Table 3. Characteristics of tumor type by patient cohort and by age.

Age:	<40				40–48				49–60				>60
	Cohort 1		Cohort2		Cohort 1		Cohort2		Cohort1		Cohort 2		Cohort 1
Total (n)	68		56		141		166		165		205		65
Median age at diagnosis (years)	35.4		36		44		45.3		54		52.2		65.4
T stage	n	(%)	n	(%)	n	(%)	n	(%)	n	(%)	n	(%)	n	(%)
T1	30	45	34	61	75	53	114	69	89	54	153	75	38	59
T2	38	55	21	38	66	47	52	31	75	45	52	25	26	41
T3	0	0	1	2	0	0	0	0	1	1	0	0	0	0
Comparison	P = 0.015				P = 0.006				P = 0.001
Grade
I	5	7	8	14	24	17	34	20	29	18	62	30	21	32
II	21	32	20	36	48	34	63	38	71	43	90	44	27	42
III	41	59	28	50	68	49	69	42	61	37	53	26	17	26
Comparison	P = 0.321				P = 0.775				P = 0.009
Hormone receptor
Positive	38	57	36	64	100	71	132	80	123	75	174	85	52	80
Negative	30	43	20	36	41	29	34	20	42	25	31	15	13	20
Comparison	P = 0.282				P = 0.109				P = 0.012
70-gene
Good prognosis	17	25	17	30	55	39	83	50	67	41	119	58	41	63
Poor prognosis	51	75	39	70	86	61	83	50	98	59	86	42	24	37
Comparison	P = 0.506				P = 0.054				P = 0.012

Clinicopathologic characteristics of study patients by age group are shown for each cohort