IV infusion over 30-90 min Monotherapy Wkly: 125 mg/m2 in repeated 6-wk cycles, comprising wkly treatment for 4 wk followed by a 2-wk rest. Once-every-2 wk: 250 mg/m2. Once-every-3 wk: 350 mg/m2. In combination w/ 5-FU & leucovorin: Treatment of metastatic colorectal cancer 125 mg/m2 w/ 500 mg/m2 5-FU & 20 mg/m2 leucovorin in repeated 6-wk cycles, comprising wkly treatment for 4 wk, followed by a 2-wk rest. In combination w/ cisplatin: Patient w/ other indicated cancers except for colorectal cancer 65 mg/m2 & 30 mg/m2 cisplatin in repeated 6-wk cycles, comprising wkly treatment for 4 wk, followed by a 2-wk rest. In combination w/ cetuximab for treatment of EGFR-expressing metastatic colorectal cancer Same dose as the last cycle of the prior irinotecan-containing regimen. Do not administer earlier than 1 hr after the end of cetuximab infusion. In combination w/ bevacizumab 125 mg/m2 irinotecan, 500 mg/m2 5-FU bolus, 20 mg/m2 folinic acid & bevacizumab once wkly for 4 wk every 6 wk.