| incidence of childhood cancer in twins. | the incidence of childhood cancer in twins was evaluated by linking a roster of 30,925 twins born in connecticut (united states) between 1930 and 1969 with the connecticut tumor registry. cancer, exclusive of nonmelanoma skin cancer, was identified in 19 females and 12 males under 15 years of age. the incidence rate among twins was 7.9 cancers per 100,000 person-years (py) overall, and 9.7 and 6.1 per 100,000 pys for females and males, respectively. four of 13 leukemias occurred in two female tw ... | 2007 | 1932544 |