Avutometinib

12.1 Mechanism of Action Avutometinib Avutometinib is a MEK1 inhibitor. Avutometinib induces the formation of inactive RAF/MEK complexes and prevents phosphorylation of MEK1/2 by RAF. RAF and MEK proteins are regulators of the RAS/RAF/MEK/ERK (MAPK) pathway. Avutometinib inhibited MEK1/2 and ERK1/2 phosphorylation and proliferation of tumor cell lines harboring KRAS mutations. Treatment of cancer cells with avutometinib increased the level of phosphorylated focal adhesion kinase (FAK). Defactinib Defactinib is an inhibitor of FAK and proline-rich tyrosine kinase-2 (Pyk2), the two members of the FAK family of nonreceptor tyrosine kinases. Defactinib inhibited FAK autophosphorylation in cancer cells in vitro and in mouse xenograft models. Avutometinib in combination with defactinib enhanced inhibition of cell proliferation in vitro and anti-tumor activity in mouse tumor models including LGSOC.

1 INDICATIONS AND USAGE AVMAPKI FAKZYNJA CO-PACK is indicated for the treatment of adult patients with KRAS -mutated recurrent low-grade serous ovarian cancer (LGSOC) who have received prior systemic therapy. This indication is approved under accelerated approval based on tumor response rate and duration of response [see Clinical Studies (14) ]. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial. AVMAPKI FAKZYNJA CO-PACK, a combination of avutometinib and defactinib, each kinase inhibitors, is indicated for the treatment of adult patients with KRAS -mutated recurrent low-grade serous ovarian cancer (LGSOC) who have received prior systemic therapy. This indication is approved under accelerated approval based on tumor response rate and duration of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial. ( 1 , 14 )

2 DOSAGE AND ADMINISTRATION AVMAPKI 3.2 mg administered orally twice weekly (Day 1 and Day 4) for the first 3 weeks of each 4-week cycle. ( 2.3 ) FAKZYNJA 200 mg administered orally twice daily for the first 3 weeks of each 4-week cycle. ( 2.3 ) 2.1 Patient Selection Select patients for the treatment of recurrent LGSOC with AVMAPKI FAKZYNJA CO-PACK based on the presence of a KRAS mutation in tumor specimens [see Clinical Studies (14) ] . An FDA-approved test for the detection of a KRAS mutation in LGSOC for selecting patients for treatment with AVMAPKI FAKZYNJA CO-PACK is not available. 2.2 Eye Exams and Prophylactic Skin Medications Ophthalmic Exams Conduct a comprehensive ophthalmic exam at baseline, prior to cycle 2, and every three cycles thereafter regardless of baseline exam findings, and as clinically indicated [see Warnings and Precautions (5.1) ]. Prophylactic Medications for Skin Reactions With initiation of and during at least the first 2 cycles of AVMAPKI FAKZYNJA CO-PACK administer [see Warnings and Precautions (5.2) ] : Topical corticosteroid (applied to the face, scalp, neck, upper chest and upper back) Systemic oral antibiotics 2.3 Recommended Dosage and Administration AVMAPKI Capsules The recommended dosage of AVMAPKI capsules is 3.2 mg (four 0.8 mg capsules) taken orally twice weekly (Day 1 and Day 4) for the first 3 weeks of each 4-week cycle until disease progression or unacceptable toxicity. Take AVMAPKI at the same time with each dose. AVMAPKI should be taken with food [see Clinical Pharmacology (12.3) ] . Swallow capsules whole. Do not chew, break, or open the capsules. If a dose of AVMAPKI is missed by more than 24 hours, skip the missed dose and take the next scheduled dose as prescribed. Do not take two doses at the same time to make up for a missed dose. If vomiting occurs after taking AVMAPKI, do not take an additional dose. Take the next scheduled dose as prescribed. FAKZYNJA Tablets The recommended dosage of FAKZYNJA tablets is 200 mg (one tablet) taken orally twice daily for the first 3 weeks of each 4-week cycle until disease progression or unacceptable toxicity. Take each dose of FAKZYNJA with food [see Clinical Pharmacology (12.3) ] . Swallow tablets whole. Do not chew, break or crush the tablets. If a dose of FAKZYNJA is missed by more than 6 hours, skip the missed dose and take the next scheduled dose as prescribed. Do not take two tablets at the same time to make up for a missed dose. If vomiting occurs after taking FAKZYNJA, do not take an additional dose. Take the next scheduled dose as prescribed. 2.4 Dosage Modifications for Adverse Reactions Dose reductions due to adverse reactions due to AVMAPKI FAKZYNJA CO-PACK are summarized in Table 1. Table 1 Recommended Dose Reductions for Adverse Reactions Dose Level AVMAPKI Capsule FAKZYNJA Tablet Starting dose 3.2 mg twice weekly for first 3 weeks of each 4-week cycle 200 mg twice daily for first 3 weeks of each 4-week cycle Dose reduction 2.4 mg twice weekly for first 3 weeks of each 4-week cycle 200 mg once daily for first 3 weeks of each 4-week cycle Permanently discontinue both AVMAPKI and FAKZYNJA in patients unable to tolerate after one dose reduction of both products. Dosage modifications for adverse reactions to AVMAPKI FAKZYNJA CO-PACK are summarized in Table 2. Table 2 AVMAPKI FAKZYNJA CO-PACK Dosage Modifications Adverse Reaction Severity Severity as defined by National Center Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) version 5.0 Dose Modification N/A: Not applicable Keratitis [see Warnings and Precautions (5.1) ] Confluent superficial keratitis, a cornea epithelial defect, or 3-line or more loss in best corrected distance visual acuity Withhold AVMAPKI FAKZYNJA CO-PACK until resolved to nonconfluent superficial keratitis, then resume at same dose. Corneal ulcer or stromal opacity or best corrected distance visual acuity 20/200 or worse Corneal perforation Withhold AVMAPKI FAKZYNJA CO-PACK until resolved to nonconfluence superficial keratitis, then resume at reduced dose. Permanently discontinue AVMAPKI FAKZYNJA CO-PACK. Blurred vision [see Warnings and Precautions (5.1) ] BCVA worse than baseline but no worse than 20/200 Withhold AVMAPKI FAKZYNJA CO-PACK until resolution to baseline or 20/40, whichever is worse, then resume treatment at same dose. BCVA 20/200 or worse Withhold AVMAPKI FAKZYNJA CO-PACK until resolution to baseline or 20/40, whichever is worse, then resume at reduced dose. Conjunctivitis [see Warnings and Precautions (5.1) ] Confluent superficial punctate staining, moderate to severe vasodilation Withhold AVMAPKI FAKZYNJA CO-PACK until resolution to nonconfluent superficial keratitis, then resume at same dose. Conjunctival ulcer or neovascularization Withhold AVMAPKI FAKZYNJA CO-PACK until resolution to nonconfluent superficial keratitis, then resume at reduced dose. Retinal Pigment Epithelial (RPE) Detachment [see Warnings and Precautions (5.1) ] N/A First occurrence Re

