1E10 anti-idiotype vaccine, metastatic colon, phase II.

Interventions: Onco-specific treatment: -Surgical treatment in resectable tumors (liver, lung), followed by first-line systemic chemotherapy four weeks later. -First-line systemic chemotherapy in non-resectable tumors. First-line chemotherapy: Six cycles every 4 weeks of: - Leucovorine (folinic acid) 20 mg/ m2/ daily, intravenously, for 5 days. Leucovorine will be administered after dilution in 50 cc of a 0.9% sodium chloride solution, intravenously, 20 minutes before 5-FU. - 5-Fluoracyl (5-FU): 375 mg/ m2/ daily, intravenously, for 5 days. The 5-FU will be administered either in a 5% dextrose solution or a 0.9% sodium chloride solution, 500 cc in 24 hour continuous infusion. Schemes containing Oxaliplatino, Irinotecan or a similar drug authorized for this purpose can also be used in combination with those nationally and internationally authorized and regulated. In conjunction with chemotherapy, the following can be administered: - 100 mg Dimenhydrate, either intravenously or in the chemotherapy infusion flask. - 20 mg Metoclopramide, either intravenously or in the chemotherapy infusion flask. Vaccine preparation: Patients will be administered a total of 15 vaccines, beginning 4 weeks after latest onco-specific treatment. The first 5 vaccines will be administered at 14 day intervals, and the other 10 every month until reaching one year immunization. Each vaccine will contain 1 ml of the vaccine preparation, at a 2 mg/ ml concentration of the 1E10 antibody. The total dose will be subdivided into 4 equal sub-doses, administering 250 µl (0.25 ml) at each inoculation site. The 1E10 anti-idiotype vaccine will be intradermally injected. The potential immunization sites are: deltoid region, anterior surface of forearm, provided that no resection has been performed, and posterior surface of leg.