Cobimetinib

1 INDICATIONS AND USAGE COTELLIC ® is a kinase inhibitor indicated: For the treatment of adult patients with unresectable or metastatic melanoma with a BRAF V600E or V600K mutation, in combination with vemurafenib. ( 1.1 , 14.1 ) As a single agent for the treatment of adult patients with histiocytic neoplasms. ( 1.2 , 14.2 ) 1.1 Unresectable or Metastatic Melanoma COTELLIC ® is indicated for the treatment of adult patients with unresectable or metastatic melanoma with a BRAF V600E or V600K mutation, in combination with vemurafenib. 1.2 Histiocytic Neoplasms COTELLIC®, as a single agent, is indicated for the treatment of adult patients with histiocytic neoplasms.

12.1 Mechanism of Action Cobimetinib is a reversible inhibitor of mitogen-activated protein kinase (MAPK)/extracellular signal regulated kinase 1 (MEK1) and MEK2. MEK proteins are upstream regulators of the extracellular signal-related kinase (ERK) pathway, which promotes cellular proliferation. BRAF V600E and K mutations result in constitutive activation of the BRAF pathway which includes MEK1 and MEK2. In mice implanted with tumor cell lines expressing BRAF V600E, cobimetinib inhibited tumor cell growth. Cobimetinib and vemurafenib target two different kinases in the RAS/RAF/MEK/ERK pathway. Compared to either drug alone, coadministration of cobimetinib and vemurafenib resulted in increased apoptosis in vitro and reduced tumor growth in mouse implantation models of tumor cell lines harboring BRAF V600E mutations. Cobimetinib also prevented vemurafenib-mediated growth enhancement of a wild-type BRAF tumor cell line in an in vivo mouse implantation model.

2 DOSAGE AND ADMINISTRATION Confirm the presence of BRAF V600E or V600K mutation in tumor specimens prior to initiation of COTELLIC with vemurafenib for patients with melanoma. ( 2.1 ) The recommended dose is 60 mg orally once daily for the first 21 days of each 28-day cycle until disease progression or unacceptable toxicity. Take COTELLIC with or without food. ( 2.2 ) 2.1 Patient Selection for Treatment of Melanoma Confirm the presence of BRAF V600E or V600K mutation in tumor specimens prior to initiation of treatment with COTELLIC with vemurafenib. Information on FDA-approved tests for the detection of BRAF V600 mutations in melanoma is available at: http://www.fda.gov/CompanionDiagnostics . 2.2 Recommended Dosage The recommended dosage regimen of COTELLIC is 60 mg (three 20 mg tablets) orally taken once daily for the first 21 days of each 28-day cycle until disease progression or unacceptable toxicity [see Clinical Studies (14) ] . Take COTELLIC with or without food [see Clinical Pharmacology (12.3) ] . If a dose of COTELLIC is missed or if vomiting occurs when the dose is taken, resume dosing with the next scheduled dose. 2.3 Dose Modifications Concurrent CYP3A Inhibitors Do not take strong or moderate CYP3A inhibitors while taking COTELLIC. If concurrent short term (14 days or less) use of moderate CYP3A inhibitors is unavoidable for patients who are taking COTELLIC 60 mg, reduce COTELLIC dose to 20 mg. After discontinuation of a moderate CYP3A inhibitor, resume previous dose of COTELLIC 60 mg [see Drug Interactions (7.1) and Clinical Pharmacology (12.3) ] . Use an alternative to a strong or moderate CYP3A inhibitor in patients who are taking a reduced dose of COTELLIC (40 or 20 mg daily) [see Drug Interactions (7.1) and Clinical Pharmacology (12.3) ] . Adverse Reactions Review the Full Prescribing Information for vemurafenib for recommended dose modifications. Table 1. Recommended Dose Reductions for COTELLIC First Dose Reduction 40 mg orally once daily Second Dose Reduction 20 mg orally once daily Subsequent Modification Permanently discontinue COTELLIC if unable to tolerate 20 mg orally once daily Table 2. Recommended Dose Modifications for COTELLIC for Adverse Reactions Severity of Adverse Reaction National Cancer Institute Common Terminology Criteria for Adverse Events version 4.0 (NCI CTCAE v4.0) Dose Modification for COTELLIC New Primary Malignancies (cutaneous and non-cutaneous) No dose modification is required. Hemorrhage Grade 3 Withhold COTELLIC for up to 4 weeks. If improved to Grade 0 or 1, resume at the next lower dose level. If not improved within 4 weeks, permanently discontinue. Grade 4 Permanently discontinue. Cardiomyopathy Asymptomatic, absolute decrease in LVEF from baseline of greater than 10% and less than institutional lower limit of normal (LLN) Withhold COTELLIC for 2 weeks; repeat LVEF. Resume at next lower dose if all of the following are present: LVEF is at or above LLN and Absolute decrease from baseline LVEF is 10% or less. Permanently discontinue if any of the following are present: LVEF is less than LLN or Absolute decrease from baseline LVEF is more than 10%. Symptomatic LVEF decrease from baseline Withhold COTELLIC for up to 4 weeks, repeat LVEF. Resume at next lower dose if all of the following are present: Symptoms resolve and LVEF is at or above LLN and Absolute decrease from baseline LVEF is 10% or less. Permanently discontinue if any of the following are present: Symptoms persist, or LVEF is less than LLN, or Absolute decrease from baseline LVEF is more than 10%. Dermatologic Reactions Grade 2 (intolerable), Grade 3 or 4 Withhold or reduce dose. Serous Retinopathy or Retinal Vein Occlusion Serous retinopathy Withhold COTELLIC for up to 4 weeks. If signs and symptoms improve, resume at the next lower dose level. If not improved or symptoms recur at the lower dose within 4 weeks, permanently discontinue. Retinal vein occlusion Permanently discontinue COTELLIC. Liver Laboratory Abnorma

