There are currently three active cytotoxic agents that have been shown to be effective in the treatment of advanced colorectal cancer: 5-Fluorouracil combined with Leucovorin (5-FU/LV), Irinotecan and Oxaliplatin. During the last few years, the median overall survival of patients with advanced CRC has been substantially increased from 12 months to about 21-22 months, when combination of these chemotherapeutic agents are administered. Combinations of 5-Fluorouracil/Leucovorin (5-FU/LV) either as bolus (Roswell Park) or infusional administration (De Gramont schedule) r weekly infusional (AIO regimen), combined with Irinotecan or Oxaliplatin accepted as the mainstay of first line treatment.