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Table 5 SIR values(95%CI) in relation to overall cancer incidence and some selected tumour types and laterality and bilaterality at diagnosis of gynecomastia. Included are only prospective cases.

From: Male gynecomastia and risk for malignant tumours – a cohort study

  Gynecomastia
  Unilateral right Bilateral left
Tumour type    
all sites 1.22(0.89–1.71) 0.90(0.60–1.31) 0.87(0.35–1.79)
testicle 4.03(0.10–22.97) 9.26(1.12–33.47) 0.00(0.00–71.05)
esophagus 6.11(0.74–22.08) 0.00(0.00–10.22) 10.33(0.26–57.55)
skin cancer (melanoma excl.) 2.44(0.67–6.29) 4.18(1.80–8.24) 1.99(0.05–11.06)
number 196 194 55
personyears 3588 3910 878