Table 2. Stratified analyses results of median survival time.

Variance	R0 resection	Primary resection	Metastases resection	No resection	Total	Pvaluea
Age
≤45years	57	51	49	26	39	<0.001
>45years	51	41	29	20	28	<0.001
Race
White	54	44	31	22	31	<0.001
Black	25	30	26	15	20	<0.001
Other	84	58	64	24	40	<0.001
Grade
Well	NA	70	50	33	45	<0.001
Moderate	66	58	34	28	41	<0.001
Poor	35	34	22	18	26	<0.001
Stage T
T0	34	34	NA	24	30	0.006
T1	54	62	38	25	42	<0.001
T2	66	52	33	27	40	<0.001
T3	NA	37	45	26	34	<0.001
T4	33	32	16	18	23	<0.001
Radiation
Done	54	47	31	20	33	<0.001
None	50	39	31	22	27	<0.001
HR
HR+	66	52	38	28	38	<0.001
HR-	18	24	12	12	17	<0.001
Metastatic site
Distant lymph node	NA	NA	33	27	62	<0.001
Designated organsb	46	42	32	23	31	<0.001
Other organs	48	43	31	20	28	<0.001
Multiplec	38	26	18	17	21	<0.001
Total	51	43	31	21	29	<0.001

NA, not available.

^aComparison among the four groups.

^bDesignated organs, metastasis in the following organs: adrenal (suprarenal) gland, bone, other than the adjacent rib, contralateral (opposite) breast, lung, ovary, satellite nodule(s) in skin other than the primary breast.

^cMultiple mean metastases in at least two of the above sites