Gavreto Drug Information

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 pooled safety population in the WARNINGS AND PRECAUTIONS reflect exposure to GAVRETO as a single agent at 400 mg orally once daily in 540 patients in ARROW. Among 540 patients who received GAVRETO, 71% were exposed for 6 months or longer and 57% were exposed for greater than one year. The most common adverse reactions (≥ 25%) were musculoskeletal pain, constipation, hypertension, diarrhea, fatigue, edema, pyrexia, and cough.

The most common Grade 3-4 laboratory abnormalities (≥ 2%) were decreased lymphocytes, decreased neutrophils, decreased hemoglobin, decreased phosphate, decreased leukocytes, decreased sodium, increased aspartate aminotransferase (AST), increased alanine aminotransferase (ALT), decreased calcium (corrected), decreased platelets, increased alkaline phosphatase, increased potassium, decreased potassium and increased bilirubin. In addition to the 540 patients, certain subsections in the WARNINGS AND PRECAUTIONS describe adverse reactions observed with exposure to GAVRETO as a single agent in a randomized, open-label study, AcceleRET-Lung (NCT04222972), which enrolled 223 patients with RET-fusion positive locally advanced unresectable or metastatic NSCLC. RET Fusion-Positive Non-Small Cell Lung Cancer The safety of GAVRETO was evaluated as a single agent at 400 mg orally once daily in 281 patients with metastatic rearranged during transfection ( RET fusion-positive) non-small cell lung cancer (NSCLC) in ARROW. Among the 281 patients who received GAVRETO, 72% were exposed for 6 months or longer and 56% were exposed for ≥1 year. The median age was 60 years (range: 26 to 87 years); 54% were female, 46% were White, 46% were Asian, and 4% were Hispanic/Latino.

Serious adverse reactions occurred in 65% of patients who received GAVRETO. The most frequent serious adverse reactions (in ≥ 2% of patients) were pneumonia, anemia, pneumonitis, pyrexia, sepsis, urinary tract infection, coronavirus infection, pleural effusion, dyspnea, musculoskeletal pain, pulmonary embolism, and seizure. Fatal adverse reactions occurred in 7% of patients; fatal adverse reactions which occurred in > 1 patient included pneumonia (n=8), sepsis (n=3) and COVID (n=3). Permanent discontinuation due to an adverse reaction occurred in 20% of patients who received GAVRETO. Adverse reactions resulting in permanent discontinuation which occurred in ≥ 2% of patients included pneumonitis (3.2%), and pneumonia (2.8%). Dosage interruptions due to an adverse reaction occurred in 73% of patients who received GAVRETO. Adverse reactions requiring dosage interruption in ≥ 2% of patients included anemia, pneumonia, pneumonitis, neutropenia, hypertension, increased blood creatine phosphokinase, fatigue, pyrexia, increased aspartate aminotransferase (AST), increased alanine aminotransferase (ALT), coronavirus infection, diarrhea, hypophosphatemia, musculoskeletal pain, thrombocytopenia, dyspnea, hemorrhage, leukopenia, lymphopenia, edema, sepsis, and vomiting. Dose reductions due to adverse reactions occurred in 51% of patients who received GAVRETO. Adverse reactions requiring dosage reductions in ≥ 2% of patients included anemia, neutropenia, pneumonitis, increased blood creatine phosphokinase, leukopenia, hypertension, fatigue, pneumonia, and lymphopenia.

Table 5 summarizes the adverse reactions in patients with NSCLC in ARROW. Table 5: Adverse Reactions (≥ 15%) in RET Fusion-Positive NSCLC Patients Who Received GAVRETO in ARROW Adverse reaction GAVRETO N = 281 Grades 1 - 4 (%) Grades 3 or 4 (%) Gastrointestinal disorders Constipation 45

Diarrhea 30 2.5 Nausea 19 0 Dry mouth 17 0 General Disorders

and Administration Site Conditions Edema Includes the preferred terms: Edema, Swelling face, Peripheral swelling, Generalized oedema, Edema peripheral, Face edema, Periorbital edema, Eyelid edema, Swelling, Localized edema 44 0 Fatigue Includes the preferred terms: Fatigue, Asthenia 42

