Table 2.

Rates of Chemotherapy Use in Older Women by Clinical Subgroup

Chemotherapy Use	Chemotherapy Possibly Indicated (n = 420) ER Positive, Node Negative	Chemotherapy Indicated (n = 379)*
		ER Positive, Node Positive	ER Negative
			Node Negative	Node Positive
No. of patients	420	238	79	62
Received chemotherapy, %	16	65	63	94
95% CI	13 to 20	59 to 71	52 to 72	91 to 97

NOTE. Chemotherapy was defined as any systemic regimen, including neoadjuvant and adjuvant therapies, based on medical record audits at registration and the 6-month follow-up. Two women are excluded as a result of missing hormonal receptor status. Among the 318 women who received chemotherapy and had available chemotherapy dates, 16 (5%) received this modality as neoadjuvant treatment. The unadjusted overall rate of chemotherapy was 42% (95% CI, 38% to 45%).

Abbreviation: ER, estrogen receptor.

^*The unadjusted overall rate of chemotherapy for the three subgroups of the indicated group was 69% (95% CI, 65% to 74%).