indicated. Withhold, reduce the dose or permanently discontinue RETEVMO based on the severity [see Dosage and Administration ( 2.5 )] . 5.2 Interstitial Lung Disease/Pneumonitis Severe, life-threatening, and fatal interstitial lung disease (ILD)/pneumonitis can occur in patients treated with RETEVMO. ILD/pneumonitis occurred in 3% of patients who received RETEVMO, including 0.3% with Grade 3 or 4 events, and 0.2% with fatal reactions. Monitor for pulmonary symptoms indicative of ILD/pneumonitis. Withhold RETEVMO and promptly investigate for ILD in any patient who presents with acute or worsening of respiratory symptoms which may be indicative of ILD (e.g., dyspnea, cough, and fever). Withhold, reduce the dose or permanently discontinue RETEVMO based on severity of confirmed ILD [ see Dosage and Administration ( 2.5 ) ]. 5.3 Hypertension Hypertension occurred in 43% of patients, including Grade 3 hypertension in 20% and Grade 4 in one (0.1%) patient [see Adverse Reactions ( 6.1 )] . Overall, 6.4% had their dose interrupted, 1.5% had their dose reduced, and 0.2% discontinued RETEVMO for hypertension. Treatment-emergent hypertension was most commonly managed with anti-hypertension medications. Do not initiate RETEVMO in patients with uncontrolled hypertension. Optimize blood pressure prior to initiating RETEVMO. Monitor blood pressure after 1 week, at least monthly thereafter and as clinically indicated. Initiate or adjust anti-hypertensive therapy as appropriate. Withhold, reduce the dose, or permanently discontinue RETEVMO based on the severity [see Dosage and Administration ( 2.5 )] . 5.4 QT Interval Prolongation RETEVMO can cause concentration-dependent QT interval prolongation [see Clinical Pharmacology ( 12.2 )] . An increase in QTcF interval to >500 ms was measured in 8% of patients and an increase in the QTcF interval of at least 60 ms over baseline was measured in 22% of patients [see Adverse Reactions ( 6.1 )] . RETEVMO has not been studied in patients with clinically significant active cardiovascular disease or recent myocardial infarction. Monitor patients who are at significant risk of developing QTc prolongation, including patients with known long QT syndromes, clinically significant bradyarrhythmias, and severe or uncontrolled heart failure. Assess QT interval, electrolytes and TSH at baseline and periodically during treatment, adjusting frequency based upon risk factors including diarrhea. Correct hypokalemia, hypomagnesemia, and hypocalcemia prior to initiating RETEVMO and during treatment. Monitor the QT interval more frequently when RETEVMO is concomitantly administered with strong and moderate CYP3A inhibitors or drugs known to prolong QTc interval. Withhold and reduce the dose or permanently discontinue RETEVMO based on the severity [see Dosage and Administration ( 2.5 )] . 5.5 Hemorrhagic Events Serious including fatal hemorrhagic events can occur with RETEVMO. Grade ≥3 hemorrhagic events occurred in 4.3% of patients treated with RETEVMO, including 4 (0.5%) patients with fatal hemorrhagic events, including cerebral hemorrhage (n = 2), tracheostomy site hemorrhage, and hemoptysis (1 each). Permanently discontinue RETEVMO in patients with severe or life-threatening hemorrhage [see Dosage and Administration ( 2.5 )] . 5.6 Hypersensitivity RETEVMO can cause hypersensitivity, including severe skin reactions such as Stevens-Johnson Syndrome. All grade hypersensitivity occurred in 6% of patients receiving RETEVMO, including Grade 3 in 2%. The median time to onset was 1.9 weeks (range: 5 days to 6.5 years). Signs and symptoms of hypersensitivity included fever, rash and arthralgias or myalgias with concurrent decreased platelets or transaminitis. Stevens Johnsons Syndrome has been observed in the post-marketing setting [see Adverse Reactions ( 6.2 )]. Discontinue RETEVMO in patients with Stevens Johnson Syndrome. If hypersensitivity occurs, withhold RETEVMO and begin corticosteroids at a dose of 1 mg/kg prednisone (or equivalent). Upon resolution of the event, resume RETEVMO at a reduced dose and increase the dose of RETEVMO by 1 dose level each week as tolerated until reaching the dose taken prior to onset of hypersensitivity [see Dosage and Administration ( 2.5 )] . Continue steroids until patient reaches target dose and then taper. Permanently discontinue RETEVMO for recurrent hypersensitivity. 5.7 Tumor Lysis Syndrome Tumor lysis syndrome (TLS) occurred in 0.9% of patients with medullary thyroid carcinoma and 0.3% of patients with non-small cell lung cancer receiving RETEVMO [see Adverse Reactions ( 6.1 )] . Patients may be at risk of TLS if they have rapidly growing tumors, a high tumor burden, renal dysfunction, or dehydration. Closely monitor patients at risk, consider appropriate prophylaxis including hydration, and treat as clinically indicated. 