He reminded us that it is now ten years since attention was drawn to the increased risk of developing leukemia run by the mongol. He pointed out that mongolism is due to nondisjunction of a small auto- some, probably chromosome 21; and of course, it is known that one form of leukemia is associated with abberrations of this same chromosome. Then he reminded us that Wilms' tumor, an uncommon cancer, is fre- quently associated with equally uncommon congenital abnormalities, a highly significant association of unusual events.
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