Volume 62 - 1999 - Fasc.1 - Original articles
Colorectal villous tumors: Accuracy of the preoperative biopsies
This study was undertaken to assess the reliability of the endoscopic biopsies in the evaluation of colorectal villous tumors (CRVT). In 163 consecutive patients referred for surgical treatment of CRVT, preoperative evaluation had been routinely done by colonoscopy and multiple biopsies. Tumors were classified in 3 groups : low grade tumors, high grade tumors and adenocarcinomas. @itration in depth was staged on the postoperative specimens according to the Dukes-Astler-Coller's classification. All the tumors were completely resected by surgery and definitive pathological diagnosis was established. An exact correlation between the pre- and postoperative staging was observed in 48% of the cases. Accuracy averaged 54% in the giroup-by-giroup comparison, with an overstaging rate of 6.7%, and an understaging rate of 39%. The incidence of adenocarcinomas was 22% in the group with clearly benign preoperative biopsies and 50% in the other cases. There were significantly more B2 and C tumors among the patients referred after 3 or more endoseopic attempts (33%) than after one or two sessions (10%) (p < 0.0003). We confirm that in spite of multiple endoscopic biopsies, only a complete resection permits an exact staging and an appropriate therapeutic choice.
Prevalence of hepatitis G virus in a haemodialysis unit
Influence of body mass index, sex and age on serum alanine aminotransferase (ALT) level in healthy blood donors
Background and aim: Serum alanine aminotransferase (ALT) level is the most common screening test as part of a routine evaluation of liver damage. In order to determine the factors influencing this liver function test in normal subjects, the relationship between ALT level and gender, age and body mass index (BMI) was studied in a large population of healthy blood donors. Methods: This population included 9,420 volunteer blood donors (4,488 men and 4,932 women aged from 18 to 70 years) selected on the basis of negative answers to a detailed medical questionnaire including past medical history, drug and alcohol consumption, on the absence of clinical signs of liver disease, on the negativity of serological testing for hepatitis B and C virus and HIV. Results: In the overall population, the mean serum ALT value was 21.8 I.U./L and the mean BMI was 24.4 kg/m2. There was a positive significant correlation between serum ALT level and BMI (Pearson r = 0.54 ; p < 0.001) and between ALT and age (Pearson r = 0.25 ; p < 0.001). A major sex-difference in ALT value was observed, the mean ALT value being higher in men than in women (26.8 ± 13.6 vs. 17.2 ± 8.1 I.U./L, p < 0.0001). In both sexes, ALT level was significantly correlated with BMI (Pearson r = 0.45 in men and r = 0.37 in women; p < 0.001). In women a consistent rise in BMI and ALT value with increasing age was observed whereas in men BMI and ALT level only increased with age up to the fifth decade. In conclusion, there was a significant positive correlation between ALT and BMI regardless the gender in a population of healthy volunteer blood donors. Moreover, at the same age and the same BNH, ALT was significantly lower in women than in men suggesting that the normal range for ALT value should be adjusted for gender. So gender and BNH have to be considered in the interpretation of ALT values.