FLCN gene-mutated renal cell neoplasms: Mother and daughter cases with a novel germline mutation

Abstract

Birt-Hogg-Dubé syndrome is a familial genodermatosis, of which patients frequently develop renal neoplasms, fibrofolliculomas and pneumatocele. Here, we report a mother and daughter with renal neoplasms surgically resected (69 and 46years-of-age at surgery, respectively). The mother's tumor was diagnosed as an unclassified type renal cell carcinoma associated with microscopic tumorous nodules, whereas the daughter's tumor was a hybrid oncocytic/chromophobe tumor. The germline mutation analysis of the responsible gene, FCLN (the folliculin gene), showed a deletion of 18bp in exon5 (c.332_349del/p.H111_Q116del), predicting an alteration of the amino acid sequence of "HPSHPQ" replaced by a single amino acid, "L". This is a novel germline mutation of the FCLN gene that has not been previously reported. © 2011 The Japanese Urological Association.