Survival Outcome and Impact of Chemotherapy in T1 Node-Negative Triple-Negative Breast Cancer: A SEER Database Analysis

Table 2

T1 tumor survival outcomes of patients following chemotherapy treatment.

Outcome	Chemotherapy			No chemotherapy or unknown
	5-year estimate (%)	95% CI	Total no. of events	5-year estimate (%)	95% CI	Total no. of events
T1a
OS	97.8	93.5–100.0	1	91.1	86.8–95.4	16	0.039
BCSS	97.8	93.5–100.0	1	97.2	94.7–99.7	5	0.388
T1b
OS	91.9	88.2–95.6	20	88.6	84.7–92.5	32	0.195
BCSS	94.1	90.8–97.4	14	94.0	91.1–96.9	16	0.399
T1c
OS	91.4	89.4–93.4	73	75.5	72.0–79.0	166	<0.001
BCSS	94.5	92.9–96.1	47	89.9	87.4–92.4	64	0.004

Abbreviations: OS, overall survival; BCSS, breast cancer-specific survival; CI, confidence interval.