Pyrexia 29 0.7 Musculoskeletal and Connective Tissue Disorders Musculoskeletal pain Includes the

preferred terms: Myalgia, Arthralgia, Pain in extremity, Neck pain, Musculoskeletal pain, Back pain, Musculoskeletal chest pain, Bone pain, Musculoskeletal stiffness 44

Increased Blood Creatine Phosphokinase 19 9 Vascular Hypertension Includes the preferred terms

Hypertension, Blood pressure increased 38 18 Respiratory, thoracic and mediastinal disorders Cough Includes the preferred terms: Cough, Productive Cough, Upper-airway cough syndrome 36

Dyspnea 21 2.1 Infection and Infestations Pneumonia Includes the preferred terms: Pneumonia

Pneumocystis jirovecii pneumonia, Pneumonia cytomegaloviral, Atypical pneumonia, Lung infection, Pneumonia bacterial, Pneumonia hemophilus, Pneumonia influenzal, Pneumonia streptococcal, Pneumonia viral, Pneumonia pseudomonal 24 13 Urinary tract infection 16

Metabolism and Nutrition Disorders Decreased appetite 18 1.1 Nervous system disorders Taste

disorder Includes the preferred terms: Dysgeusia, Ageusia 17 0 Headache Includes the preferred terms: Headache, Tension Headache 15

Skin and subcutaneous tissue disorders Rash Includes the preferred terms: Rash, Rash

maculo-papular, Dermatitis acneiform, Erythema, Rash generalized, Rash papular, Rash macular, Rash erythematous 17 0 Clinically relevant adverse reactions occurring in < 15% of patients included pneumonitis (14%), vomiting (14%), abdominal pain (14%), and stomatitis (6%). Table 6 summarizes the laboratory abnormalities in ARROW. Table 6: Select Laboratory Abnormalities (≥ 20%) Worsening from Baseline in RET Fusion-Positive NSCLC Patients Who Received GAVRETO in ARROW Laboratory Abnormality GAVRETO N=281 Grades 1-4 (%) Grades 3-4 (%) Chemistry Increased AST 80

Increased

ALT 58

Decreased albumin 52 0 Decreased calcium (corrected) 50 1.8 Decreased phosphate 50

17 Increased creatinine 45

Increased Potassium 27 1.8 Decreased Magnesium 25 0 Increased Bilirubin 20 1.8

Hematology Decreased leukocytes 79 11 Decreased hemoglobin 78 18 Decreased lymphocytes 73 32 Decreased neutrophils 70 21 Decreased platelets 33 5 Clinically relevant laboratory abnormalities occurring in < 20% of patients who received GAVRETO included increased magnesium (14%). RET -altered Thyroid Cancer The safety of GAVRETO was evaluated as a single agent at 400 mg orally once daily in 138 patients with RET -altered Thyroid Cancer (including 19 patients with RET fusion-positive thyroid cancer) in ARROW. Among the 138 patients who received GAVRETO, 68% were exposed for 6 months or longer, and 40% were exposed for greater than one year. The median age was 59 years (range: 18 to 83 years); 36% were female, 74% were White, 17% were Asian, and 6% were Hispanic/Latino. Serious adverse reactions occurred in 39% of patients who received GAVRETO. The most frequent serious adverse reactions (in ≥ 2% of patients) were pneumonia, pneumonitis, urinary tract infection, pyrexia, fatigue, diarrhea, dizziness, anemia, hyponatremia, and ascites.

Fatal adverse reaction occurred in 2.2% of patients; fatal adverse reactions that occurred in > 1 patient included pneumonia (n=2). Permanent discontinuation due to an adverse reaction occurred in 9% of patients who received GAVRETO. Adverse reactions resulting in permanent discontinuation which occurred in > 1 patient included fatigue, pneumonia and anemia. Dosage interruptions due to an adverse reaction occurred in 67% of patients who received GAVRETO. Adverse reactions requiring dosage interruption in ≥ 2% of patients included neutropenia, hypertension, diarrhea, fatigue, pneumonitis, anemia, increased blood creatine phosphokinase, pneumonia, urinary tract infection, musculoskeletal pain, vomiting, pyrexia, increased AST, dyspnea, hypocalcemia, cough, thrombocytopenia, abdominal pain, increased blood creatinine, dizziness, headache, decreased lymphocyte count, stomatitis, and syncope. Dose reductions due to adverse reactions occurred in 44% of patients who received GAVRETO. Adverse reactions requiring dosage reductions in ≥ 2% of patients included neutropenia, anemia, hypertension, increased blood creatine phosphokinase, decreased lymphocyte count, pneumonitis, fatigue and thrombocytopenia.