5.8 Risk of Impaired Wound Healing Impaired wound healing can occur in patients who receive drugs that inhibit the vascular endothelial growth factor (VEGF) signaling pathway. Therefore, RETEVMO has the potential to adversely affect wound healing. Withhold RETEVMO for at least 7 days prior to elective surgery. Do not administer for at least 2 weeks following major surgery and until adequate wound healing. The safety of resumption of RETEVMO after resolution of wound healing complications has not been established. 5.9 Hypothyroidism RETEVMO can cause hypothyroidism. Hypothyroidism occurred in 15% of patients treated with RETEVMO; all reactions were Grade 1 or 2. Hypothyroidism occurred in 15% of patients (59/390) with thyroid cancer and 14% of patients (65/467) with other solid tumors including NSCLC [see Adverse Reactions ( 6.1 )] . Monitor thyroid function before treatment with RETEVMO and periodically during treatment. Treat with thyroid hormone replacement as clinically indicated. Withhold RETEVMO until clinically stable or permanently discontinue RETEVMO based on severity [see Dosage and Administration ( 2.5 )] . 5.10 Embryo-Fetal Toxicity Based on data from animal reproduction studies and its mechanism of action, RETEVMO can cause fetal harm when administered to a pregnant woman. Administration of selpercatinib to pregnant rats during organogenesis at maternal exposures that were approximately equal to those observed at the recommended human dose of 160 mg twice daily resulted in embryolethality and malformations. Advise pregnant women and females of reproductive potential of the potential risk to a fetus. Advise females of reproductive potential to use effective contraception during treatment with RETEVMO and for 1 week after the last dose. Advise males with female partners of reproductive potential to use effective contraception during treatment with RETEVMO and for 1 week after the last dose [see Use in Specific Populations ( 8.1 , 8.3 )] . 5.11 Slipped Capital Femoral Epiphysis/Slipped Upper Femoral Epiphysis in Pediatric Patients Slipped capital femoral epiphysis/slipped upper femoral epiphysis (SCFE/SUFE) occurred in 1 adolescent (2.8% of 36 patients) receiving RETEVMO in LIBRETTO-121 and 1 adolescent (0.5% of 193 patients) receiving RETEVMO in LIBRETTO-531 [see Adverse Reactions ( 6.1 )]. Monitor patients for symptoms indicative of SCFE/SUFE and treat as medically and surgically appropriate.

7 DRUG INTERACTIONS Acid-Reducing Agents: Avoid coadministration. If coadministration cannot be avoided, take RETEVMO with food (with PPI) or modify its administration time (with H2 receptor antagonist or locally-acting antacid). ( 2.4 , 7.1 ) Strong and Moderate CYP3A Inhibitors: Avoid coadministration. If coadministration cannot be avoided, reduce the RETEVMO dose. ( 2.6 , 7.1 ) Strong and Moderate CYP3A Inducers: Avoid coadministration. ( 7.1 ) CYP2C8 and CYP3A Substrates: Avoid coadministration. If coadministration cannot be avoided, modify the substrate dosage as recommended in its product labeling. ( 7.2 ) Certain P-gp and BCRP Substrates: Avoid coadministration. If coadministration cannot be avoided, modify the substrate dosage as recommended in its product labeling. ( 7.2 ) 7.1 Effects of Other Drugs on RETEVMO Acid-Reducing Agents Concomitant use of RETEVMO with acid-reducing agents decreases selpercatinib plasma concentrations [see Clinical Pharmacology ( 12.3 )] , which may reduce RETEVMO anti-tumor activity. Avoid concomitant use of PPIs, H2 receptor antagonists, and locally-acting antacids with RETEVMO. If coadministration cannot be avoided, take RETEVMO with food (with a PPI) or modify its administration time (with a H2 receptor antagonist or a locally-acting antacid) [see Dosage and Administration ( 2.4 )] . Strong and Moderate CYP3A Inhibitors Concomitant use of RETEVMO with a strong or moderate CYP3A inhibitor increases selpercatinib plasma concentrations [see Clinical Pharmacology ( 12.3 )] , which may increase the risk of RETEVMO adverse reactions, including QTc interval prolongation. Avoid concomitant use of strong and moderate CYP3A inhibitors with RETEVMO. If concomitant use of strong and moderate CYP3A inhibitors cannot be avoided, reduce the RETEVMO dosage and monitor the QT interval with ECGs more frequently [see Dosage and Administration ( 2.6 ), Warnings and Precautions ( 5.4 )] . Strong and Moderate CYP3A Inducers Concomitant use of RETEVMO with a strong or moderate CYP3A inducer decreases selpercatinib plasma concentrations [see Clinical Pharmacology ( 12.3 )] , which may reduce RETEVMO anti-tumor activity. Avoid coadministration of strong or moderate CYP3A inducers with RETEVMO. 7.2 Effects of RETEVMO on Other Drugs CYP2C8 and CYP3A Substrates RETEVMO is a moderate CYP2C8 inhibitor and a weak CYP3A inhibitor. Concomitant use of RETEVMO with CYP2C8 and CYP3A substrates increases their plasma concentrations [see Clinical Pharmacology ( 12.3 )] , which may increase the risk of adverse reactions related to these substrates. Avoid coadministration of RETEVMO with CYP2C8 and CYP3A substrates where minimal concentration changes may lead to increased adverse reactions. If coadministration cannot be avoided, follow recommendations for CYP2C8 and CYP3A substrates provided in their approved product labeling. Certain P-gp and BCRP Substrates RETEVMO is a P-gp and BCRP inhibitor. Concomitant use of RETEVMO with P-gp or BCRP substrates increases their plasma concentrations [see Clinical Pharmacology ( 12.3 )] , which may increase the risk of adverse reactions related to these substrates. Avoid coadministration of RETEVMO with P-gp or BCRP substrates where minimal concentration changes may lead to increased adverse reactions. If coadministration cannot be avoided, follow recommendations for P-gp and BCRP substrates provided in their approved product labeling. 