title: [Familial colorectal cancer type X: clinical, pathological and molecular characterization].
abstract: BACKGROUND
  Some families fulfilling the Amsterdam Criteria (AC) differ from the Lynch syndrome (LS) in that colorectal cancers (CRC) do not present microsatellite instability (MSI) and DNA mismatch repair gene mutations are not found. These families have been designated as Familial Colorectal Cancer type X (XS) and their genetic basis remains unknown.
  
  
  OBJECTIVE
  In families fulfilling AC for LS: 1) To perform MSI testing in CRC and to correlate it with clinical and pathological characteristics and with the mutational analysis in the DNA mismatch repair genes; 2) In cases suggestive of XS, to study the suppressor pathway (SP) of carcinogenesis.
  
  
  METHODS
  45 patients with CRC, from 41 families fulfilling AC, were included. Clinical and pathological data were recorded. MSI testing was performed with the Bethesda marker panel and mutational analysis in MLH1, MSH2 and MSH6 genes was undertaken by DGGE, MLPA and direct sequencing. To study the SP, loss of heterozigoty was evaluated at the following loci: APC, p53, DCC and SMAD4 genes.
  
  
  RESULTS
  33/41 (80%) and 8/41 (20%) families presented high-grade microsatellite instability (MSI-H) and microsatellite stable (MSS) CRC, respectively. In families suggestive of XS, a smaller number of CRC and less frequent spectrum associated tumors were detected. In comparison with MSI-H CRC, MSS CRC were preferentially located at the distal colon/rectum and less often presented mucous production or lymphocytic infiltrate. In 70% of families with MSI-H CRC, a pathogenic mutation in one of the DNA mismatch repair genes was identified, as opposed to none in the group with MSS CRC. The SP was followed in 2 cases and an alternative one in other two. The remaining 4 cases were noninformative; however, 5/8 (63%) presented allelic losses in the APC gene.
  
  
  CONCLUSIONS
  1) Families fulfilling AC and harbouring MSS CRC presented particular characteristics, which reinforce the existence of a new entity, different from LS; 2) The designation of Familial Colorectal Cancer type X seems appropriate to classify an entity whose CRC follow an unclear carcinogenesis pathway and that presents an unknown genetic basis; 3) The designation of LS should be restricted to families with an identified pathogenic DNA mismatch repair gene mutation.
authors.affiliation: Instituto Português de Oncologia, Lisboa.
authors.forename: Sara
authors.initials: S
authors.lastname: Ferreira
authors.forename: Pedro
authors.initials: P
authors.lastname: Lage
authors.forename: Rita
authors.initials: R
authors.lastname: Sousa
authors.forename: Isabel
authors.initials: I
authors.lastname: Claro
authors.forename: Inês
authors.initials: I
authors.lastname: Francisco
authors.forename: Bruno
authors.initials: B
authors.lastname: Filipe
authors.forename: Alexandra
authors.initials: A
authors.lastname: Suspiro
authors.forename: Paula
authors.initials: P
authors.lastname: Chaves
authors.forename: Paula
authors.initials: P
authors.lastname: Rodrigues
authors.forename: Cristina
authors.initials: C
authors.lastname: Albuquerque
authors.forename: C
authors.initials: C
authors.lastname: Nobre Leitão
mesh_terms: D000328:Adult; D000368:Aged; D015179:Colorectal Neoplasms / Q000175:diagnosis / Q000235:genetics*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged