How effective is the folfiri chemotherapy regimen for treating colon cancer?

Some effect: Single drug chemotherapy has failed to produce significant improvement in colorectal Ca. Combination chemo as in FOLFIRI with irinotecan has added about 5 month prolongation in survival and with immunotherapy using Avastin (bevacizumab) or Erbitux an additional 2-3 months can be observed. Chemo-Immuno with a mAb targeting the immunogenic protein appears to be giving further enhancement.