In a previous study, tumour response to CDDP chemoradiation was observed in a HNSCC patient with distinct genotypes of GSTT1 and GSTP1 Ile105Val polymorphisms12; however, another study indicated that the GSTM1, GSTT1, and GSTP1 genes did not alter response to CDDP9. The gene discussed is GSTP1; the disease is neoplasm.