7.3 Drugs that Prolong QT Interval RETEVMO is associated with QTc interval prolongation [see Warnings and Precautions ( 5.4 ), Clinical Pharmacology ( 12.2 )] . Monitor the QT interval with ECGs more frequently in patients who require treatment with concomitant medications known to prolong the QT interval.

6 ADVERSE REACTIONS The following clinically significant adverse reactions are described elsewhere in the labeling: Hepatotoxicity [see Warnings and Precautions ( 5.1 )] Interstitial Lung Disease / Pneumonitis [see Warnings and Precautions ( 5.2 )] Hypertension [see Warnings and Precautions ( 5.3 )] QT Interval Prolongation [see Warnings and Precautions ( 5.4 )] Hemorrhagic Events [see Warnings and Precautions ( 5.5 )] Hypersensitivity [see Warnings and Precautions ( 5.6 )] Tumor Lysis Syndrome [see Warnings and Precautions ( 5.7 )] Risk of Impaired Wound Healing [see Warnings and Precautions ( 5.8 )] Hypothyroidism [see Warnings and Precautions ( 5.9 )] Slipped Capital Femoral Epiphysis/Slipped Upper Femoral Epiphysis in Adolescent Patients [see Warnings and Precautions ( 5.11 )] The most common adverse reactions (≥25%) include: Adult patients with solid tumors: musculoskeletal pain, edema, diarrhea, fatigue, dry mouth, hypertension, abdominal pain, rash, nausea, constipation, cough, headache, vomiting, dyspnea, and hemorrhage. ( 6 ) Pediatric patients with solid tumors : musculoskeletal pain, diarrhea, nausea, hemorrhage, pyrexia, abdominal pain, headache, vomiting, fatigue, cough, rash, coronavirus infection, upper respiratory tract infection, and edema. ( 6 ) The most common Grade 3 or 4 laboratory abnormalities (≥5%) include: Adult patients with solid tumors: decreased lymphocytes, increased alanine aminotransferase (ALT), decreased sodium, increased aspartate aminotransferase (AST), decreased calcium, and decreased phosphate. ( 6 ) Pediatric patients with solid tumors: decreased lymphocytes, decreased calcium, decreased hemoglobin, decreased neutrophils, increased alanine aminotransferase, decreased magnesium, and decreased potassium. ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Eli Lilly and Company at 1-800-LillyRx (1-800-545-5979) or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. The safety population described in the WARNINGS and PRECAUTIONS and below reflects exposure to RETEVMO as a single agent administered at 160 mg orally twice daily evaluated in 857 patients with advanced solid tumors in LIBRETTO-001 [see Clinical Studies ( 14 )] . RET Gene Fusion or Gene Mutation Positive Solid Tumors LIBRETTO-001 Among the 857 patients who received RETEVMO, 74% were exposed for 12 months or longer and 57% were exposed for 24 months or longer. Among these patients, 97% received at least one dose of RETEVMO at the recommended dosage of 160 mg orally twice daily. The median age was 59 years (range: 15 to 92 years); 0.2% were pediatric patients 12 to 16 years of age; 51% were male; and 68% were White, 24% were Asian, and 3% were Black or African American; and 5% were Hispanic/Latino. The most common tumors were NSCLC (43%), MTC (39%), and non-medullary thyroid carcinoma (8%). Serious adverse reactions occurred in 58% of patients who received RETEVMO. The most frequent serious adverse reactions (≥2% of patients) were pneumonia, hemorrhage, abdominal pain, dyspnea, pleural effusion, sepsis, musculoskeletal pain, hyponatremia, vomiting, diarrhea, and increased blood creatinine. Fatal adverse reactions occurred in 3% of patients; fatal adverse reactions included sepsis (n = 6), respiratory failure (n = 5), hemorrhage (n = 4), pneumonia (n = 4), cardiac arrest (n=3), pneumonitis, cardiac failure (n=2 each), sudden death, cerebral infarction and dyspnea (n = 1 each). Permanent discontinuation due to an adverse reaction occurred in 10% of patients who received RETEVMO. Adverse reactions resulting in permanent discontinuation in ≥0.5% of patients included increased ALT (0.7%), fatigue (0.6%), sepsis (0.5%), pneumonia (0.5%), and increased AST (0.5%). Dosage interruptions due to an adverse reaction occurred in 72% of patients who received RETEVMO. Adverse reactions requiring dosage interruption in ≥5% of patients included increased ALT, increased AST, diarrhea, hypertension, and QT prolongation. Dose reductions due to an adverse reaction occurred in 45% of patients who received RETEVMO. Adverse reactions requiring dosage reductions in ≥2% of patients included increased ALT, increased AST, fatigue, QT