<qa>  What is the risk of lethal infections when treated with marrow-suppressive therapy- Because patients with immune deficiency are at increased risk of lethal infections when treated with marrow-suppressive therapy, HIV-positive patients receiving combination anti-retroviral therapy are excluded from the study because of possible pharmacokinetic interactions with oxaliplatin or other agents administered during the study; appropriate studies will be undertaken in patients receiving combination anti-retroviral therapy when indicated 