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. 2021 May 17;21(1):564.
doi: 10.1186/s12885-021-08312-7.

FOLFIRINOX-R study design: a phase I/II trial of FOLFIRINOX plus regorafenib as first line therapy in patients with unresectable RAS-mutated metastatic colorectal cancer

Antoine Adenis  1   2   3 , Thibault Mazard  4   5 , Julien Fraisse  6 , Patrick Chalbos  7 , Brice Pastor  4   8 , Ludovic Evesque  9 , Francois Ghiringhelli  10 , Caroline Mollevi  4   6 , Stéphanie Delaine  7 , Marc Ychou  4   5
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FOLFIRINOX-R study design: a phase I/II trial of FOLFIRINOX plus regorafenib as first line therapy in patients with unresectable RAS-mutated metastatic colorectal cancer

Antoine Adenis et al. BMC Cancer. .

Abstract

Background: The chemotherapy triplet FOLFOXIRI combined to the anti-VEGF antibody bevacizumab is an option in selected patients with metastatic colorectal cancer. In this setting, RAS-mutated metastatic colorectal cancer do not benefit the same from treatment than RAS-wildtype metastatic colorectal cancer do. Together with its antiangiogenic properties, the tyrosine-kinase inhibitor regorafenib has also anti-proliferative activities whatever the RAS status is. The present trial aims at studying the safety and the efficacy of regorafenib in combination with FOLFIRINOX - a chemotherapy triplet using a different dosing schedule than FOLFOXIRI - in patients with RAS-mutated metastatic colorectal cancer.

Methods: FOLFIRINOX-R is a prospective, multicentric, non-randomised, dose-finding phase 1-2 trial. The primary endpoints are the determination of the maximum tolerated dose, the recommended phase 2 dose, and the proportion of patients achieving disease control at 48-weeks. Phase 1 follows a 3 + 3 design (12 to 24 patients to be included). Sixty nine patients will be necessary in phase 2, including 5% non-evaluable ones, with the following assumptions, one-stage Fleming design, α = 5%, β = 20%, p0 = 35% and p1 = 50%. Key eligibility criteria include Eastern Cooperative Oncology Group Performance Status of ≤1 and RAS-mutated metastatic colorectal cancer not amenable to surgery with curative intent and not previously treated for metastatic disease. FOLFIRINOX (oxaliplatin 85 mg/m2, folinic acid 400 mg/m2, irinotecan 150-180 mg/m2, 5-fluorouracil: 400 mg/m2 then 2400 mg/m2 over 46 h) is administered every 14 days. Regorafenib (80 to 160 mg, as per dose-level) is administered orally, once daily on days 4 to 10 of each cycle.

Discussion: FOLFIRINOX-R is the first phase I/II study to evaluate the safety and efficacy of regorafenib in combination with FOLFIRINOX as frontline therapy for patients with RAS-mutated metastatic colorectal cancer.

Trial registration: EudraCT: 2018-003541-42 ; ClinicalTrials.gov: NCT03828799 .

Keywords: Chemotherapy triplet; Colorectal cancer; Phase 1–2 trial; Regorafenib.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Treatment design
Fig. 2
Fig. 2
Selection procedure
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