6 ADVERSE REACTIONS The following adverse reactions are discussed in greater detail in other sections of the label: New Primary Cutaneous Malignancies [see Warnings and Precautions (5.1) ] Hemorrhage [see Warnings and Precautions (5.2) ] Cardiomyopathy [see Warnings and Precautions (5.3) ] Serious Dermatologic Reactions [see Warnings and Precautions (5.4) ] Serous Retinopathy and Retinal Vein Occlusion [see Warnings and Precautions (5.5) ] Hepatotoxicity [see Warnings and Precautions (5.6) ] Rhabdomyolysis [see Warnings and Precautions (5.7) ] Severe Photosensitivity [see Warnings and Precautions (5.8) ] Unresectable or Metastatic Melanoma: Most common adverse reactions for COTELLIC (≥20%) are diarrhea, photosensitivity reaction, nausea, pyrexia, and vomiting. The most common (≥5%) Grade 3-4 laboratory abnormalities are increased GGT, increased CPK, hypophosphatemia, increased ALT, lymphopenia, increased AST, increased alkaline phosphatase, hyponatremia. ( 6.1 ) Histiocytic neoplasms: Most common adverse reactions (≥20%) are acneiform dermatitis, diarrhea, infection, fatigue, nausea, edema, dry skin, maculopapular rash, pruritus, dyspepsia, vomiting, dyspnea and urinary tract infections. The most common (≥5%) grade 3-4 lab abnormalities include: Hyponatremia, increased blood creatine phosphokinase, hypokalemia, increased blood creatinine, increased AST, hypocalcemia, lymphopenia, leukopenia, anemia ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Genentech at 1-888-835-2555 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. Unresectable or Metastatic Melanoma The safety of COTELLIC was evaluated in Trial 1, a randomized (1:1), double-blind, active-controlled trial in previously untreated patients with BRAF V600 mutation-positive, unresectable or metastatic melanoma [see Clinical Studies (14) ] . All patients received vemurafenib 960 mg twice daily on Days 1–28 and received either COTELLIC 60 mg once daily (n=247) or placebo (n=246) on Days 1–21 of each 28-day treatment cycle until disease progression or unacceptable toxicity. In the COTELLIC plus vemurafenib arm, 66% percent of patients were exposed for greater than 6 months and 24% of patients were exposed for greater than 1 year. Patients with abnormal liver function tests, history of acute coronary syndrome within 6 months, evidence of Class II or greater congestive heart failure (New York Heart Association), active central nervous system lesions, or evidence of retinal pathology were excluded from Trial 1. The demographics and baseline tumor characteristics of patients enrolled in Trial 1 are summarized in Clinical Studies [see Clinical Studies (14) ]. In Trial 1, 15% of patients receiving COTELLIC experienced an adverse reaction that resulted in permanent discontinuation of COTELLIC. The most common adverse reactions resulting in permanent discontinuation were liver laboratory abnormalities defined as increased aspartate aminotransferase (AST) (2.4%), increased gamma glutamyltransferase (GGT) (1.6%) and increased alanine aminotransferase (ALT) (1.6%); rash (1.6%); pyrexia (1.2%); and retinal detachment (2%). Among the 247 patients receiving COTELLIC, adverse reactions led to dose interruption or reductions in 55%. The most common reasons for dose interruptions or reductions of COTELLIC were rash (11%) , diarrhea (9%), chorioretinopathy (7%), pyrexia (6%), vomiting (6%), nausea (5%), and increased creatine phosphokinase (CPK) (4.9%). The most common (≥20%) adverse reactions with COTELLIC were diarrhea, photosensitivity reaction, nausea, pyrexia, and vomiting. Table 3. Incidence of Adverse Drug Reactions Occurring in ≥10% (All Grades) of Unresectable or Metastatic Melanoma Patien

