Dataset Information

Study of Cobimetinib in Combination With Atezolizumab and Bevacizumab in Participants With Gastrointestinal and Other Tumors

ABSTRACT: This is an open-label, multicenter, single-arm, two-stage, Phase Ib study designed to assess the safety, tolerability, and pharmacokinetics of oral cobimetinib with intravenous (IV) atezolizumab and bevacizumab in participants with metastatic colorectal cancer (mCRC) who have received and progressed on at least one prior line of therapy that contained a fluoropyrimidine and oxaliplatin or irinotecan. There are two stages in this study: Stage 1 (safety run-in phase) and Stage 2 (dose expansion phase with two cohorts, an expansion cohort and a biopsy cohort).

DISEASE(S): Colorectal Cancer,Colorectal Neoplasms

PROVIDER: 2223119 | ecrin-mdr-crc |

REPOSITORIES: ECRIN MDR

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Project description:Interventions: Combination treatment using cetuximab, cobimetinib and palbociclib. This is a two part open label study using escalating doses of these drugs. Phase 1 will enroll 3-6 patients in one of 6 Cohorts, for dose escalation. The initial dose escalation will start at cetuximab 150mg/m2 intravenously (IV) + cobimetinib 20 mg orally once daily (po qd) + palbociclib 50mg orally once daily (po qd), for Cohort 1. Cohort 2 = cetuximab 150mg/m2 IV + cobimetinib 20 mg po qd + palbociclib 75mg po qd. Cohort 3 = cetuximab 150mg/m2 IV + cobimetinib 40 mg po qd + palbociclib 75mg po qd. Cohort 4 = cetuximab 150mg/m2 IV + cobimetinib 60 mg po qd + palbociclib 75mg po qd. Cohort 5 = cetuximab 200mg/m2 IV + cobimetinib 60 mg po qd + palbociclib 75mg po qd. Cohort 6 = cetuximab 250mg/m2 IV + cobimetinib 60 mg po qd + palbociclib 100mg po qd. Cetuximab will be administered weekly via intravenous infusion. Cobimetinib will be taken orally once daily for the first 21 consecutive days in a 28 day treatment cycle. Cobimetinib will be taken in tablet form. Palbociclib will be taken orally once daily for first 21 consecutive days in a 28 day treatment cycle. Palbociclib will be taken in capsule form. Neither of these two drugs will be given in the last 7 days of this 28 day cycle. Cohorts of 3 patients will be enrolled at each dose level (with the option of up to six patients for each cohort if necessary) to assess toxicity. Each patient will participate in only one cohort to determine dose limiting toxicities of the combination. Patients at each dose level will be treated and observed through the end of the first cycle before treatment of subjects at the next higher dose level can begin. Cohorts 1 to 6 will randomly assign consecutive patien Primary outcome(s): Phase 1: Determination of Dose Limiting Toxicity (DLT). A DLT will be defined using the National Cancer Institute (NCI) Common Toxicity Criteria for Adverse Events (CTCAE) v 5.0 [Phase 1 DLTs will be assessed during the first cycle of treatment (28 days) and are events that are considered possiby related to the study drug combination for each cohort. After the treatment of each cohort, data will be reviewed to assess patient status and study drug related toxicities from the current cohort before deciding the escalation plan and dose level for the next cohort. ];Phase 2: Determination of Objective Response Rate as determined by MRI scanning with RECIST criteria reporting[Phase 2: patients will be reviewed for objective response rate after at least 2 treatment cycles] Study Design: Purpose: Treatment; Allocation: Non-randomised trial; Masking: Open (masking not used);Assignment: Other;Type of endpoint: Safety

Project description:BACKGROUND:Preclinical evidence suggests that MEK inhibition promotes accumulation and survival of intratumoral tumor-specific T cells and can synergize with immune checkpoint inhibition. We investigated the safety and clinical activity of combining a MEK inhibitor, cobimetinib, and a programmed cell death 1 ligand 1 (PD-L1) inhibitor, atezolizumab, in patients with solid tumors. PATIENTS AND METHODS:This phase I/Ib study treated PD-L1/PD-1-naive patients with solid tumors in a dose-escalation stage and then in multiple, indication-specific dose-expansion cohorts. In most patients, cobimetinib was dosed once daily orally for 21?days on, 7?days off. Atezolizumab was dosed at 800?mg intravenously every 2?weeks. The primary objectives were safety and tolerability. Secondary end points included objective response rate, progression-free survival, and overall survival. RESULTS:Between 27 December 2013 and 9 May 2016, 152 patients were enrolled. As of 4 September 2017, 150 patients received ?1 dose of atezolizumab, including 14 in the dose-escalation cohorts and 136 in the dose-expansion cohorts. Patients had metastatic colorectal cancer (mCRC; n?=?84), melanoma (n?=?22), non-small-cell lung cancer (NSCLC; n?=?28), and other solid tumors (n?=?16). The most common all-grade treatment-related adverse events (AEs) were diarrhea (67%), rash (48%), and fatigue (40%), similar to those with single-agent cobimetinib and atezolizumab. One (<1%) treatment-related grade 5 AE occurred (sepsis). Forty-five (30%) and 23 patients (15%) had AEs that led to discontinuation of cobimetinib and atezolizumab, respectively. Confirmed responses were observed in 7 of 84 patients (8%) with mCRC (6 responders were microsatellite low/stable, 1 was microsatellite instable), 9 of 22 patients (41%) with melanoma, and 5 of 28 patients (18%) with NSCLC. Clinical activity was independent of KRAS/BRAF status across diseases. CONCLUSIONS:Atezolizumab plus cobimetinib had manageable safety and clinical activity irrespective of KRAS/BRAF status. Although potential synergistic activity was seen in mCRC, this was not confirmed in a subsequent phase III study. CLINICALTRIALS.GOV IDENTIFIER:NCT01988896 (the investigators in the NCT01988896 study are listed in the supplementary Appendix, available at Annals of Oncology online).

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Study of Cobimetinib in Combination With Atezolizumab and Bevacizumab in Participants With Gastrointestinal and Other Tumors

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