p53 and c-erbB-2 as markers of resistance to adjuvant chemotherapy in breast cancer.
Recent literature suggests that c-erbB-2 and p53 alteration might be linked to drug resistance. This study investigates the relation of c-erbB-2 oncoprotein overexpression and p53 protein accumulation with prognosis in patients with node-positive breast cancer (NPBC) and assesses the modifying effect of these markers on response to short (1-10 courses) or prolonged (> 10 courses) adjuvant chemotherapy. This study is based on 458 patients with NPBC diagnosed from 1980 to 1986, with an average of 10 years of follow-up. Marker expression was evaluated by immunohistochemical analysis on formalin-fixed, paraffin-embedded material with antibodies to c-erbB-2 and p53. c-erbB-2 was expressed in 17.2% of the cases, and 19.1% of the tumors stained positively for p53. By multivariate analysis, women with prolonged adjuvant chemotherapy had better survival than those with a short course of chemotherapy among patients whose tumor lacked c-erbB-2 oncoprotein expression (P = .0245) or p53 protein accumulation (P = .0477). Prolonged chemotherapy, however, was associated with little or no change in survival among patients whose tumor expressed those markers. The present study adds support to the hypothesis linking c-erbB-2 and p53 expression to drug resistance.
Têtu
B
B
Department of Pathology, Centre de Recherche en Cancérologie, Laval University, Québec City, Québec, Canada. Bernard.Tetu@crhdq.ulaval.ca
Brisson
J
J
Plante
V
V
Bernard
P
P
D000328:Adult; D000368:Aged; D000970:Antineoplastic Agents / Q000008:administration & dosage; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D001943:Breast Neoplasms / Q000378:metabolism* / Q000401:mortality* / Q000628:therapy; D017024:Chemotherapy, Adjuvant; D003131:Combined Modality Therapy; D019008:Drug Resistance, Neoplasm; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008875:Middle Aged; D011379:Prognosis; D016016:Proportional Hazards Models; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000378:metabolism*; D012189:Retrospective Studies; D015996:Survival Rate; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*
D000970:Antineoplastic Agents; D018719:Erb-b2 Receptor Tyrosine Kinases; D016159:Tumor Suppressor Protein p53