Long-Term Survival of Patients With Supraclavicular Metastases at Diagnosis of Breast Cancer
Background: Patients with supraclavicular metastases at diagnosis of breast cancer were classified between 1987 and 2002 as having stage M1 breast cancer according to the tumor-node-metastasis (TNM) system. The 2003 edition of the TNM staging guidelines has classified such patients as having stage IIIC disease. To determine relative prognosis, we compared long-term survival in a population-based cohort of patients with isolated supraclavicular metastases (nodal-M1) to outcomes of patients with stage IIIB or M1 (other) disease at presentation. Materials and Methods: Among patients with breast cancer and known tumor stage referred to the British Columbia Cancer Agency from 1976 to 1985, 336 IIIB, 233 M1, and 51 nodal-M1 patients were identified. Actuarial overall and breast cancer–specific survival rates were determined to 20 years. Results: Overall survival at 20 years was 13.2% for nodal-M1 cases (95% confidence interval [CI], 5% to 26%), 9.4% for IIIB cases (95% CI, 6% to 14%), and 1.3% for M1 (other) cases (95% CI, 0.4% to 3.5%; log-rank P < .0005). Overall survival was similar between nodal-M1 and IIIB cases (P = .27). Breast cancer–specific survival at 20 years was 24.1% for nodal-M1 cases (95% CI, 13% to 37%), 30.2% for IIIB cases (95% CI, 23% to 38%), and 3.9% for M1 (other) cases (95% CI, 2% to 8%; log-rank P < .0005). Breast cancer–specific survival was significantly different for nodal-M1 cases compared with either IIIB or M1 (other) cases (P = .008 for both). Conclusion: Patients with supraclavicular metastases at diagnosis have significantly better outcomes than patients with M1 (other) disease and overall survival similar to patients with IIIB disease. Reclassification as stage IIIC is appropriate for patients with breast cancer who present with supraclavicular nodal metastases alone.