Concomitance of different primary malignant neoplasms in the same individual has been observed and explained by several possible mechanisms. For urogenital malignancies in concomitance with lymphoid or with intestinal malignancies some data indicate that common etiologic factor(s) with pleiotropic effects may be involved. Concomitance of these particular different primary malignant neoplasms must therefore be kept in mind in the evaluation of patients' conditions.
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