Abstract 3888
Background
The C-cubed study investigates the optimal treatment strategy in patients with untreated metastatic colorectal cancer (mCRC). We tested the superiority of a sequential treatment of FP+BEV followed by OX+FP+BEV (arm A: OX “wait & go”) at first progression to a combination treatment of OX+FP+BEV (arm B: OX “stop & go”), trial information: UMIN000015405.
Methods
The Primary endpoint was time-to-failure of strategy (TFS). A target sample size of 304 patients was considered sufficient to validate an expected Hazard Ratio (HR) for TFS of arm A compared with arm B with 80% power and 2-sided 5% α in case of a true HR value of < 0.69. Secondary endpoints included overall response rate, overall survival (OS), progression-free survival, and safety.
Results
Between Dec 2014 and Sep 2016, 311 patients were enrolled, and 302 patients were randomized either to receive the arm A (n = 151) or B (n = 151) as a full analysis set (FAS). Superiority of TFS in the arm A was established in this study (HR, 0.475; 95% CI, 0.362–0.623; p < 0.0001). OSs in the arms A and B were not considered significantly different (HR, 0.930; 95% CI, 0.666–1.298). The patient population was predominantly positive for RAS mutant tumors (RAS MT) compared with that for RAS wild-type tumors (RAS WT), but this did not confer any clinical disadvantage in TFS to either arms (see table for details). We will present additional data associated with RAS status and differences between capecitabine and 5-fluorouracil at the meeting.Table:
571P
Table | Endpoint | Arm A, “wait & go” (n = 151) Months (95%CI) | Arm B, “stop & go” (n = 151) Months (95%CI) | p-value (log rank) |
---|---|---|---|---|
TFS (FAS) | 15.2 (12.5 – 17.2) | 7.6 (6.2 – 9.5) | <.0001 | |
OS (FAS) | 27.5 (24.4 – 32.7) | 29.4 (24.1 – 36.0) | 0.6692 | |
Factor | RAS WT (n = 112) Months (95%CI) | RAS MT (n = 167) Months (95%CI) | p-value (log rank) | |
TFS | Arm A | 14.0 (11.2 – 19.0) | 15.3 (12.4 – 17.2) | 0.3126 |
Arm B | 7.8 (7.0 – 10.5) | 7.4 (5.2 – 9.6) | 0.1615 | |
OS | Arm A | 27.5 (22.6 – NC) | 28.0 (23.4 – 32.7) | 0.3143 |
Arm B | 34.7 (24.5 – NC) | 24.3 (19.1 – 32.8) | 0.0265 |
Conclusions
The sequential “wait & go” strategy for OX was superior in TFS compared with the combinational “stop & go” accompanying with the equal survival benefit of nearly 30 months. Thus, the sequential approach with FP+BEV followed by OX is deemed an acceptable treatment strategy for patients with mCRC.
Clinical trial identification
UMIN000015405.
Editorial acknowledgement
Legal entity responsible for the study
Japan South West Oncology Group (JSWOG).
Funding
Chugai Pharmaceutical Co., Ltd.
Disclosure
T. Nagasaka: Speaker Bureau / Expert testimony: Eli Lilly Japan. Y. Shindo: Research grant / Funding (institution): Chugai; Research grant / Funding (institution): MSD; Research grant / Funding (self): Ono; Research grant / Funding (institution): Daiichi-Sankyo; Research grant / Funding (institution): Lilly. A. Tsuji: Honoraria (institution): Daiichi Sankyo; Honoraria (institution), Speaker Bureau / Expert testimony: Taiho Pharmaceutical; Honoraria (institution), Speaker Bureau / Expert testimony: Chugai Pharma; Honoraria (institution), Speaker Bureau / Expert testimony: Merck Serono; Honoraria (institution), Speaker Bureau / Expert testimony: Takeda Pharmaceutical; Honoraria (institution): Bristol-Myers Squibb Japan. Y. Tsuji: Honoraria (institution): Bayer Co. Ltd; Honoraria (institution): Merck Serono Co. Ltd; Honoraria (institution): Eli Lilly Japan; Honoraria (institution): Chugai Pharmaceutical Co. Ltd; Honoraria (institution): Taiho Pharmaceutical Co. Ltd; Honoraria (institution): Ono Pharmaceutical Co. Ltd; Honoraria (institution): Takeda Pharmaceutical Co. Ltd; Honoraria (institution): Medicon Co. Ltd. H. Mishima: Research grant / Funding (institution): Chugai Pharmaceutical Co. Ltd. All other authors have declared no conflicts of interest.
Resources from the same session
4331 - STING Agonist, ADU-S100, Yields Potent Antitumor Activity and Therapeutically Favorable Immune Profile in an Esophageal Adenocarcinoma Model
Presenter: Ali Zaidi
Session: Poster Display session 2
Resources:
Abstract
1770 - Increased assessment of HER2 in metastatic gastroesophageal cancer patients: a nationwide population-based cohort study
Presenter: Willemieke Dijksterhuis
Session: Poster Display session 2
Resources:
Abstract
3755 - A new docetaxel (DOC)-based triplet regimen does not improve the outcome of metastatic (M) or locally advanced (LA) gastric cancer (GC) as compared with an epirubicin (EPI) standard triplet regimen: a GISCAD trial.
Presenter: Roberto Labianca
Session: Poster Display session 2
Resources:
Abstract
2439 - The analysis of T cell subsets and clinical efficacy of immune checkpoint blockades in patients with advanced gastric cancer using multiplex immunohistochemistry
Presenter: Tae-yong Kim
Session: Poster Display session 2
Resources:
Abstract
2211 - First-line pembrolizumab (P), trastuzumab (T), capecitabine (C) and oxaliplatin (O) in HER2-positive metastatic esophagogastric adenocarcinoma.
Presenter: Yelena Janjigian
Session: Poster Display session 2
Resources:
Abstract
3046 - Monitoring patient-specific mutation in ctDNA and CTC for tumor response evaluation after neoadjuvant chemotherapy in locally advanced gastric cancer (NCT03425058)
Presenter: Tao Fu
Session: Poster Display session 2
Resources:
Abstract
4628 - Gastric cancer screening in BRCA 2 gene mutation carriers: should it be recommended?
Presenter: Inês Oliveira
Session: Poster Display session 2
Resources:
Abstract
2127 - Interim analysis of an observational/translational study for nivolumab treatment in advanced gastric cancer: JACCRO GC-08 (DELIVER trial)
Presenter: Yu Sunakawa
Session: Poster Display session 2
Resources:
Abstract
2264 - Prediction of S-1 adjuvant chemotherapy efficacy in Stage II/III gastric cancer treatment based on comprehensive gene expression analysis
Presenter: Masanori Terashima
Session: Poster Display session 2
Resources:
Abstract
2444 - Assessing the clinical utility of circulating tumour DNA through longitudinal liquid biopsy sampling in Oesophageal adenocarcinoma
Presenter: Emma Ococks
Session: Poster Display session 2
Resources:
Abstract