This invention provides a method for increasing apoptosis in a cancer cell comprising contacting the cancer cell with (a) oxaliplatin and (b) C6-ceramide, sequentially or concomitantly, wherein the oxaliplatin and C6-ceramide are in amounts such that the apoptosis induced by the combination of oxaliplatin and C6-ceramide is greater than the apoptosis induced by contacting the cancer cell with either oxaliplatin alone or C6-ceramide alone. This invention also provides a method of decreasing the size of a tumor, which method comprises contacting the tumor with (a) oxaliplatin and (b) C6-ceramide, sequentially or concomitantly, wherein the oxaliplatin and C6-ceramide are in amounts such that the decrease in tumor size induced by the combination of oxaliplatin and C6-ceramide is greater than the decrease in tumor size induced by contacting the tumor with either oxaliplatin alone or C6-ceramide alone.
