Can a subgroup of node-negative breast carcinoma patients with T1-2 tumor who may benefit from postmastectomy radiotherapy be identified?

Abstract

To determine a subgroup of T1-2N0 breast carcinoma patients at high risk for local recurrence. In this retrospective study, univariate and multivariate prognostic factor analyses for local recurrence and distant recurrence were carried out in 502 patients. During the median observation time of 77 months (range, 24-191 months), 14 patients (2.8%) had local recurrence and 55 (11.0%) had distant recurrence. Tumor size (continuous, p = 0.03; hazard ratio [HR] 1.2; 95% confidence interval [CI], 1.1-1.7), grade (p = 0.01; HR, 2.4; 95% CI, 1.2-5.0), lymphatic vascular invasion (LVI) (p = 0.01; HR, 10.0; 95% CI, 2.4-17.3), estrogen receptor status (p = 0.01; HR, 6.3; 95% CI, 2.0-23.0) and cErbB2 status (p = 0.01; HR, 10.0; 95% CI 1.8-87.5) were strongly associated with distant recurrence. Tumor size (< or =2 cm vs. >2 cm; p = 0.05; HR, 5.4; 95% CI, 1.2-28.0) and LVI (p = 0.004; HR, 9.0; 95% CI, 2.0-41.0) in patients aged < or =40 years, and tumor size (< or =3 cm vs. >3 cm; p = 0.05; HR 8.6; 95% CI 1.3-75.0), LVI (p = 0.007; HR, 18.0; 95% CI, 2.1-153.0), and grade (p = 0.05; HR, 7.0; 95% CI, 1.2-63.0) in patients aged >40 years were the most important predictive factors for local recurrence. Among breast carcinoma patients, young patients with tumor size >2 cm and LVI and older patients with tumor size >3 cm, LVI, and high-grade tumor had a high risk of local recurrence.