As in other parts of the world,1,2 we, in Israel, have been impressed by an apparent increase in the incidence of leukemia in recent years.
The immigrant population of Israel, which came in well-defined waves from many different countries mainly after 1948, provides material for the study of the incidence of leukemia in different ethnic groups. Furthermore, the differences in medical sophistication of their countries of origin and the mass-treatment programs linked to specific groups of immigrants make it possible to investigate some of the etiologic factors involved in this disease.
This communication presents observations based on a study of leukemia mortality in Israel during the years 1950-1958 and of 150 consecutive leukemia patients seen at a large central hospital.
Information was obtained from the following 2 sources:
All the certificates of the 718 registered leukemic deaths reported to the Central Bureau of Statistics* during the years