Among women with high-risk tumors, chemotherapy was administered
to 71.9% of patients (Table 2). Among women who received chemotherapy,
54.6% underwent lymphadenectomy, while 36.3% of those
who did not receive chemotherapy had a node dissection. Chemotherapy
use increased from 62.5% (95% CI, 43.1–81.9%) in 1992 to 77.1% (95%
CI 66.5–87.6%) in 2009 (P = 0.17) (Fig. 1). For patients with high-risk
tumors, advancing stage and higher grade were associated with the receipt
of chemotherapy (Table 3). In contrast, older women were less
likely to receive chemotherapy (P b 0.05 for all).