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. 2010 Nov 16;104(1):178–180. doi: 10.1038/sj.bjc.6605989

Table 4. Overall secondary cancers stratified by follow-up.

Follow-up Observed Expected SIR (95% CI)
6–12 months 14 6.08 2.3 (1.36–3.89)
1–4 years 41 9.14 4.49 (3.3–6.09)
⩾5 years 24 8.91 2.69 (1.8–4.02)

Abbreviations: CI=confidence interval; SIR=standardized incidence ratio.