Taletrectinib

12.1 Mechanism of Action Taletrectinib is an inhibitor of tyrosine kinase ROS1, including ROS1 resistance mutations. Taletrectinib also showed inhibitory effects on tropomyosin receptor kinases (TRKs) TRKA, TRKB, and TRKC. Fusion proteins that include ROS1 domains can drive tumorigenic potential through hyperactivation of downstream signaling pathways leading to unconstrained cell proliferation. Taletrectinib inhibited growth of cancer cells expressing ROS1 fusion genes and mutations. In mice subcutaneously implanted with tumors harboring ROS1 fusions, including the G2032R mutation, administration of taletrectinib resulted in tumor growth inhibition. Taletrectinib had anticancer activity in an intracranial NSCLC xenograft model harboring a ROS1 fusion.

1 INDICATIONS AND USAGE IBTROZI ™ (taletrectinib) is indicated for the treatment of adult patients with locally advanced or metastatic ROS1 -positive non-small cell lung cancer (NSCLC) [see Dosage and Administration ( 2.1 )] . IBTROZI is a kinase inhibitor indicated for the treatment of adult patients with locally advanced or metastatic ROS1 -positive non-small cell lung cancer (NSCLC). ( 1 )

2 DOSAGE AND ADMINISTRATION Select patients for the treatment of locally advanced or metastatic NSCLC based on the presence of ROS1 rearrangement(s). ( 2.1 ) Recommended Dosage: 600 mg orally once daily on an empty stomach (no food intake at least 2 hours before and 2 hours after taking IBTROZI). ( 2.3 ) Continue treatment until disease progression or unacceptable toxicity. ( 2.3 ) 2.1 Patient Selection Select patients for the treatment of locally advanced or metastatic NSCLC with IBTROZI based on the presence of ROS1 rearrangement(s) in tumor specimens [see Clinical Studies ( 14.1 )] . An FDA-approved test to detect ROS1 rearrangement(s) for selecting patients for treatment with IBTROZI is not currently available. 2.2 Recommended Testing and Evaluation Before Initiating IBTROZI Before initiating IBTROZI, evaluate liver function tests (including ALT, AST, and bilirubin), electrolytes, ECG, and uric acid [see Warnings and Precautions ( 5.1 , 5.3 , 5.4 )]. 2.3 Recommended Dosage and Administration The recommended dosage of IBTROZI is 600 mg orally once daily on an empty stomach (no food intake at least 2 hours before and 2 hours after taking IBTROZI) [see Clinical Pharmacology ( 12.2 , 12.3 )] until disease progression or unacceptable toxicity. Take IBTROZI at approximately the same time each day. Swallow IBTROZI capsules whole. Do not open, chew, crush, or dissolve the capsule prior to swallowing. Avoid food or drink containing grapefruit during treatment with IBTROZI. Minimize sun exposure and use sun protection, including broad-spectrum sunscreen, during treatment with IBTROZI and for at least 5 days after discontinuation [see Adverse Reactions ( 6.1 )]. Missed Dose If a dose is missed, take the next dose at its scheduled time on the following day. Vomiting If vomiting occurs at any time after taking a dose, take the next dose at its scheduled time on the following day. 2.4 Dosage Modifications for Adverse Reactions The recommended dosage reductions for the management of adverse reactions are provided in Table 1 . Table 1: Recommended Dose Reductions for IBTROZI Adverse Reactions Dosage Reduction Recommended Dosage First Dose Reduction 400 mg once daily Second Dose Reduction 200 mg once daily Permanently discontinue IBTROZI capsules in patients unable to tolerate 200 mg once daily. The recommended dosage modifications of IBTROZI for the management of adverse reactions are provided in Table 2 . Table 2: Recommended Dosage Modifications for IBTROZI Adverse Reactions Adverse Reaction Severity* Dosage Modification Abbreviations: ALT = alanine aminotransferase; AST = aspartate aminotransferase; ULN = Upper limit of normal *Graded per National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE), version 5.0. Hepatotoxicity (Elevation of ALT or AST) [see Warnings and Precautions ( 5.1 )] Grade 3 (>5 - 20 × ULN) Withhold IBTROZI until recovery to Grade ≤1 or baseline. If resolved within 6 weeks, resume IBTROZI at a reduced dose level. If unresolved after 6 weeks, permanently discontinue IBTROZI. Recurrence: If resolved within 6 weeks, resume IBTROZI at a reduced dose level. If unresolved after 6 weeks, permanently discontinue IBTROZI. Grade 4 (>20 × ULN) Withhold IBTROZI until recovery to Grade ≤1 or baseline. If resolved within 6 weeks, resume IBTROZI at a reduced dose level. If unresolved after 6 weeks, permanently discontinue IBTROZI. Recurrence: Permanently discontinue IBTROZI. ALT or AST ≥3 × ULN with concurrent total bilirubin ≥2 × ULN (in the absence of cholestasis or hemolysis) Permanently discontinue IBTROZI. ILD/pneumonitis [see Warnings and Precautions ( 5.2 )] Grade 1 Withhold IBTROZI if ILD/pneumonitis occurs or is suspected until recovery to Grade 0 or baseline. If resolved within 6 weeks, resume IBTROZI at the same dose level. If unresolved after 6 weeks, permanently discontinue IBTROZI. Recurrence: Permanently discontinue IBTROZI. Grade 2 Withhold IBTROZI if ILD/pneumonitis occurs or is suspected until recovery to Grade 0 or baseline. If resolved within 6 weeks, resume IBTROZI at a reduced dose level. If unresolved after 6 weeks, permanently discontinue IBTROZI. Recurrence: Permanently discontinue IBTROZI. Grade 3 or 4 Permanently discontinue IBTROZI. QTc Interval Prolongation [see Warnings and Precautions ( 5.3 )] Grade 2 (QTc interval 481-500 msec) Withhold IBTROZI until recovery to Grade ≤1 or baseline. Correct electrolytes and/or change concomitant medications. Resume IBTROZI at same dose. Grade 3 (QTc interval ≥501 msec or QTc interval increase of >60 msec from baseline) Withhold IBTROZI until recovery to Grade ≤1 or baseline. Correct electrolytes and/or change concomitant medications. Resume IBTROZI at a reduced dose. Grade 4 (Torsade de pointes; polymorphic ventricular tachycardia; signs/symptoms of serious arrhythmia) Permanently discontinue IBTROZI. Hyperuricemia [see Warnings and Precautions ( 5.4 )] Grade 3 or 4 Withhold IBTROZI until improvement of signs or sympt

