Glutathione S-transferase M1 null genotype: lack of association with tumour characteristics and survival in advanced breast cancer

Table 2 Clinical response to primary chemotherapy and breast cancer outcome

	GSTM1
Parameters	Present	Null	P
Objective response^*	76.9%	75.5%	0.8719^†
Disease-free survival (months)	42.00 ± 2.65	54.43 ± 5.67	0.8094^‡
Overall survival (months)	74.82 ± 3.95	72.73 ± 4.81	0.9729^‡

^*Objective response was estimated as complete and partial responses. ^†Estimated by Pearson χ² test. ^‡Estimated by log rank test, median± standard error. GST, glutathione S-transferase.

ISSN: 1465-542X