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Complete Sequencing of TP53 Predicts Poor Response to Systemic Therapy of Advanced Breast Cancer¹

Department of Medical Oncology, Division of Endocrine Oncology [E. M. J. J. B., J. A. F., S. C. H-L., M. P. L., I. L. v. S., M. E. M-v. G., C. J. C. C., H. P., J. G. M. K.] and Department of Statistics [W. L. J. v. P.], Rotterdam Cancer Institute (Daniel den Hoed Kliniek)/University Hospital Rotterdam, 3008 AE Rotterdam, the Netherlands; Departments of Human and Clinical Genetics [R. V., P. D., B. B.] and Pathology [C. C.], Leiden University Medical Center, Leiden 2300, the Netherlands; and Amersham Pharmacia Biotech, Upsala, Sweden [M. I.]

TP53 has been implicated in regulation of the cell cycle, DNA repair, and apoptosis. We studied, in primary breast tumors through direct cDNA sequencing of exons 2–11, whether TP53 gene mutations can predict response in patients with advanced disease to either first-line tamoxifen therapy (202 patients, of whom 55% responded) or up-front (poly)chemotherapy (41 patients, of whom 46% responded). TP53 mutations were detected in 90 of 243 (37%) tumors, and one-fourth of these mutations resulted in a premature termination of the protein. The mutations were observed in 32% (65 of 202) of the primary tumors of tamoxifen-treated patients and in 61% (25 of 41) of the primary tumors of the chemotherapy patients. TP53 mutation was significantly associated with a poor response to tamoxifen [31% versus 66%; odds ratio (OR), 0.22; 95% confidence interval (CI), 0.12–0.42; P < 0.0001]. Patients with TP53 gene mutations in codons that directly contact DNA or with mutations in the zinc-binding domain loop L3 showed the lowest response to tamoxifen (18% and 15% response rates, respectively). TP53 mutations were related, although not significantly, to a poor response to up-front chemotherapy (36% versus 63%; OR, 0.34; 95% CI, 0.09–1.24). In multivariate analysis for response including the classical parameters age and menopausal status, disease-free interval, dominant site of relapse, and levels of estrogen receptor and progesterone receptor, TP53 mutation was a significant predictor of poor response in the tamoxifen-treated group (OR, 0.29; 95% CI, 0.13–0.63; P = 0.0014). TP53-mutated and estrogen receptor-negative (<10 fmol/mg protein) tumors appeared to be the most resistant phenotype. Interestingly, the response of patients with TP53 mutations to chemotherapy after tamoxifen was not worse than that of patients without these mutations (50% versus 42%; OR, 1.35, nonsignificant). The median progression-free survival after systemic treatment was shorter for patients with a TP53 mutation than for patients with wild-type TP53 (6.6 and 0.6 months less for tamoxifen and up-front chemotherapy, respectively). In conclusion, TP53 gene mutation of the primary tumor is helpful in predicting the response of patients with metastatic breast disease to tamoxifen therapy. The type of mutation and its biological function should be considered in the analyses of the predictive value of TP53.

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