Table 7 summarizes the adverse reactions occurring in RET -altered Thyroid Cancer Patients in ARROW. Table 7: Adverse Reactions (≥ 15%) in RET-altered Thyroid Cancer Patients Who Received GAVRETO in ARROW Adverse Reactions GAVRETO N=138 Grades 1-4 (%) Grades 3-4 (%) Musculoskeletal Musculoskeletal Pain Musculoskeletal Pain includes arthralgia, arthritis, back pain, bone pain, musculoskeletal chest pain, musculoskeletal pain, musculoskeletal stiffness, myalgia, neck pain, non-cardiac chest pain, pain in extremity, spinal pain 42

Only includes a Grade 3 adverse reaction Gastrointestinal Constipation 41 0.7 Diarrhea

Diarrhea includes colitis, diarrhea 34 5 Abdominal Pain Abdominal Pain includes abdominal discomfort, abdominal pain, abdominal pain upper, abdominal tenderness, epigastric discomfort 17

Dry mouth 17 0 Stomatitis Stomatitis includes mucosal inflammation, stomatitis, tongue ulceration

17

Nausea 17 0.7 Vascular Hypertension 40 21 General Fatigue Fatigue includes asthenia

fatigue 38 6 Edema Edema includes eyelid edema, face edema, edema, edema peripheral, periorbital edema 29 0 Pyrexia 22

Respiratory Cough Cough includes cough, productive cough, upper-airway cough syndrome 27 1.4

Dyspnea Dyspnea includes dyspnea, dyspnea exertional 22

Nervous System Headache Headache includes headache, migraine 24 0 Peripheral Neuropathy Peripheral

neuropathy includes dysaesthesia, hyperaesthesia, hypoaesthesia, neuralgia, neuropathy peripheral, paraesthesia, peripheral sensory neuropathy, polyneuropathy 20 0 Dizziness Dizziness includes dizziness, dizziness postural, vertigo 19

Dysgeusia Dysgeusia includes ageusia, dysgeusia 17 0 Skin and Subcutaneous Rash Rash

includes dermatitis, dermatitis acneiform, eczema, palmar-plantar, erythrodysaesthesia syndrome, rash, rash erythematous, rash macular, rash maculo-papular, rash papular, rash pustular 24 0 Metabolism and Nutrition Decreased Appetite 15 0 Clinically relevant adverse reactions in < 15% of patients who received GAVRETO included tumor lysis syndrome and increased creatine phosphokinase. Table 8 summarizes the laboratory abnormalities occurring in RET -altered Thyroid Cancer Patients in ARROW. Table 8: Select Laboratory Abnormalities (≥ 20%) Worsening from Baseline in RET-altered Thyroid Cancer Patients Who Received GAVRETO in ARROW Laboratory Abnormality GAVRETO N=138 Grades 1-4 (%) Grades 3-4 (%) Denominator for each laboratory parameter is based on the number of patients with a baseline and post-treatment laboratory value available, which ranged from 135 to 138 patients. Chemistry Decreased calcium (corrected) 70 9 Increased AST 69

Increased

ALT 43

Increased creatinine 41 0 Decreased albumin 41 1.5 Decreased sodium 28 2.2

Decreased phosphate 28 8 Decreased magnesium 27

Hematology Decreased lymphocytes 67 27 Decreased hemoglobin 63 13 Decreased neutrophils 59

16 Decreased platelets 31

Clinically relevant laboratory abnormalities in patients who received

GAVRETO included increased phosphate (40%). Other Clinical Trials Experience AcceleRET-Lung trial (NCT04222972) In AcceleRET-Lung trial (NCT04222972), single agent GAVRETO (n=108) was compared to chemotherapy/immunotherapy (n=104) in patients with RET fusion-positive NSCLC. Adverse reactions were infections (72% vs.52%), including pneumonia (29% vs. 6%), urinary tract infection (22% vs. 8%), and opportunistic infections (20% vs. 6%). Opportunistic infections included pneumocystis jirovecii pneumonia, fungal infections, legionella pneumonia, cytomegalovirus infection, and herpes simplex.

