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Sixty-eight patients with advanced breast cancer were treated with mitoxantrone and clinical responses assessed. Expression of c-erbB-2 protein and cytosolic glutathione S-transferase (GST) isoenzymes pi, alpha and mu by the primary tumours of these patients was determined immunohistochemically, and correlated with treatment response. Tumours overexpressing c-erbB-2 (n = 16, 23%) showed a lower response rate (50% vs 58%) and shorter duration of response to treatment, compared with c-erbB-2 negative tumours. These associations were not statistically significant but survival following start of treatment was significantly shorter in the c-erbB-2 positive group. For each GST isoenzyme, the response rate and duration of response of the group showing enzyme expression did not differ significantly from those with negatively staining tumours. These data do not support a role for expression of GSTs alone in resistance to mitoxantrone monotherapy in advanced breast cancer. The poorer post treatment survival of patients with c-erbB-2 positive tumours suggests they could be selected for more intensive treatment regimens.

Original publication

DOI

10.1038/bjc.1992.54

Type

Journal article

Journal

Br J Cancer

Publication Date

02/1992

Volume

65

Pages

271 - 274

Keywords

Adult, Aged, Breast Neoplasms, Female, Glutathione Transferase, Humans, Isoenzymes, Middle Aged, Mitoxantrone, Neoplasm Staging, Proto-Oncogene Proteins, Receptor, ErbB-2, Survival Analysis