prolongation, diarrhea, drug hypersensitivity, and ascites. The most common adverse reactions (≥25%) were musculoskeletal pain, edema, diarrhea, fatigue, dry mouth, hypertension, abdominal pain, rash, nausea, constipation, headache, vomiting, cough, dyspnea, and hemorrhage. The most common Grade 3 or 4 laboratory abnormalities (≥5%) were decreased lymphocytes, increased alanine aminotransferase (ALT), decreased sodium, increased aspartate aminotransferase (AST), decreased calcium, and decreased phosphate. Table 6 summarizes the adverse reactions in LIBRETTO-001. Table 6: Adverse Reactions (≥20%) in Patients Who Received RETEVMO in LIBRETTO-001 Adverse Reaction RETEVMO (n = 857) Grades 1-4 # (%) Grades 3-4 (%) 1 Musculoskeletal pain includes back pain, arthralgia, pain in extremity, myalgia, musculoskeletal pain, neck pain, musculoskeletal chest pain, non-cardiac chest pain, bone pain, musculoskeletal stiffness, spinal pain. 2 Edema includes edema peripheral, face edema, periorbital edema, eye edema, eyelid edema, orbital edema, localized edema, lymphedema, scrotal edema, peripheral swelling, scrotal swelling, swelling, swelling face, eye swelling, generalized edema, genital edema, angioedema, penile edema, skin edema, testicular swelling, vulvovaginal swelling 3 Fatigue includes asthenia, malaise. 4 Diarrhea includes defecation urgency, frequent bowel movements, gastrointestinal hypermotility, anal incontinence. 5 Dry mouth includes mucosal dryness 6 Abdominal pain includes abdominal pain upper, abdominal pain lower, abdominal discomfort, abdominal tenderness, epigastric discomfort, gastrointestinal pain. 7 Vomiting includes regurgitation, retching. 8 Hypertension includes blood pressure increased 9 Rash includes skin exfoliation, rash erythematous, rash macular, rash maculopapular, rash morbilliform, rash papular, rash pruritic, butterfly rash, exfoliative rash, rash follicular, rash generalized, rash vesicular, dermatitis, urticaria, dermatitis allergic, rash pustular. 10 Cough includes productive cough, upper airway cough syndrome 11 Dyspnea includes dyspnea exertional, dyspnea at rest 12 Headache includes sinus headache, tension headache. 13 Dizziness includes vertigo, presyncope, dizziness postural. 14 Hemorrhage includes epistaxis, hematuria, hemoptysis, contusion, rectal hemorrhage, vaginal hemorrhage, ecchymosis, hematochezia, international normalized ratio increased, petechiae, traumatic hematoma, anal hemorrhage, blood blister, blood urine present, cerebral hemorrhage, hematocrit decreased, gastric hemorrhage, hemorrhage intracranial, hemorrhage subcutaneous, spontaneous hematoma, abdominal wall hematoma, angina bullosa hemorrhagica, arterial hemorrhage, coagulopathy, conjunctival hemorrhage, disseminated intravascular coagulation, diverticulum intestinal hemorrhagic, eye contusion, eye hematoma, eye hemorrhage, gastrointestinal hemorrhage, gingival bleeding, hematemesis, hemorrhagic stroke, hemothorax, hemorrhoidal hemorrhage, hepatic hemorrhage, menorrhagia, hepatic hematoma, intraabdominal hemorrhage, laryngeal hemorrhage, lower gastrointestinal hemorrhage, melena, mouth hemorrhage, occult blood positive, esophageal hemorrhage, post procedural hemorrhage, postmenopausal hemorrhage, pulmonary hemorrhage, pelvic hematoma, periorbital hematoma, periorbital hemorrhage, pharyngeal hemorrhage, pulmonary contusion, purpura, activated partial thromboplastin time prolonged, retinal hemorrhage, retroperitoneal hematoma, scleral hemorrhage, skin hemorrhage, subarachnoid hemorrhage, subdural hemorrhage, subdural hematoma, testicular hemorrhage, tracheal hemorrhage, traumatic hemothorax, tumor hemorrhage, upper gastrointestinal hemorrhage, uterine hemorrhage, vessel puncture site hematoma. 15 Prolonged QT interval includes electrocardiogram QT prolonged, electrocardiogram QT interval abnormal. * Only includes a grade 3 adverse reaction. # Graded according to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) version 4.03 Musculoskeletal and Connective Tissue Disorders Musculoskeletal pain 1 59 4.1* General Disorders and Administration Site Conditions Edema 2 53 1.3* Fatigue 3 49 4.7* Gastrointestinal Disorders Diarrhea 4 52 6.2* Dry mouth 5 44 0 Abdominal pain 6 39 3.5* Nausea 36 1.9* Constipation 35 0.8* Vomiting 7 29 2.9* Vascular Disorders Hypertension 8 43 20 Skin and Subcutaneous Tissue Disorders Rash 9 38 0.8* Respiratory, Thoracic and Mediastinal Disorders Cough 10 30 0 Dyspnea 11 28 4.1 Nervous System Disorders Headache 12 30 1.8* Dizziness 13 22 0.5* Blood and Lymphatic System Disorders Hemorrhage 14 26 3.9 Metabolism and Nutrition Disorders Decreased appetite 23 0.9* Investigations Prolonged QT interval 15 21 5* Infections and Infestations Urinary tract infection 20 2.2 * Clinically relevant adverse reactions in ≤15% of patients who received RETEVMO include hypothyroidism (15%); pneumonia (14%), hypersensitivity (6%); interstitial lung disease/pneumonitis, chylothorax, chylous ascites or tumor lysis syndrome (all < 3%). Table 7 summarizes the laboratory abnormalities in