TP53 germline mutation testing in 180 families suspected of Li-Fraumeni syndrome: mutation detection rate and relative frequency of cancers in different familial phenotypes.
BACKGROUND Li-Fraumeni syndrome (LFS) is a rare autosomal dominant cancer predisposition syndrome. Most families fulfilling the classical diagnostic criteria harbour TP53 germline mutations. However, TP53 germline mutations may also occur in less obvious phenotypes. As a result, different criteria are in use to decide which patients qualify for TP53 mutation analysis, including the LFS, Li-Fraumeni-like (LFL) and Chompret criteria. We investigated which criteria for TP53 mutation analysis resulted in the highest mutation detection rate and sensitivity in Dutch families. We describe the tumour spectrum in TP53-positive families and calculated tumour type specific relative risks. METHOD A total of 180 Dutch families referred for TP53 mutation analysis were evaluated. Tumour phenotypes were verified by pathology reports or clinical records. RESULTS A TP53 germline mutation was identified in 24 families. When the Chompret criteria were used 22/24 mutations were detected (sensitivity 92%, mutation detection rate 21%). In LFS and LFL families 18/24 mutations were found (sensitivity 75%). The two mutations detected outside the 'Chompret group' were found in a child with rhabdomyosarcoma and a young woman with breast cancer. In the mutation carriers, in addition to the classical LFS tumour types, colon and pancreatic cancer were also found significantly more often than in the general population. CONCLUSION We suggest TP53 mutation testing for all families fulfilling the Chompret criteria. In addition, TP53 mutation testing can be considered in the event of childhood sarcoma and breast cancer before 30 years. In addition to the risk for established LFS tumour types, TP53-positive individuals may also have an elevated risk for pancreatic and colon cancer.
Family Cancer Clinic, The Netherlands Cancer Institute, Amsterdam, The Netherlands.
Marielle W G
MW
Ruijs
Senno
S
Verhoef
Matti A
MA
Rookus
Roelof
R
Pruntel
Annemarie H
AH
van der Hout
Frans B L
FB
Hogervorst
I
I
Kluijt
Rolf H
RH
Sijmons
Cora M
CM
Aalfs
Anja
A
Wagner
Margreet G E M
MG
Ausems
Nicoline
N
Hoogerbrugge
Christi J
CJ
van Asperen
Encarna B
EB
Gomez Garcia
Hanne
H
Meijers-Heijboer
Leo P
LP
Ten Kate
Fred H
FH
Menko
Laura J
LJ
van 't Veer
D000328:Adult; D003110:Colonic Neoplasms / Q000175:diagnosis / Q000235:genetics; D004252:DNA Mutational Analysis; D005192:Family Health; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005820:Genetic Testing / Q000379:methods; D005838:Genotype; D018095:Germ-Line Mutation; D006801:Humans; D016864:Li-Fraumeni Syndrome / Q000175:diagnosis / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000175:diagnosis / Q000235:genetics*; D009426:Netherlands; D010190:Pancreatic Neoplasms / Q000175:diagnosis / Q000235:genetics; D010641:Phenotype; D012307:Risk Factors; D016159:Tumor Suppressor Protein p53 / Q000235:genetics*; D055815:Young Adult
D016159:Tumor Suppressor Protein p53