6 ADVERSE REACTIONS The following adverse reactions are discussed in greater detail in the WARNINGS AND PRECAUTIONS section: Hepatotoxicity [see Warnings and Precautions ( 5.1 )] Interstitial Lung Disease/Pneumonitis [see Warnings and Precautions ( 5.2 )] QTc Interval Prolongation [see Warnings and Precautions ( 5.3 )] Hyperuricemia [see Warnings and Precautions ( 5.4 )] Myalgia with Creatine Phosphokinase Elevation [see Warnings and Precautions ( 5.5 )] Skeletal fractures [see Warnings and Precautions ( 5.6 )] The most frequently reported adverse reactions (≥20%) were: diarrhea, nausea, vomiting, dizziness, rash, constipation, and fatigue. ( 6.1 ) The most frequently reported Grade 3 or 4 laboratory abnormalities (≥5%) were: increased ALT, increased AST, decreased neutrophils, and increased creatine phosphokinase. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Nuvation Bio Inc. at 1-844-688-4550 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 pooled safety population described in the WARNINGS AND PRECAUTIONS section and below reflects exposure to IBTROZI as a single agent at 600 mg orally once daily until disease progression or unacceptable toxicity in 352 patients with ROS1 -positive NSCLC (N=337) and other solid tumors (N=15). Among the 352 patients who received IBTROZI, 68% were exposed for at least 6 months, and 47% were exposed for greater than 1 year. In this pooled safety population, the most common (≥20%) adverse reactions were diarrhea, nausea, vomiting, dizziness, rash, constipation, and fatigue. The most common (≥2%) Grade 3 or 4 laboratory abnormalities were increased ALT, increased AST, decreased neutrophils, increased creatine phosphokinase, decreased lymphocytes, increased magnesium, decreased hemoglobin, and increased triglycerides. Locally Advanced or Metastatic ROS1-Positive NSCLC The safety of IBTROZI was evaluated in the TRUST-I and TRUST-II studies [see Clinical Studies ( 14.1 )]. Key eligibility criteria were histologically confirmed, locally advanced or metastatic, ROS1 -positive NSCLC, ECOG performance status ≤1, and measurable disease per RECIST v1.1. Patients received IBTROZI as a single agent at 600 mg orally once daily until disease progression or unacceptable toxicity. Among patients who received IBTROZI, 68% were exposed for 6 months or longer and 47% were exposed for greater than one year. The median age of patients who received IBTROZI was 56 years (range: 26 to 83); 56% female; 76% Asian, 15% White, 0.6% Black or African American, 8% unknown or other races; and 1.8% were of Hispanic or Latino ethnicity. Serious adverse reactions occurred in 31% of patients who received IBTROZI. Serious adverse reactions in ≥2% of patients included pneumonia (7%), pleural effusion (4.7%), and hepatotoxicity (2.4%). Fatal adverse reactions occurred in 18 (5%) patients who received IBTROZI, including pneumonia (2.4%), multiple organ dysfunction syndrome (0.6%), hepatotoxicity (0.6%), cardiac arrest (0.6%), cardiac failure (0.3%), cardiopulmonary failure (0.3%), respiratory failure (0.3%), and death not otherwise specified (0.3%). Permanent discontinuation of IBTROZI was required in 7% of patients due to adverse reactions. Adverse reactions resulting in permanent discontinuation of IBTROZI in ≥2 patients were pneumonia, ILD, and hepatotoxicity. Dosage interruptions of IBTROZI due to an adverse reaction occurred in 41% of patients. Adverse reactions which required dosage interruption in ≥5% of patients included increased AST and increased ALT. Dose reductions of IBTROZI due to an adverse reaction occurred in 29% of patients. Adverse reactions that required dosage reductions in ≥5% of patients included increased ALT and increased AST. Table 3 summarizes the adverse reactions in this population. Table 3: Adverse Reactions (≥15%) in Patients with ROS1-Positive NSCLC Who Received IBTROZI in TRUST-I and TRUST-II 1 Based on NCI CTCAE version 5.0 a Includes enterocolitis b Includes vertigo, and vertigo positional c Includes dysesthesia, hypoesthesia, neuralgia, paresthesia, and peripheral sensory neuropathy d Includes ageusia e Includes dermatitis, dermatitis acneiform, drug eruption, eczema, eyelid rash, palmar-plantar erythrodysesthesia syndrome, rash maculo-papular, rash papular, skin exfoliation, and drug reaction with eosinophilia and systemic symptoms (DRESS) f Includes asthenia g Includes productive cough Adverse Reaction 1 IBTROZI N=337 All Grades (%) Grade 3 or 4 (%) Gastrointestinal Disorders Diarrhea a 64 2.1 Nausea 47 1.5 Vomiting 43 1.5 Constipation 21 0 Nervous System Disorders Dizziness b 22 0.3 Peripheral neuropathy c 17 0.3 Dysgeusia d 15 0 Skin and Subcutaneous Tissue Rash e 22 1.