5 WARNINGS AND PRECAUTIONS Review the Full Prescribing Information for vemurafenib for information on the serious risks of vemurafenib. New primary malignancies, cutaneous and non-cutaneous : Monitor patients for new malignancies prior to initiation of therapy, while on therapy, and for up to 6 months following the last dose of COTELLIC. ( 5.1 ) Hemorrhage : Major hemorrhagic events can occur with COTELLIC. Monitor for signs and symptoms of bleeding. ( 5.2 , 2.3 ) Cardiomyopathy : The risk of cardiomyopathy is increased in patients receiving COTELLIC with vemurafenib compared with vemurafenib as a single agent. The safety of COTELLIC has not been established in patients with decreased left ventricular ejection fraction (LVEF). Evaluate LVEF before treatment, after one month of treatment, then every 3 months thereafter during treatment with COTELLIC. ( 5.3 , 2.3 ) Severe Dermatologic Reactions : Monitor for severe skin rashes. Interrupt, reduce, or discontinue COTELLIC. ( 5.4 , 2.3 ) Serous Retinopathy and Retinal Vein Occlusion : Perform an ophthalmological evaluation at regular intervals and for any visual disturbances. Permanently discontinue COTELLIC for retinal vein occlusion (RVO). ( 5.5 , 2.3 ) Hepatotoxicity : Monitor liver laboratory tests during treatment and as clinically indicated. ( 5.6 , 2.3 ) Rhabdomyolysis : Monitor creatine phosphokinase periodically and as clinically indicated for signs and symptoms of rhabdomyolysis. ( 5.7 , 2.3 ) Severe Photosensitivity : Advise patients to avoid sun exposure. ( 5.8 , 2.3 ) Embryo-Fetal Toxicity : Can cause fetal harm. Advise females of reproductive potential of the potential risk to a fetus and to use effective contraception. ( 5.9 , 8.1 , 8.3 ) 5.1 New Primary Malignancies New primary malignancies, cutaneous and non-cutaneous, can occur with COTELLIC. Cutaneous Malignancies : In Trial 1, the following cutaneous malignancies or premalignant conditions occurred in the COTELLIC with vemurafenib arm and the vemurafenib arm, respectively: cutaneous squamous cell carcinoma (cuSCC) or keratoacanthoma (KA) (6% and 20%), basal cell carcinoma (4.5% and 2.4%), and second primary melanoma (0.8% and 2.4%). Among patients receiving COTELLIC with vemurafenib, the median time to detection of first cuSCC/KA was 4 months (range: 2 to 11 months), and the median time to detection of basal cell carcinoma was 4 months (range: 27 days to 13 months). The time to onset in the two patients with second primary melanoma was 9 months and 12 months. Perform dermatologic evaluations prior to initiation of therapy and every 2 months while on therapy. Manage suspicious skin lesions with excision and dermatopathologic evaluation. No dose modifications are recommended for COTELLIC [see Dosage and Administration (2.3) ] . Conduct dermatologic monitoring for 6 months following discontinuation of COTELLIC when administered with vemurafenib. Non-Cutaneous Malignancies : Based on its mechanism of action, vemurafenib may promote growth and development of malignancies [refer to the Full Prescribing Information for vemurafenib] . In Trial 1, 0.8% of patients in the COTELLIC with vemurafenib arm and 1.2% of patients in the vemurafenib arm developed non-cutaneous malignancies. Monitor patients receiving COTELLIC, when administered with vemurafenib, for signs or symptoms of non-cutaneous malignancies. 5.2 Hemorrhage Hemorrhage, including major hemorrhages defined as symptomatic bleeding in a critical area or organ, can occur with COTELLIC. In Trial 1, the incidence of Grade 3–4 hemorrhages was 1.2% in patients receiving COTELLIC with vemurafenib and 0.8% in patients receiving vemurafenib. Hemorrhage (all grades) was 13% in patients receiving COTELLIC with vemurafenib and 7% in patients receiving vemurafenib. Cerebral hemorrhage occurred in 0.8% of patients receiving COTELLIC with vemurafenib and in none of the patients receiving vemurafenib. Gastrointestinal tract hemorrhage (3.6% vs 1.2%), reproductive system hemorrh

4 CONTRAINDICATIONS None. None. ( 4 )

10 OVERDOSAGE There is no information on overdosage of COTELLIC.