This paper describes recent studies on cancer incidence among Japanese
atomic bomb survivors. The report includes a brief description of the
primary atomic bomb survivor cohorts. The results illustrate the magn
itude of the excess risks and show how these risks vary with sex, age
at exposure and time. Descriptions are presented in terms of both exce
ss relative risks and excess absolute rates. The paper also includes a
summary of the current status of research on biomarkers of radiation
exposure in the atomic bomb survivors.