LIBRETTO-001. Table 7: Select Laboratory Abnormalities (≥20%) Worsening from Baseline in Patients Who Received RETEVMO in LIBRETTO-001 1 Denominator for each laboratory parameter is based on the number of patients with a baseline and post-treatment laboratory value available, which ranged from 823 to 855 patients. # Graded according to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) version 4.03 Laboratory Abnormality RETEVMO 1 Grades 1-4 # (%) Grades 3-4 (%) Chemistry Increased AST 62 11 Decreased calcium 61 7 Decreased albumin 61 3.6 Increased ALT 58 13 Increased glucose 56 4.0 Increased creatinine 51 3.6 Decreased sodium 49 13 Increased alkaline phosphatase 43 4.4 Increased potassium 39 3.5 Decreased glucose 39 1.5 Increased total cholesterol 37 1.7 Decreased magnesium 37 0.7 Increased bilirubin 32 2.9 Decreased phosphate 25 5 Hematology Decreased lymphocytes 56 22 Decreased platelets 41 4.0 Decreased hemoglobin 36 4.1 Decreased neutrophils 27 3.8 LIBRETTO-121 The safety population described below reflects exposure to RETEVMO as a single agent at 92 mg/m 2 orally twice daily evaluated in 36 patients with advanced solid tumors harboring an activating RET alteration in LIBRETTO-121 [see Clinical Studies ( 14 )] . Among the 36 pediatric and adolescent patients who received RETEVMO, 86% were exposed for 6 months or longer and 72% were exposed for greater than one year. The median age was 13 years (range: 2 to 20 years); 31% were pediatric patients 2 to 12 years of age; 53% were male; and 47% were White, 28% were Asian, and 8% were Black or African American; and 19% were Hispanic/Latino. The most common cancers were MTC (42%), and papillary thyroid cancer (42%). Serious adverse reactions occurred in 42% of patients who received RETEVMO. Serious adverse reactions occurring in more than 1 patient were vomiting and fracture (2 patients each). Dosage interruptions due to an adverse reaction occurred in 42% of patients who received RETEVMO. Adverse reactions requiring dosage interruption in ≥5% of patients included increased ALT, increased AST, ascites, increased bilirubin, decreased neutrophils, and pyrexia. Dose reductions due to an adverse reaction occurred in 22% of patients who received RETEVMO. Adverse reactions requiring dosage reductions in ≥2% of patients included increased ALT, decreased neutrophils, increased weight, and increased bilirubin. The most common adverse reactions (≥25%) were musculoskeletal pain, diarrhea, nausea, hemorrhage, pyrexia, abdominal pain, headache, vomiting, fatigue, cough, rash, coronavirus infection, upper respiratory tract infection, and edema. The most common Grade 3 or 4 laboratory abnormalities (≥5%) were decreased lymphocytes, decreased calcium, decreased hemoglobin, decreased neutrophils, increased ALT, decreased magnesium, and decreased potassium. Table 8 summarizes the adverse reactions in LIBRETTO-121. Table 8: Adverse Reactions (≥15%) in Patients Who Received RETEVMO in LIBRETTO-121 Adverse Reactions RETEVMO N= 36 Grades 1-4 # % Grades 3-4 % 1 Musculoskeletal pain includes arthralgia, back pain, bone pain, musculoskeletal chest pain, non-cardiac chest pain, neck pain, pain in extremity 2 Diarrhea includes anal incontinence 3 Abdominal pain includes abdominal pain upper, abdominal discomfort 4 Hemorrhage includes epistaxis, hematuria, anal hemorrhage, blood urine present, hemoptysis, menorrhagia, mouth hemorrhage 5 Fatigue includes asthenia, malaise 6 Edema includes face edema, edema peripheral, periorbital edema, localized edema, generalized edema, gastrointestinal edema, swelling 7 Rash includes rash maculopapular, rash erythematous, urticaria 8 Urinary tract infection includes cystitis 9 Hypothyroidism includes blood thyroid stimulating hormone increased, thyroglobulin increased * No Grade 4 events were reported. # Graded according to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) version 5.0. Musculoskeletal and Connective Tissue Disorders Musculoskeletal pain 1 58 0 Gastrointestinal Disorders Diarrhea 2 47 2.8* Nausea 42 2.8* Abdominal pain 3 36 0 Vomiting 31 8* Constipation 22 6 * Blood and Lymphatic System Disorders Hemorrhage 4 39 0 General Disorders and Administration Site Conditions Pyrexia 39 0 Fatigue 5 31 0 Edema 6 25 0 Nervous System Disorders Headache 33 0 Respiratory, Thoracic and Mediastinal Disorders Cough 31 0 Oropharyngeal pain 22 0 Skin and Subcutaneous Tissue Disorders Rash 7 28 0 Infections and Infestations Coronavirus infection 28 0 Upper respiratory tract infection 28 2.8* Urinary tract infection 8 19 2.8* Endocrine Disorders Hypothyroidism 9 22 0 Investigations Increased weight 19 11* Clinically relevant adverse reactions in <15% of patients who received RETEVMO include dizziness (14%), electrocardiogram QT prolonged (14%), hypersensitivity (11%), stomatitis (14%), proteinuria (11%), hypertension (8%), decreased appetite (8%), erectile dysfunction (6%), chylous ascites (2.8%), dry mouth (2.8%), epiphysiolysis (2.8%), and pneumonia (2.8%). Table 9 summarizes the laboratory abnormalities in LIBRETTO-121. Table 9: Select