Factors affecting local or regional recurrence in breast cancer.

Between 1975 and 1989, 535 patients with infiltrating ductal carcinoma of the breast in various clinical stages were treated by modified radical mastectomy and axillary node clearance, followed by chemotherapy, endocrine therapy or radiotherapy. Median follow-up was 3 years (5 months to 15 years). Fifty-eight local or regional recurrences occurred. The 5-year and 10-year actuarial risks of breast recurrences were 14% +/- 2% and 23% +/- 4%, respectively. Using multivariate analysis with the Cox regression model, the most important multivariate-adjusted independent contributing factors to local or regional breast recurrences were age less than or equal to 40 (p less than 10(-4), relative risk = 2.94), positive lymph nodes greater than 3 (p less than 10(-3), relative risk = 2.57), and multicentricity (p = 0.044, relative risk = 2.73). The overall 5-year survival rate of recurrent patients was 64 +/- 7%, and was significantly worse when breast recurrence occurred in the first 18 months after operation. The multivariate-adjusted relative risk of death for early recurrence was 4.35 (p = 0.04). The unadjusted 5-year survival rate for early recurrence was 58% +/- 1%, and 85% +/- 8% for late recurrence. This study confirms the relationship between young age and low breast control rates. It emphasizes the adverse prognosis of early breast recurrences as compared to the relatively favorable outcome of late recurrences.