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Sarroca C, Della Valle A, Fresco R, Renkonen E, Peltömaki P, Lynch HT. Frequency of hereditary non-polyposis colorectal cancer among Uruguayan patients with colorectal cancer.Few studies have investigated the frequency of hereditary non-polyposis colorectal cancer (HNPCC) in patients with colorectal cancer (CRC), and these have shown marked geographic variations. The aim of this study was to estimate the frequency of HNPCC in a cohort of Uruguayan CRC patients. We included all patients operated consecutively for CRC in the Hospital Central de las Fuerzas Armadas (Uruguay) between 1987 and 2003. Cases were classified into three groups: (i) those fulfilling Amsterdam criteria; (ii) those not fulfilling Amsterdam criteria but considered as a population at increased risk of cancer; and (iii) sporadic CRC. Genetic analysis to detect point mutations inhMLH/hMSH2/hMSH6genes was performed in group 1 patients. Cases not showing mutations were tested by multiplex ligation-dependent probe amplification. Among 461 patients, group 1 represented 2.6%, group 2 represented 5.6%, and sporadic cases 91.8%.hMLH1/hMSH2/hMSH6mutations were found in 25% of cases classified as HNPCC (two inhMLH1and one inhMSH2). No mutations were detected inhMSH6gene. The proportion of CRC patients that fulfilled Amsterdam criteria agrees with other reports. However, the percentage of HNPCC cases with identified mutations (25%) may be lower than that reported from other populations. This may reflect, among other possible causes, a different genetic profile in the Uruguayan population. [ABSTRACT FROM AUTHOR]