Laboratory Abnormalities (≥15%) Worsening from Baseline in Patients Who Received RETEVMO in LIBRETTO-121 1 Denominator for each laboratory parameter is based on the number of patients with a baseline and post-treatment laboratory value available, which ranged from 18 to 36 patients. * No Grade 4 abnormalities were reported. # Graded according to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) version 5.0. Laboratory Abnormality RETEVMO 1 Grades 1-4 # (%) Grades 3-4 (%) Chemistry Decreased calcium 61 11 Increased ALT 58 8* Decreased albumin 53 0 Increased alkaline phosphatase 50 0 Increased AST 50 2.8* Increased bilirubin 31 2.8* Increased cholesterol 28 0 Decreased magnesium 28 6 Increased potassium 28 2.8 Increased creatinine 19 2.8 Decreased potassium 19 6 Decreased sodium 17 0 Hematology Decreased neutrophils 40 8 Decreased hemoglobin 36 11* Increased hemoglobin 33 2.8* Decreased platelets 28 2.8* Decreased lymphocytes 28 14 Treatment-naïve RET Fusion-Positive Non-Small Cell Lung Cancer LIBRETTO-431 The safety population described below reflects exposure to RETEVMO as a single agent administered at 160 mg orally twice daily evaluated in 158 patients with unresectable locally advanced or metastatic RET fusion-positive NSCLC in LIBRETTO-431 [see Clinical Studies ( 14 )]. Among the 158 patients who received RETEVMO, the median duration of exposure was 16.7 months (range: 5 days to 37.9 months); 87% were exposed for 6 months or longer and 70% were exposed for one year or longer. The median age was 61 years (range: 31 to 87 years); 46% were male; and 36% were White, 58% were Asian, 1.3% were Black or African American, 1.3% were American Indian or Alaska Native, and 3.2% were missing. Serious adverse reactions occurred in 35% of patients who received RETEVMO. The most frequent serious adverse reactions (≥2% of patients) were pleural effusion, and abnormal hepatic function. Fatal adverse reactions occurred in 4.4% of patients who received RETEVMO; fatal adverse reactions included myocardial infarction (n = 2), respiratory failure (n = 2), cardiac arrest, malnutrition, and sudden death (n = 1, each). Permanent discontinuation due to an adverse reaction occurred in 10% of patients who received RETEVMO. Adverse reactions resulting in permanent discontinuation in ≥1% of patients included increased ALT (1.3%), and myocardial infarction (1.3%). Dosage interruptions due to an adverse reaction occurred in 72% of patients who received RETEVMO. Adverse reactions requiring dosage interruption in ≥5% of patients included increased ALT, hypertension, increased AST, QT prolongation, diarrhea, and COVID-19 infection. Dose reductions due to an adverse reaction occurred in 51% of patients who received RETEVMO. Adverse reactions requiring dose reductions in ≥5% of patients included increased ALT, increased AST, QT prolongation. The most common adverse reactions (≥25%) in patients who received RETEVMO were hypertension, diarrhea, edema, dry mouth, rash, fatigue, abdominal pain, and musculoskeletal pain. The most common Grade 3 or 4 laboratory abnormalities (≥5%) in patients who received RETEVMO were increased ALT, increased AST, and decreased lymphocytes. Table 10 summarizes the adverse reactions in LIBRETTO-431. Table 10: Adverse Reactions (≥15%) in Patients on Either Arm in LIBRETTO-431 1 Diarrhea includes diarrhea, anal incontinence. 2 Dry mouth includes dry mouth, mucosal dryness. 3 Abdominal pain includes abdominal pain, abdominal pain upper, abdominal discomfort, abdominal pain lower, gastrointestinal pain. 4 Stomatitis includes stomatitis, mouth ulceration, mucosal inflammation. 5 Vomiting includes vomiting, retching, regurgitation. 6 Edema includes edema, edema peripheral, face edema, periorbital edema, swelling face, peripheral swelling, localized edema, eyelid edema, orbital edema, eye edema, scrotal edema, penile edema, orbital swelling, periorbital swelling. 7 Fatigue includes fatigue, asthenia, malaise. 8 Rash includes rash, rash maculopapular, skin exfoliation, rash erythematous, rash macular, dermatitis, urticaria, rash papular, dermatitis allergic, rash pustular, rash vesicular, genital rash. 9 Musculoskeletal pain includes musculoskeletal pain, arthralgia, back pain, bone pain, musculoskeletal chest pain, non-cardiac chest pain, neck pain, pain in extremity. * No Grade 4 abnormalities were reported. # Graded according to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) version 5.0. Adverse Reaction RETEVMO (n=158) Chemotherapy with or without pembrolizumab (n=98) Grades 1-4 # (%) Grades 3-4 (%) Grades 1-4 # (%) Grades 3-4 (%) Vascular disorders Hypertension 48 20* 7 3.1* Gastrointestinal disorders Diarrhea 1 44 1.3* 24 2.0* Dry mouth 2 39 0 6 0 Abdominal pain 3 25 0.6* 19 2.0* Constipation 22 0 40 1.0* Stomatitis 4 18 0 16 0 Nausea 13 0 44 1.0* Vomiting 5 13 0 23 1.0* General disorders and administration site conditions Edema 6 41 2.5* 28 0 Fatigue 7 32 3.2* 50 5* Pyrexia 13 0.6* 23 0 Skin and subcutaneous tissue disorders Rash 8 33 1.9* 30 1.0* Musculoskeletal and Connective