6 ADVERSE REACTIONS The following adverse reactions are discussed in more detail in other sections of the labeling: Ocular Toxicities [see Warnings and Precautions (5.1) ] Serious Skin Toxicities [see Warnings and Precautions (5.2) ] Hepatotoxicity [see Warnings and Precautions (5.3) ] Rhabdomyolysis [see Warnings and Precautions (5.4) ] The most common (≥ 25%) adverse reactions, including laboratory abnormalities, were increased creatine phosphokinase, nausea, fatigue, increased aspartate aminotransferase, rash, diarrhea, musculoskeletal pain, edema, decreased hemoglobin, increased alanine aminotransferase, vomiting, increased blood bilirubin, increased triglycerides, decreased lymphocyte count, abdominal pain, dyspepsia, dermatitis acneiform, vitreoretinal disorders, increased alkaline phosphatase, stomatitis, pruritus, visual impairment, decreased platelet count, constipation, dry skin, dyspnea, cough, urinary tract infection, and decreased neutrophil count. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Verastem at 1-833-633-8786 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 Warnings and Precautions reflect exposure to the AVMAPKI FAKZYNJA CO-PACK (combination of AVMAPKI 3.2 mg twice weekly and FAKZYNJA 200 mg twice daily) for the first 3 weeks in a 4-week cycle until disease progression or unacceptable toxicity in 136 adult patients with recurrent LGSOC treated on RAMP-201 and FRAME (NCT03875820). The median duration of treatment was 10 months (range 0 to 51 months). RAMP-201 The safety of AVMAPKI FAKZYNJA CO-PACK was evaluated in RAMP-201, a single-arm multicenter trial in 57 patients with KRAS- mutated recurrent LGSOC [see Clinical Studies (14) ] . Patients received AVMAPKI FAKZYNJA CO-PACK (AVMAPKI 3.2 mg twice weekly and FAKZYNJA 200 mg twice daily) for the first 3 weeks in a 4-week cycle until disease progression or unacceptable toxicity. The median duration of treatment was 12 months (range 0.03-40). Serious adverse reactions occurred in 32% of patients who received AVMAPKI FAKZYNJA CO-PACK. The most common (≥2%) serious adverse reactions were sepsis (9%), intestinal obstruction (3.6%), pyelonephritis (3.6%), and hydronephrosis (3.6%). Fatal adverse reactions occurred in 3.6% of patients who received AVMAPKI FAKZYNJA CO-PACK, including intestinal obstruction (1.8%) and perforation (1.8%). Permanent discontinuation of AVMAPKI FAKZYNJA CO-PACK due to an adverse reaction occurred in 14% of patients. The adverse reactions leading to permanent discontinuation included elevations in creatine phosphokinase, dyspnea, malaise, decreased glomerular filtration rate, hyperbilirubinemia, increased alanine aminotransferase, and abdominal pain (1.8% each). Dosage interruptions of AVMAPKI FAKZYNJA CO-PACK due to an adverse reaction occurred in 84% of patients. Adverse reactions which required dosage interruptions in ≥ 5% of patients included elevations in creatine phosphokinase (25%), hyperbilirubinemia (25%), diarrhea (12%), edema (11%), fatigue (9%), vision blurred (9%), vitreoretinal disorders (7%), transaminitis (7%), paronychia (5%), nausea (5%), abdominal pain (5%), vomiting (5%), dyspnea (5%), sepsis (5%), and rash (5%). Dose reductions of AVMAPKI FAKZYNJA CO-PACK due to an adverse reaction occurred in 44% of patients. Adverse reactions which required dose reductions in ≥ 5% of patients were elevations in creatine phosphokinase (9%), fatigue (5%), hyperbilirubinemia (5%), and dermatitis acneiform (5%). The most common (≥25%) adverse reactions, including laboratory abnormalities, were increased creatine phosphokinase, nausea, fatigue, increased aspartate aminotransferase, rash, diarrhea, musculoskeletal pain, edema, decreased hemoglobin, increased alanine aminotransferase, vomiting, increased blood bilirubin, increased triglycerides, decreased lymphocyte count, abdominal pain, dyspepsia, dermatitis acneiform, vitreoretinal disorders, increased alkaline phosphatase, stomatitis, pruritus, visual impairment, decreased platelet count, constipation, dry skin, dyspnea, cough, urinary tract infection, and decreased neutrophil count. Table 3 summarizes the adverse reactions in RAMP-201. Table 3 Adverse Reactions (≥10%) in Patients with KRAS-Mutated Recurrent LGSOC who Received AVMAPKI FAKZYNJA CO-PACK in RAMP-201 Severity as defined by National Center Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) version 5.0. Adverse Reaction AVMAPKI FAKZYNJA CO-PACK N = 57 All Grades % Grade 3 or 4 No Grade 4 treatment-emergent adverse events occurred. % Gastrointestinal disorders Nausea 74 1.8 Diarrhea 68 7 Vomiting 49 3.5 Abdominal pain Includes multiple terms 39