7 DRUG INTERACTIONS Strong and Moderate CYP3A inhibitors : Avoid concomitant use. ( 7.1 ) Strong and Moderate CYP3A inducers: Avoid concomitant use. ( 7.1 ) Gastric Acid Reducing Agents: Avoid concomitant use with proton pump inhibitors (PPIs) and H2 receptor antagonists. If an acid-reducing agent cannot be avoided, administer IBTROZI 2 hours before or 2 hours after taking a locally acting antacid. ( 7.1 ) Drugs That Prolong the QTc Interval: Avoid concomitant use. ( 7.2 ) 7.1 Effects of Other Drugs on IBTROZI Strong and Moderate CYP3A Inhibitors Avoid concomitant use with strong or moderate CYP3A inhibitors. Taletrectinib is a CYP3A substrate. Concomitant use of IBTROZI with a strong or moderate CYP3A inhibitor increases taletrectinib exposure [see Clinical Pharmacology ( 12.3 )] , which may increase the risk of IBTROZI adverse reactions. Strong and Moderate CYP3A Inducers Avoid concomitant use with strong or moderate CYP3A inducers. Concomitant use of IBTROZI with a strong or moderate CYP3A inducer decreases taletrectinib exposure [see Clinical Pharmacology ( 12.3 )] , which may reduce the effectiveness of IBTROZI. Gastric Acid Reducing Agents Avoid concomitant use with proton pump inhibitors (PPI) and H2 receptor antagonists. Administer locally acting antacids at least 2 hours before or 2 hours after taking IBTROZI [see Clinical Pharmacology ( 12.3 )]. Concomitant use of a proton pump inhibitor decreases taletrectinib exposure [see Clinical Pharmacology ( 12.3 )], which may reduce the effectiveness of IBTROZI. 7.2. Drugs That Prolong the QTc Interval Avoid concomitant use of IBTROZI with other drug(s) with a known potential to prolong the QTc interval, such as antiarrhythmic drugs. If concomitant use cannot be avoided, adjust the frequency of monitoring as recommended [see Warnings and Precautions ( 5.3 ), Clinical Pharmacology ( 12.2 )]. Withhold IBTROZI if the QTc interval is >500 msec or the change from baseline is >60 msec [see Dosage and Administration ( 2.4 )]. IBTROZI causes QTc interval prolongation [see Warnings and Precautions ( 5.3 ), Clinical Pharmacology ( 12.2 )] . Concomitant use of IBTROZI with other drugs known to prolong the QTc interval may increase the risk of QTc interval prolongation.