Stem cell factor receptor (c-KIT) codon 816 mutations predict development of bilateral testicular germ-cell tumors.
Testicular germ-cell tumors (TGCTs) of adolescents and adults originate from intratubular germ cell neoplasia (ITGCN), which is composed of the malignant counterparts of embryonal germ cells. ITGCN cells are characterized, among others, by the presence of stem cell factor receptor c-KIT. Once established, ITGCN will always progress to invasiveness. Approximately 2.5-5% of patients with a TGCT will develop bilateral disease and require complete castration, resulting in infertility, a need for lifelong androgen replacement, and psychological stress. To date, the only way to predict a contralateral tumor is surgical biopsy of the contralateral testis to demonstrate ITGCN. We did a retrospective study of 224 unilateral and 61 proven bilateral TGCTs (from 46 patients, in three independently collected series in Europe) for the presence of activating c-KIT codon 816 mutations. A c-KIT codon 816 mutation was found in three unilateral TGCT (1.3%), and in 57 bilateral TGCTs (93%; P < 0.0001). In the two wild-type bilateral tumors for which ITGCN was available, the preinvasive cells contained the mutation. The mutations were somatic in origin and identical in both tumors. We conclude that somatic activating codon 816 c-KIT mutations are associated with development of bilateral TGCT. Detection of c-KIT codon 816 mutations in unilateral TGCT identifies patients at risk for bilateral disease. These patients may undergo tailored treatment to prevent the development of bilateral disease, with retention of testicular hormonal function.
Looijenga
Leendert H J
LH
Pathology/Laboratory for Experimental Patho-Oncology, Erasmus MC, University Medical Center Rotterdam, den Hoed Cancer Center, Nefkens Institute, Building Be, Room 430b, Dr. Molewaterplein 50, 3015 GE Rotterdam, the Netherlands. L.Looijenga@erasmusmc.nl
de Leeuw
Hubert
H
van Oorschot
Monique
M
van Gurp
Ruud J H L M
RJ
Stoop
Hans
H
Gillis
Ad J M
AJ
de Gouveia Brazao
Carlos A
CA
Weber
Rob F A
RF
Kirkels
Wim J
WJ
van Dijk
Thamar
T
von Lindern
Marieke
M
Valk
Peter
P
Lajos
Geczy
G
Olah
Edit
E
Nesland
Jahn M
JM
Fosså
Sophie D
SD
Oosterhuis
J Wolter
JW
D000328:Adult; D003062:Codon / Q000235:genetics*; D004273:DNA, Neoplasm / Q000097:blood / Q000235:genetics; D020022:Genetic Predisposition to Disease; D018237:Germinoma / Q000235:genetics* / Q000473:pathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009154:Mutation; D016133:Polymerase Chain Reaction / Q000379:methods; D019009:Proto-Oncogene Proteins c-kit / Q000235:genetics*; D018239:Seminoma / Q000235:genetics; D013736:Testicular Neoplasms / Q000235:genetics* / Q000473:pathology
D003062:Codon; D004273:DNA, Neoplasm; D019009:Proto-Oncogene Proteins c-kit