Tissue Disorders Musculoskeletal pain 9 25 0 28 0 Investigations Electrocardiogram QT prolonged 20 9* 1.0 0 Infections and infestations COVID-19 infection 19 0.6* 18 0 Metabolism and nutrition disorders Decreased appetite 17 0 34 2.0* Clinically relevant adverse reactions in <15% of patients who received RETEVMO include headache (14%); hemorrhage (13%); urinary tract infections (12%); hypothyroidism (9%); pneumonia (9%); dizziness (8%); interstitial lung disease/pneumonitis (4.4%); hypersensitivity, chylous ascites, and chylothorax (all < 2%). Table 11 summarizes the laboratory abnormalities in LIBRETTO-431. Table 11: Select Laboratory Abnormalities (≥20%) Worsening from Baseline in Patients on Either Arm in LIBRETTO-431 Laboratory Abnormality 1 RETEVMO Chemotherapy with or without pembrolizumab Grades 1-4 # (%) Grades 3-4 (%) Grades 1-4 # (%) Grades 3-4 (%) 1 Denominator for each laboratory parameter is based on the number of patients with a baseline and post-treatment laboratory value available: RETEVMO (range: 154 to 157 patients) and chemotherapy with or without pembrolizumab (range: 96 to 97 patients). # Graded according to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) version 5.0. Chemistry ALT increased 81 21 63 4.1 AST increased 77 10 46 0 Alkaline phosphatase Increased 35 1.3 22 0 Total bilirubin Increased 52 1.3 9 0 Blood creatinine Increased 23 0 21 0 Magnesium decreased 16 0.6 8 0 Albumin decreased 25 0 5 0 Calcium decreased 53 1.9 24 1.0 Sodium decreased 31 3.2 41 2.1 Potassium decreased 17 1.3 15 1.0 Hematology Platelets decreased 53 3.2 39 5 Lymphocyte count decreased 53 8 64 15 Hemoglobin decreased 21 0 91 5 Neutrophil count decreased 53 2.0 58 11 Increased Creatinine In healthy subjects administered RETEVMO 160 mg orally twice daily, serum creatinine increased 18% after 10 days. Consider alternative markers of renal function if persistent elevations in serum creatinine are observed [see Clinical Pharmacology ( 12.3 )] . RET-Mutant Medullary Thyroid Cancer LIBRETTO-531 The safety population described below reflects exposure to RETEVMO as a single agent administered at 160 mg (adults) or at 92 mg/m 2 (adolescent, not to exceed 160 mg) orally twice daily, in patients with progressive, advanced, kinase inhibitor naïve, RET -mutant medullary thyroid cancer in LIBRETTO-531 [see Clinical Studies ( 14.2 )]. Among the 193 patients who received RETEVMO, the observed median duration of exposure was 14.5 months (range: 25 days to 36 months); 80% were exposed for 6 months or longer and 59% were exposed for one year or longer. The median age was 55 years (range: 12 to 84 years); 63% were male; and 69% were White, 28% were Asian, 2.9% were Black or African American and ethnicity was not routinely collected. Serious adverse reactions occurred in 22% of patients who received RETEVMO. The most frequent serious adverse reactions were pneumonia and pyrexia (n = 3, each) and hypertension and urinary tract infection (n = 2, each). Fatal adverse reactions occurred in 2.1% of patients; fatal adverse reactions included COVID-19, diabetic ketoacidosis, multiple organ dysfunction syndrome, and sudden death (n=1 each). Permanent discontinuation due to an adverse reaction occurred in 4.7% of patients who received RETEVMO. Adverse reactions resulting in permanent discontinuation were edema, multiple organ dysfunction syndrome, sudden death, AST increased, diabetic ketoacidosis, chronic kidney disease, retinopathy, COVID-19, and somatic symptom disorder (n = 1, each). Dosage interruptions due to an adverse reaction occurred in 49% of patients who received RETEVMO. Adverse reactions requiring dosage omission in ≥5% of patients included ALT increased (9%) and hypertension (7%). Dose reductions due to an adverse reaction occurred in 39% of patients who received RETEVMO. One adverse reaction, increased ALT (7%), required a dose reduction in ≥5% of patients. The most common adverse reactions (≥25%) in patients who received RETEVMO were hypertension, edema, dry mouth, fatigue, and diarrhea. The most common Grade 3 or 4 laboratory abnormalities (≥5%) in patients who received RETEVMO were decreased lymphocytes, increased ALT, decreased neutrophils, increased ALP, increased blood creatinine, decreased calcium, and increased AST. Table 12 summarizes the adverse reactions in LIBRETTO-531. Table 12: Adverse Reactions (≥10%) in Patients Who Received RETEVMO in LIBRETTO-531 1 Hypertension includes hypertension, blood pressure increased. 2 Edema includes edema peripheral, face edema, periorbital edema, swelling face, peripheral swelling, localized edema, eyelid edema, generalized edema, eye swelling, lymphoedema, orbital edema, eye edema, edema, edema genital, swelling, scrotal edema, scrotal swelling, angioedema, skin edema, testicular swelling, vulvovaginal swelling. 3 Fatigue includes fatigue, asthenia, malaise. 4 Dry mouth includes dry mouth, mucosal dryness. 5 Diarrhea includes diarrhea, anal incontinence, defecation urgency, frequent bowel movements, gastrointestinal hypermotility. 