Table 2.
Risk of second primary cancer among men with first primary breast cancer
| Cancer site | N | PERYR | OBS | EXP | SIR (95 percent CI) |
| All malignancies, breast included | 1,926 | 8,460.08 | 221 | 190.42 | 1.16 (1.01–1.32) |
| All malignancies, breast excluded | 1,926 | 8,529.63 | 201 | 191.63 | 1.05 (0.91–1.20) |
| Prostate | 1,926 | 8,803.74 | 69 | 72.30 | 0.95(0.74–1.21) |
| Second breast | 1,906 | 8,947.89 | 20 | 0.38 | 52.12 (31.83–80.49) |
| Colorectal | 1,926 | 9,025.49 | 26 | 22.64 | 1.15 (0.75–1.68) |
| Lung and bronchus | 1,926 | 9,065.75 | 23 | 32.76 | 0.70 (0.45–1.05) |
| Bladder | 1,926 | 9,031.02 | 20 | 13.46 | 1.49 (0.91–2.29) |
| Melanomaa | 1,454 | 6,971.11 | 14 | 4.69 | 2.98 (1.63–5.00) |
| Stomach | 1,926 | 9,074.43 | 10 | 4.74 | 2.11 (1.01–3.88) |
Bold numbers indicate that the 95 percent confidence interval (CI) does not include 1.00. aNon-Hispanic whites only. EXP, expected; N, number of subjects; OBS, observed; PERYR, person years at risk; SIR, standardized incidence ratios.