Table 3. Secondary cancers occurring at least 1 year after a MCC diagnosis.
| Cancer site | Observed | Expected | SIR | (95% CI) |
|---|---|---|---|---|
| All types | 65 | 57.4 | 1.13 | (0.89–1.44) |
| Non-melanoma of the skin | 27 | 4.07 | 6.63 | (4.55–9.67) |
| Female breast | 5 | 4.91 | 1.02 | (0.42–2.45) |
| Colorectal | 5 | 7.88 | 0.63 | (0.26–1.53) |
| Lung | 5 | 4.13 | 1.21 | (0.5–2.91) |
| Melanoma of skin | 5 | 1.4 | 3.58 | (1.49–8.6) |
| Prostate | 3 | 7.72 | 0.39 | (0.13–1.2) |
| Bladder etc. | 3 | 3.19 | 0.94 | (0.3–2.92) |
| Larynx | 2 | 0.21 | 9.51 | (2.38–38.04) |
| Brain central nervous system | 1 | 0.84 | 1.19 | (0.17–8.44) |
| Kidney | 1 | 0.91 | 1.1 | (0.15–7.79) |
| Liver | 1 | 0.52 | 1.94 | (0.27–13.74) |
| Leukaemia | 1 | 1.15 | 0.87 | (0.12–6.17) |
| Non-Hodgkin lymphoma | 1 | 1.43 | 0.7 | (0.1–4.97) |
| Other female genital organs | 1 | 0.34 | 2.94 | (0.41–20.9) |
| Ovary etc. | 1 | 1.46 | 0.69 | (0.1–4.87) |
Abbreviations: CI=confidence interval; MCC=merkel cell carcinoma.