Oxaliplatin has been the main treatment of choice in colorectal cancer in advanced settings. However, cellular mechanisms for the uptake, intracellular distribution and efflux of oxaliplatin are unknown. GST(glutathione S transferase)is member of a superfamily of metabolic enzymes that play an important role in the cell defense system. Current data suggest that GST-pi is associated with increased resistance to platinum-based chemotherapy. Specific roles for the single nucleotide polymorphisms in GST-pi gene GSTP1 in the treatment with oxaliplatin based chemotherapy, have been demonstrated in recent years.