Abstract
To identify the reason for age and gender differences in cancer risk. Age-standardized incidence rates for 17 cancer types were compared between genders in 50 populations. For each cancer type, the female/male rate ratio was listed in fixed order of population. Correlation coefficients were calculated between these lists in all pairwise combinations. For each population, the female/male rate ratio was listed in fixed order of cancer. Correlation coefficients were calculated between lists in all pairwise combinations. Only four pairwise combinations for cancer type gave a correlation coefficient greater than 0.700. For each population, the lowest correlation coefficient was 0.950. The reason for the differences in risk of cancer varies with each type of cancer, but remains fixed in all populations. It is suspected that species-specific genes control stem cell telomere dynamics in a fixed strategy at rates that vary among tissues and between genders.
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