Other previously reported associations with cancer have not been reproduced in this study, namely, multiple myeloma (, 9, 10), Hodgkin's disease (8), and cancer of the brain (8). However, the cohort is still young (table 2), including only 6 percent of the number of cancers expected at extinction (32), and the average follow-up time (14 years) is short. Updates on this study may be powerful enough to detect some of these associations. For example, the excess relative risk for Hodgkin's disease is large in males and females combined. The large confidence interval, extending below 0, is caused by the lack of sufficient cases with high doses