title: APC mutations in synovial sarcoma.
abstract: It has previously been demonstrated that accumulated beta-catenin serves as an oncoprotein in synovial sarcoma and results in a poor overall survival rate, but the frequency of beta-catenin mutation was quite low (8.2%). The present study, using essentially the same study group of cases, screened for genetic alterations in the mutation cluster region (MCR) of the APC gene in 49 cases of synovial sarcoma. SSCP analysis followed by DNA direct sequencing revealed five missense APC mutations in four cases of synovial sarcoma (8.2%). The mutational sites comprised one case each at codons 1299 (GCT to ACT, Ala to Thr), 1412 (GGA to AGA, Gly to Arg), and 1414 (GTA to ATA, Val to Ile), in addition to one case with double point mutations at codon 1398 (AGT to AAT, Ser to Asn) and at codon 1413 (ATG to ATA, Met to Ile), together with beta-catenin mutation at codon 32 (GAC to TAC, Asp to Tyr). All four cases with APC mutations were histologically of the monophasic fibrous type and showed beta-catenin accumulation. All three cases with APC mutations available for follow-up data were long survivors. This study provides the first evidence that APC mutations also occur in the field of sarcoma, especially in synovial sarcoma.
authors.affiliation: Department of Anatomic Pathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Saito
authors.forename: Yoshinao
authors.initials: Y
authors.lastname: Oda
authors.forename: Akio
authors.initials: A
authors.lastname: Sakamoto
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Kawaguchi
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Tanaka
authors.forename: Shuichi
authors.initials: S
authors.lastname: Matsuda
authors.forename: Sadafumi
authors.initials: S
authors.lastname: Tamiya
authors.forename: Yukihide
authors.initials: Y
authors.lastname: Iwamoto
authors.forename: Masazumi
authors.initials: M
authors.lastname: Tsuneyoshi
mesh_terms: D000328:Adult; D002648:Child; D003598:Cytoskeletal Proteins / Q000235:genetics / Q000378:metabolism; D004252:DNA Mutational Analysis; D004273:DNA, Neoplasm / Q000235:genetics; D005260:Female; D005500:Follow-Up Studies; D017491:Genes, APC; D006801:Humans; D008297:Male; D008875:Middle Aged; D020125:Mutation, Missense; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism; D018807:Polymorphism, Single-Stranded Conformational; D011379:Prognosis; D013584:Sarcoma, Synovial / Q000235:genetics* / Q000378:metabolism; D015996:Survival Rate; D015534:Trans-Activators; D051176:beta Catenin
chemical_list: C495270:CTNNB1 protein, human; D003598:Cytoskeletal Proteins; D004273:DNA, Neoplasm; D009363:Neoplasm Proteins; D015534:Trans-Activators; D051176:beta Catenin