A Study Comparing Vemurafenib Versus Vemurafenib Plus Cobimetinib in Participants With Metastatic Melanoma

To evaluate the efficacy of vemurafenib in combination with cobimetinib (GDC-0973), compared with vemurafenib and placebo, in previously untreated BRAF V600 mutation-positive patients with unresectable locally advanced or metastatic melanoma, as measured by progression-free survival (PFS), assessed by the study site investigator.

Sex

All

Minimum age

18 Years

Inclusion Criteria:

* Participants with histologically confirmed melanoma, either unresectable stage IIIc or stage IV metastatic melanoma, as defined by the American Joint Committee on Cancer 7th edition. Unresectability of stage IIIc disease must have confirmation from a surgical oncologist
* Participants must be naïve to treatment for locally advanced unresectable or metastatic disease (ie, no prior systemic anti-cancer therapy for advanced disease; stage IIIc and IV). Prior adjuvant immunotherapy (including ipilimumab) is allowed
* Documentation of BRAF V600 mutation-positive status in melanoma tumor tissue (archival or newly obtained tumor samples) using the cobas 4800 BRAF V600 mutation test
* Measurable disease per RECIST v1.1
* Eastern Clinical Oncology Group performance status of 0 or 1
* Consent to provide archival for biomarker analyses
* Consent to undergo tumor biopsies for biomarker analyses
* Life expectancy greater than or equal to (≥) 12 weeks
* Adequate hematologic and end organ function

Exclusion Criteria:

* History of prior rapidly accelerated fibrosarcoma or mitogen-activated protein kinase pathway inhibitor treatment
* Palliative radiotherapy within 14 days prior to the first dose of study treatment
* Major surgery or traumatic injury within 14 days prior to first dose of study treatment
* Active malignancy other than melanoma that could potentially interfere with the interpretation of efficacy measures. Participants with a previous malignancy within the past 3 years are excluded except for participants with resected basal cell carcinoma or squamous cell carcinoma of the skin, melanoma in-situ, carcinoma in-situ of the cervix, and carcinoma in-situ of the breast
* History of or evidence of retinal pathology on ophthalmological examination that is considered a risk factor for neurosensory retinal detachment, retinal vein occlusion, or neovascular macular degeneration
* Uncontrolled glaucoma with intraocular pressure
* Serum cholesterol ≥ Grade 2
* Hypertriglyceridemia ≥ Grade 2
* Hyperglycemia (fasting) ≥ Grade 2
* History of clinically significant cardiac dysfunction
* Participants with active central nervous system (CNS) lesions (including carcinomatous meningitis) are excluded. However, participants are eligible if:

  1. All known CNS lesions have been treated with stereotactic therapy or surgery, AND
  2. There has been no evidence of clinical and radiographic disease progression in the CNS for ≥ 3 weeks after radiotherapy or surgery
* Current severe, uncontrolled systemic disease
* History of malabsorption or other condition that would interfere with absorption of study drugs
* Pregnant, lactating, or breast feeding women

• DERIVEDBarteselli G, Goodman GR, Patel Y, Caro I, Xue C, McCallum S. Characterization of Serous Retinopathy Associated with Cobimetinib: Integrated Safety Analysis of Four Studies. Drug Saf. 2022 Dec;45(12):1491-1499. doi: 10.1007/s40264-022-01248-2. Epub 2022 Oct 30. PMID 36310331
• DERIVEDAscierto PA, Dreno B, Larkin J, Ribas A, Liszkay G, Maio M, Mandala M, Demidov L, Stroyakovskiy D, Thomas L, de la Cruz-Merino L, Atkinson V, Dutriaux C, Garbe C, Hsu J, Jones S, Li H, McKenna E, Voulgari A, McArthur GA. 5-Year Outcomes with Cobimetinib plus Vemurafenib in BRAFV600 Mutation-Positive Advanced Melanoma: Extended Follow-up of the coBRIM Study. Clin Cancer Res. 2021 Oct 1;27(19):5225-5235. doi: 10.1158/1078-0432.CCR-21-0809. PMID 34158360
• DERIVEDAscierto PA, Ribas A, Larkin J, McArthur GA, Lewis KD, Hauschild A, Flaherty KT, McKenna E, Zhu Q, Mun Y, Dreno B. Impact of initial treatment and prognostic factors on postprogression survival in BRAF-mutated metastatic melanoma treated with dacarbazine or vemurafenib +/- cobimetinib: a pooled analysis of four clinical trials. J Transl Med. 2020 Aug 3;18(1):294. doi: 10.1186/s12967-020-02458-x. PMID 32746839
• DERIVEDde la Cruz-Merino L, Di Guardo L, Grob JJ, Venosa A, Larkin J, McArthur GA, Ribas A, Ascierto PA, Evans JTR, Gomez-Escobar A, Barteselli G, Eng S, Hsu JJ, Uyei A, Dreno B. Clinical features of serous retinopathy observed with cobimetinib in patients with BRAF-mutated melanoma treated in the randomized coBRIM study. J Transl Med. 2017 Jun 24;15(1):146. doi: 10.1186/s12967-017-1246-0. PMID 28646893
• DERIVEDDreno B, Ribas A, Larkin J, Ascierto PA, Hauschild A, Thomas L, Grob JJ, Koralek DO, Rooney I, Hsu JJ, McKenna EF, McArthur GA. Incidence, course, and management of toxicities associated with cobimetinib in combination with vemurafenib in the coBRIM study. Ann Oncol. 2017 May 1;28(5):1137-1144. doi: 10.1093/annonc/mdx040. PMID 28444112
• DERIVEDAscierto PA, McArthur GA, Dreno B, Atkinson V, Liszkay G, Di Giacomo AM, Mandala M, Demidov L, Stroyakovskiy D, Thomas L, de la Cruz-Merino L, Dutriaux C, Garbe C, Yan Y, Wongchenko M, Chang I, Hsu JJ, Koralek DO, Rooney I, Ribas A, Larkin J. Cobimetinib combined with vemurafenib in advanced BRAF(V600)-mutant melanoma (coBRIM): updated efficacy results from a randomised, double-blind, phase 3 trial. Lancet Oncol. 2016 Sep;17(9):1248-60. doi: 10.1016/S1470-2045(16)30122-X. Epub 2016 Jul 30.