Schéma : In first-line metastatic colorectal cancer (mCRC), baseline prognostic factors allowing death risk and strategy stratification are lacking. In this setting, a simple biological scoring system have recently been proposed, including LDH and CD138 binary status seric values, identifying one third of patients with worst prognostic.
Intensified-chemotherapy strategies, combining 5-fluorouracile, Oxaliplatin, Irinotecan and Bevacizumab, are beneficial for patients having a bad prognostic, defined by the BRAFV600E mutation, concerning 5-8% of first line mCRC.
For the 30% of patients with LDH-CD138 elevated score, the purpose of CLavSyn phase II study is to compare the PFS of one intensified arm (FOLFOXIRI Bevacizumab) to one standard chemotherapy arm, in order to better discriminate treatment strategies, at metastatic diagnosis.


Study Arms :

- Experimental: Arm A : FOLFOXIRI - bevacizumab
FOLFOXIRI + bevacizumab, 12 cures following by maintenance chemotherapy (bevacizumab + LV5FU2 or bevacizumab-capecitabine) until disease progression or limiting toxicities

- Active Comparator: Arm B: FOLFOX or FOLFIRI - bevacizumab
FOLFOX or FOLFIRI + bevacizumab 12 cures following by maintenance chemotherapy (bevacizumab + LV5FU2 ou bevacizumab capecitabine) until disease progression or limiting toxicities