Mortality and Cancer Frequency Among Military Nuclear Test (Smoky) Participants

To the Editor.— In analyzing their data concerning follow-up of nuclear test participants and in drawing their conclusions, Caldwell et al1 have failed to take account of current knowledge of the epidemiology of human radiation exposure. It is known that the bone marrow has a high relative sensitivity to the induction of cancer and that leukemias may appear within five years of radiation exposure; solid tumors, however, generally appear later, …