Ongoing studies at the Hereditary Gastrointestinal Cancer Registry in Hong Kong have revealed a unique germline MSH2c.1452-1455delAATG mutation that has not been reported in other ethnic groups.
Forty-three women with HNPCC were counseled through a gastrointestinal cancer risk program, and later sent a questionnaire regarding their screening practices for gynecologic neoplasms.
The c.1168C>T (p.Leu390Phe), c.1255C>A (p.Gln419Lys), and c.1261C>A (p.Leu421Met) in exon 7 and c.518T>G (p.Leu173Arg) in exon 3 of MSH2 were suspected as predisposing to gastrointestinal cancer.
Cancer data from 1980 to 2007 were obtained from the Familial Gastrointestinal Cancer Registry in Toronto for 321 persons with known MMR mutations: mutL homolog 1, colon cancer, nonpolyposis type 2 (E. coli) (MLH1); mutS homolog 2, colon cancer, nonpolyposis type 1 (E. coli) (MSH2); mutS homolog 6 (E. coli) (MSH6); and PMS2 postmeiotic segregation increased 2 (S. cerevisiae) (PMS2).