Patients receive monoclonal antibody ABX-EGF IV over 1 hour once weekly on weeks 0-3* (enrollment for the weekly dosing schedule completed as of 4/21/03 [with the exception of patients undergoing full pharmacokinetic analyses, described below]) OR once every 2 weeks on weeks 0, 2, 4, and 6* OR once every 3 weeks on weeks 0, 3, 6, and 9*. Patients undergoing full pharmacokinetic analyses receive a loading dose on week 0 and the subsequent 3 doses on weeks 3-5.