7 DRUG INTERACTIONS Strong and moderate CYP3A4 inhibitors : Avoid concomitant use with AVMAPKI FAKZYNJA CO-PACK. ( 7.1 ) Strong and moderate CYP3A4 inducers : Avoid concomitant use with AVMAPKI FAKZYNJA CO-PACK. ( 7.1 ) Warfarin : Avoid concomitant use of AVMAPKI FAKZYNJA CO-PACK with warfarin and use an alternative to warfarin. ( 7.2 ) Gastric acid reducing agents : Avoid concomitant use of AVMAPKI FAKZYNJA CO-PACK with proton pump inhibitors (PPIs) or H2 receptor antagonists. If use of an acid-reducing agent cannot be avoided, administer FAKZYNJA 2 hours before or 2 hours after the administration of a locally acting antacid. ( 7.1 ) 7.1 Effect of Other Drugs on AVMAPKI FAKZYNJA CO-PACK Strong and Moderate CYP3A4 Inhibitors Avoid concomitant use of AVMAPKI FAKZYNJA CO-PACK with strong or moderate CYP3A4 inhibitors. Defactinib is a CYP3A4 substrate. Concomitant use of defactinib with a strong CYP3A4 inhibitor increases defactinib exposure [see Clinical Pharmacology (12.3) ], which may increase the risk of AVMAPKI FAKZYNJA CO-PACK adverse reactions. Strong and Moderate CYP3A4 Inducers Avoid concomitant use of AVMAPKI FAKZYNJA CO-PACK with strong or moderate CYP3A4 inducers. Defactinib is a CYP3A4 substrate. Concomitant use of defactinib with a strong CYP3A4 inducer decreases defactinib exposure, which may reduce the effectiveness of FAKZYNJA [see Clinical Pharmacology (12.3) ] . Gastric Acid Reducing Agents Avoid concomitant use of AVMAPKI FAKZYNJA CO-PACK with proton pump inhibitors (PPIs) or H2 receptor antagonists. If concomitant use of an acid-reducing agent cannot be avoided, administer FAKZYNJA 2 hours before or 2 hours after the administration of a locally acting antacid. Concomitant use of FAKZYNJA with gastric acid reducing agents decreases defactinib exposure, which may reduce the effectiveness of AVMAPKI FAKZYNJA CO-PACK [see Clinical Pharmacology (12.3) ] . 7.2 Effect of AVMAPKI FAKZYNJA CO-PACK on Other Drugs Warfarin Avoid concomitant use of AVMAPKI FAKZYNJA CO-PACK with warfarin. For patients requiring anticoagulation, an alternative to warfarin is recommended. If concomitant use is unavoidable, monitor INR frequently during treatment with AVMAPKI FAKZYNJA CO-PACK. Cases of bleeding and increased INR occurred in patients taking FAKZYNJA concomitantly with warfarin in clinical trials.