Abstract
A total of 101 unrelated patients affected by colorectal cancer or an HNPCC associated cancer (endometrium, small bowel, urinary tract) were from 17 families which fulfilled the Amsterdam II criteria12 and from 84 families matching our modified criteria of suspected HNPCC, one colorectal cancer patient with a first degree relative affected by an HNPCC associated cancer, one of whom was diagnosed under the age of 50 years.13 The clinical diagnosis of HNPCC was established or verified at the Hereditary Cancer Centre, Pomeranian Academy of Medicine, Szczecin, Poland. Patients used for this study were ascertained from the following regions: Bydgoszcz (3), Gdańsk (3), Kielce (14), Kraków (3), Legnica (1), Lublin (2), Lódz (1), Olsztyn (13), Poznań (7), Riga (3), Szczecin (33), Tartu (3), Wrocław (5), Vilnius (6), Zielona Góra (4).

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