RESUMEN
Objective To explore the relationship between expression of MDR1 gene in human esophageal and cardiac cancer and clinicopathological changes. Methods From Jan 2 000 to Dec 2001, a total of 161 patients with esophageal or cardiac carcinoma were recruited, and MDR1 were assayed by RT-PCR. Fresh tumor tissues were surgically resected without chemotherapy before operation. Results The positive rate of MDR1 was 34.78 % (56/161). Among them 5 cm 38.54 %, invasion to muscular layer 30.77 %, invasion to tunica serosa 35.14 %, squamous cell carcinoma 27.27 %, adenocarcinoma 41.67 %, lymphonode metastasis positive 35.19 %, negative 33.96 %, stage Ⅰ,Ⅱ 33.33 %, stage Ⅲ, Ⅳ 35.58 %. The correlation between MDR1 expression and the age and sex of patients, Tumor size depth of invasion histologic types lymph node involvement and TNM, was not significant. Conclusion Because of highly expressive level of MDR1 gene in untreated esophageal and cardiac carcinoma, we should choose appropriate chemotherapeutic regimen for esophageal and cardiac cancer. The expression of MDR1 gene in untreated cancer was independented of morphologic prognostic indexes without correlation between MDR1 gene expression and morphological indexes.