6 Abdominal pain includes abdominal pain, abdominal pain upper, abdominal discomfort, abdominal pain lower, gastrointestinal pain. 7 Stomatitis includes stomatitis, mouth ulceration, mucosal inflammation. 8 Headache includes headache, sinus headache, tension headache. 9 Rash includes rash, rash maculopapular, skin exfoliation, rash erythematous, rash macular, dermatitis, urticaria, rash pruritic, exfoliative rash, rash papular, dermatitis allergic, rash follicular, rash generalized, rash pustular, butterfly rash, rash morbilliform, rash vesicular. 10 Electrocardiogram QT prolongation includes electrocardiogram QT prolonged, electrocardiogram QT interval abnormal. 11 Hypothyroidism includes hypothyroidism, blood thyroid stimulating hormone increased. * Only includes a Grade 3 adverse reaction # Graded according to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI-CTCAE) Version 5.0. Adverse Reaction RETEVMO N = 193 Cabozantinib or Vandetanib N = 97 Grades 1-4 # (%) Grades 3-4 (%) Grades 1-4 # (%) Grades 3-4 (%) Vascular disorders Hypertension 1 43 19* 41 18* General disorders and administration-site conditions Edema 2 33 0 5 0 Fatigue 3 28 4.1* 47 9* Pyrexia 12 1.0* 2.1 0 Gastrointestinal disorders Dry mouth 4 32 0.5* 10 1.0* Diarrhea 5 26 3.1* 61 8* Abdominal pain 6 18 0.5* 21 2.1* Constipation 16 0 12 0 Stomatitis 7 14 0.5* 42 13* Nausea 10 1.0* 32 5* Nervous system disorders Headache 8 23 0.5* 21 0 Skin and subcutaneous tissue disorders Rash 9 19 1.6* 27 4.1* Reproductive system and breast disorders Erectile dysfunction 16 0 0 0 Investigations Electrocardiogram QT prolonged 10 14 4.7* 13 2.1* Metabolism and nutrition disorders Decreased appetite 12 0.5* 28 5* Endocrine disorders Hypothyroidism 11 11 0 21 0 Clinically relevant adverse reactions in ≤10% of patients who received RETEVMO include dizziness (8%); urinary tract infections (8%); vomiting (8%); pneumonia, interstitial lung disease/pneumonitis, chylous ascites, and hypersensitivity (all < 2%). Table 13 summarizes the laboratory abnormalities in LIBRETTO-531. Table 13: Select Laboratory Abnormalities (≥5%) Worsening from Baseline in Patients Who Received RETEVMO in LIBRETTO-531 Laboratory Abnormality RETEVMO 1 Cabozantinib or Vandetanib 1 Grades 1-4 # % Grades 3-4 % Grades 1-4 # % Grades 3-4 % 1 Denominator for each laboratory parameter is based on the number of patients with a baseline and post-treatment laboratory value available: RETEVMO (range: 183 to 191 patients) and chemotherapy with or without cabozantinib or vandetanib (range: 91 to 94 patients). * Only includes a Grade 3 laboratory abnormality # Graded according to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) version 5.0 Chemistry Calcium decreased 55 5 62 11 ALT increased 53 16 72 7* AST increased 47 5 68 3.2* Alkaline phosphatase increased 37 6 28 5 Total bilirubin increased 32 1.1 30 3.2* Blood creatinine increased 27 6 16 8 Sodium decreased 20 3.2* 16 0 Albumin decreased 11 1.1 7 0 Magnesium decreased 9 3.3 26 9 Potassium decreased 8 0 22 4.4* Hematology Lymphocyte count decreased 41 18 36 13 Neutrophil count decreased 33 14 42 19 Platelets decreased 28 1.1 34 1.1* Hemoglobin decreased 18 2.1* 23 2.1* Increased Creatinine In healthy subjects administered RETEVMO 160 mg orally twice daily, serum creatinine increased 18% after 10 days. Consider alternative markers of renal function if persistent elevations in serum creatinine are observed [see Clinical Pharmacology ( 12.3 )] . 6.2 Postmarketing Experience The following adverse reaction has been identified during post-approval use of RETEVMO. Because such reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Skin and subcutaneous tissue disorders: Stevens-Johnson Syndrome

8.1 Pregnancy Risk Summary Based on findings from animal studies, and its mechanism of action [see Clinical Pharmacology ( 12.1 )] , RETEVMO can cause fetal harm when administered to a pregnant woman. There are no available data on RETEVMO use in pregnant women to inform drug-associated risk. Administration of selpercatinib to pregnant rats during the period of organogenesis resulted in embryolethality and malformations at maternal exposures that were approximately equal to the human exposure at the clinical dose of 160 mg twice daily. Advise pregnant women of the potential risk to a fetus. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively. Data Animal Data Selpercatinib administration to pregnant rats during the period of organogenesis at oral doses ≥100 mg/kg [approximately 3.6 times the human exposure based on the area under the curve (AUC) at the clinical dose of 160 mg twice daily] resulted in 100% post-implantation loss. At the dose of 50 mg/kg [approximately equal to the human exposure (AUC) at the clinical dose of 160 mg twice daily], 6 of 8 females had 100% early resorptions; the remaining 2 females had high levels of early resorptions with only 3 viable fetuses across the 2 litters. All viable fetuses had decreased fetal body weight and malformations (2 with short tail and one with small snout and localized edema of the neck and thorax).