Effects of Other Drugs on

GAVRETO Strong or Moderate CYP3A and/or P-gp Inhibitors Concomitant use with a strong or moderate CYP3A inhibitor and/or a P-gp inhibitor increases pralsetinib exposure , which may increase the risk of adverse reactions related to GAVRETO. Avoid coadministration of GAVRETO with a strong or moderate CYP3A and/or P-gp inhibitor. If coadministration with any of the above inhibitors cannot be avoided, reduce the GAVRETO dose. Strong or Moderate CYP3A Inducers Concomitant use with a strong CYP3A inducer decreases pralsetinib exposure, which may decrease efficacy of GAVRETO. Avoid concomitant use of GAVRETO with strong or moderate CYP3A inducers.

If coadministration of GAVRETO with strong or moderate CYP3A inducers cannot be avoided, increase the GAVRETO dose

Pregnancy Risk Summary Based on findings from animal studies and its mechanism of action, GAVRETO can cause fetal harm when administered to a pregnant woman. There are no available data on GAVRETO use in pregnant women to inform drug-associated risk. Oral administration of pralsetinib to pregnant rats during the period of organogenesis resulted in malformations and embryolethality at maternal exposures below the human exposure at the clinical dose of 400 mg once daily (see Data ). 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 2-4% and 15-20%, respectively. Data Animal Data In an embryo-fetal development study, once daily oral administration of pralsetinib to pregnant rats during the period of organogenesis resulted in 100% post-implantation loss at dose levels ≥ 20 mg/kg (approximately 1.8 times the human exposure based on area under the curve at the clinical dose of 400 mg). Post-implantation loss also occurred at the 10 mg/kg dose level (approximately 0.6 times the human exposure based on AUC at the clinical dose of 400 mg). Once daily oral administration of pralsetinib at dose levels ≥ 5 mg/kg (approximately 0.2 times the human AUC at the clinical dose of 400 mg) resulted in an increase in visceral malformations and variations (absent or small kidney and ureter, absent uterine horn, malpositioned kidney or testis, retroesophageal aortic arch) and skeletal malformations and variations (vertebral and rib anomalies and reduced ossification).

Pediatric Use The safety and effectiveness of GAVRETO have been established in pediatric patients aged 12 years and older for RET fusion-positive thyroid cancer. Use of GAVRETO in this age group is supported by evidence from an adequate and well-controlled study of GAVRETO in adults with additional population pharmacokinetic data demonstrating that age and body weight had no clinically meaningful effect on the pharmacokinetics of pralsetinib, that the exposure of pralsetinib is expected to be similar between adults and pediatric patients age 12 years and older, and that the course of RET fusion-positive thyroid cancer is sufficiently similar in adults and pediatric patients to allow extrapolation of data in adults to pediatric patients. The safety and effectiveness of GAVRETO have not been established in pediatric patients with RET fusion-positive NSCLC or in pediatric patients younger than 12 years old with RET fusion-positive thyroid cancer.

Animal Toxicity Data In a 4-week repeat-dose toxicology study in non-human primates, physeal dysplasia in the femur occurred at doses resulting in exposures similar to the human exposure (AUC) at the clinical dose of 400 mg. In rats there were findings of increased physeal thickness in the femur and sternum as well as tooth (incisor) abnormalities (fractures, dentin matrix alteration, ameloblast/odontoblast degeneration, necrosis) in both 4- and 13-week studies at doses resulting in exposures similar to the human exposure (AUC) at the clinical dose of 400 mg. Recovery was not assessed in the 13-week toxicology study, but increased physeal thickness in the femur and incisor degeneration did not show evidence of complete recovery in the 28-day rat study.

Monitor growth plates in adolescent patients with open growth plates. Consider interrupting or discontinuing therapy based on the severity of any growth plate abnormalities and based on an individual risk-benefit assessment.