Nonlinkage of 16q markers to familial predisposition to Wilms' tumor.

Wilms' tumor (WT), a childhood cancer of the kidney, occurs in both familial and sporadic forms. Chromosome 11 genes have been implicated in the etiology of WT, and mutations in a gene at chromosomal band 11p13, WT1, have been identified in a few WT cases. However, 11p13 has been excluded as the site of the predisposition mutation segregating in several large WT families, which implies the existence of a non-11p familial predisposition gene. Recently, loss of heterozygosity for 16q markers located between chromosomal bands 16q13 and 16q22 has been reported in approximately 20% of sporadic Wilms' tumors. To determine if this region of 16q harbors the non-11p familial WT gene, a genetic linkage study of five WT families was undertaken. Using multipoint analyses, we ruled out genetic linkage of familial WT predisposition to 16q.