Web Table 3. Breast Cancers According to the Mean Radiation Dose to the Breast in a Cohort of 1,814 Patients Treated for a First Cancer During Childhood

Types of First Cancer Radiation Dose to Any Breast (Gy)
No Radiation or < 1 ≥ 1
Neuroblastoma or Hodgkin’s disease
    Average dose to breast, Gy 0.3 9.3
    No. with breast cancer 1 6
    No. of breasts 405 393
    SIR{dagger} 10.0 80.6
    90% CI 4.3 to 19.4 32.0 to 163.4
Others
    Average dose to breast, Gy 0.3 10.2
    No. with breast cancer 7 2
    No. of breasts 2,018 812
    SIR* 20.7 11.3
    90% CI 1.2 to 91.3 1.7 to 34.8

Abbreviation: SIR, standardized incidence ratio.

* Compared with the general population at a same attained age.