Estimation of age- and stage-specific Catalan breast cancer survival functions using US and Catalan survival data

BMC Cancer

Table 2 Estimated relative cumulative survival at five (S(5)) and ten (S (10)) years after breast cancer diagnosis in Catalonia and the USA.

Source	Stage	N ₅	S(5)	IC(0.95)	N ₁₀	S(10)	IC(0.95)
Cat 1980–89	SEER Historical stage
	Localized	433	0.87	0.84 – 0.91	312	0.71	0.66 – 0.77
	Regional	384	0.58	0.54 – 0.62	207	0.38	0.34 – 0.42
	Distant	23	0.11	0.07 – 0.18	2	-	-
USA 1975–79
	Localized	16198	0.9	0.90 – 0.91	12847	0.82	0.82 – 0.83
	Regional	11056	0.7	0.69 – 0.70	7172	0.54	0.54 – 0.55
	Distant	603	0.2	0.18 – 0.22	219	0.11	0.10 – 0.12
Cat 1990–2001	AJCC stage
	I	389	0.99	0.96 – 1.01	171	0.98	0.94 – 1.02
	II-	195	0.92	0.87 – 0.97	86	0.82	0.75 – 0.90
	II+	309	0.84	0.80 – 0.89	138	0.67	0.62 – 0.73
	III	103	0.58	0.50 – 0.66	41	0.44	0.36 – 0.54
	IV	36	0.29	0.21 – 0.40	10	0.1	0.05 – 0.19
USA 1990–2001
	I	103291	0.98	0.97 – 0.98	38284	0.94	0.94 – 0.95
	II-	27528	0.92	0.92 – 0.92	10046	0.86	0.85 – 0.86
	II+	50159	0.86	0.86 – 0.86	15529	0.75	0.74 – 0.75
	III	10086	0.61	0.61 – 0.62	2833	0.48	0.47 – 0.49
	IV	2654	0.24	0.23 – 0.24	418	0.12	0.11 – 0.13

Note: N ₅ and N ₁₀ correspond to the number of women at risk at the beginning of the interval in the Girona Cancer Registry (GCR) for Catalonia and in the Surveillance Epidemiology and End Results (SEER) for the USA. The 95% confidence intervals were obtained using Greenwood's formula.

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