Table 1.

Demography of the breast cancer population followed during the period of 1958‐2015

No. of females followed	4 216 676
Number of cases
A. No. of BC diagnoses	87 752
B. No. of SPC diagnoses in BC patients	14 952 (17.0% of all BC survivors, B/A)
C. Familial SPC	10 280 (68.8% of all BC survivors with SPC, C/B)
D. Familial SPC (concordant)	2228 (21.6% of all familial SPC, D/C)
E. Familial SPC (discordant)	8052 (77.4% of all familial SPC, D/C)
F. No. of third primary cancer diagnoses	2543 (17% of all BC survivors with SPC, F/B)
Number of deaths
G. Deaths among all BC patients	18 998 (21.6% of all BC patients, G/A)
H. Deaths among BC patients with SPC	4828 (32.3% of all diagnosed with SPC, H/B)
I. Deaths among SPC patients with positive family history	3356 (32.6% of all familial SPC diagnoses, I/C)
J. Deaths among SPC patients with negative family history	1472 (31.5% of all SPC patients with negative family history, J/(B‐C))
K. Deaths among BC patients without SPC	14 170 (16.1% of all BC survivors without SPC, K/(A‐B))

BC, breast cancer; SPC, second primary cancer.