The declining use of axillary dissection in patients with early stage breast cancer

Objectives: To determine any changes in usage of axillary dissection over time from 1983 to 1993, and to characterize those patients who do not receive axillary node dissection. Methods: A total of 129,946 female patients receiving cancer-directed surgery for early stage breast cancer, who were identified from the SEER (Surveillance, Epidemiology and End Results) program and diagnosed from 1983 to 1993, were included in the study. The surgical treatment and axillary dissection were based on treatment data collected by the SEER during the first course of therapy. Logistic regression analyses were used to assess the effect of patient and tumor characteristics on the likelihood of not receiving different types of treatment. Results: The percentage of women not receiving axillary dissection has increased over time, from 14.4% in 1983 to 16.8% in 1993. Nearly a quarter of women undergoing breast conserving surgery for local stage breast cancer receive neither axillary dissection nor radiotherapy. Older, unmarried, and non-white women and those with very small (< 0.5 cm) or very large (> 4 cm) tumors were most likely to receive neither axillary node dissection nor irradiation. Among those not receiving axillary dissection, 42% had tumors 1-3 cm in size and were not receiving radiation therapy. Conclusions: There is an apparent divergence between the type of patient who has been recommended as an appropriate candidate for avoiding axillary dissection (those with small tumors and those who will receive adjuvant therapy) and those who are actually not receiving axillary dissection in the community.