Events by Stage and Age Group
ER+ and TNBC subgroup analytic samples
Stage	Age group	N	Events	Censored	Event %
ER+
Stage 1	<50	74	8	66	10.8
Stage 1	50-64	90	20	70	22.2
Stage 1	65+	57	27	30	47.4
Stage 2	<50	150	33	117	22.0
Stage 2	50-64	82	27	55	32.9
Stage 2	65+	35	11	24	31.4
Stage 3	<50	49	31	18	63.3
Stage 3	50-64	38	23	15	60.5
Stage 3	65+	9	6	3	66.7
TNBC
Stage 1	<50	27	5	22	18.5
Stage 1	50-64	26	8	18	30.8
Stage 1	65+	17	8	9	47.1
Stage 2	<50	107	26	81	24.3
Stage 2	50-64	60	21	39	35.0
Stage 2	65+	11	7	4	63.6
Stage 3	<50	38	22	16	57.9
Stage 3	50-64	12	7	5	58.3
Stage 3	65+	5	5	0	100.0
Age groups: <50, 50–64, and 65+. Events reflect the recurrence-free survival event indicator used in the Cox models.