Original Articles
Copyright ©The Author(s) 1999. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Gastroenterol. Feb 15, 1999; 5(1): 53-56
Published online Feb 15, 1999. doi: 10.3748/wjg.v5.i1.53
Congenital expression of mdr-1 gene in tissues of carcinoma and its relation with pathomorphology and prognosis
Li-Jian Zhang, Ke-Neng Chen, Guang-Wei Xu, Hai-Ping Xing, Xiao-Tian Shi
Li-Jian Zhang, Ke-Neng Chen, Guang-Wei Xu, Department of Thoracic Surgery, the School of Oncology, Beijing Medical University, Beijing 100036, China
Hai-Ping Xing, Xiao-Tian Shi, Anyang Cancer Hospital, Anyang 455000, Henan Province, China
Ke-Neng Chen, male, born on 1963-04-30 in Lanzhou City, Gansu Province, graduated from Hubei Medical University, now asso-ciate professor and Ph. D., engaged in thoracic surgery, especially esophageal cancer, having 60 papers published.
Author contributions: All authors contributed equally to the work.
Supported by a grant from Science and Technology Committee of Henan Province, No.971200101.
Correspondence to: Ke-Neng Chen, Thoracic Department, the School of Oncology, Beijing Medical University, No.52 Fucheng Road, Beijing 100036, China
Received: November 9, 1998
Revised: November 27, 1998
Accepted: December 16, 1998
Published online: February 15, 1999

AIM To detect the congenital expression patterns of mdr-1 gene in commonly encountered malignant tumors in clinic, and the relationship between the expression of mdr-1 gene and the prognostic morphology in esophageal carcinomas.

METHODS A total of 151 resected samples of malignant tumors without preoperative treatment were taken from Anyang City Tumor Hospital. The congenital expression of their mdr-1 gene was detected with reverse transcripti on polymerase chain reaction (RT-PCR) and was compared with each other. The positive incidence of mdr-1 gene in 46 samples of esophageal carcinoma was compared with their differentiated grades, TNM stages and macroscopic types, and the precautions and advantages of RT-PCR were evaluated.

RESULTS All the 151 samples were confirmed to be malignant histopathologically, including cancers of stomach and gastric cardia (n = 51), esophagus (n = 46), colorectum (n = 16), breast (n = 15), thyroid (n = 10), lung (n = 9) and uterine cervix (n = 24). The positive expression rate of their mdr-1 gene was 33.3%, 37%, 31.3%, 13.2%, 40%, 55%, and 0% respectively. All the 46 samples of esophageal carcinoma were pathologically confirmed to be squamous cell carcinoma. The total expression rate of their mdr-1 gene was 37% (17/46), 35% (6/17), 40% (8/20), and 33% (3/9) for differentiation grade I, II and III respectively. The expression rate of TNM classification was 33% (6/18), 40% (5/12) and 37% (6/16) in stage IIa, IIb and III. The expression rate was 33% (3/9) in ulcerous type, 37% (3/8) in constrictive types, 33% (5/15) in fungoid types, and 40% (6/14) in medullary types. No statistically significant difference was found.

CONCLUSION Compared with other methods, RT-PCR is more simple, reliable and accurate in detecting mdr-1 gene expression in tissues of tumor. The overexpression of mdr-1 gene in these neoplasms suggested that cases should be handled differently for chemotherapy with rational use of drugs. Excision is the chief treatment for carcinoma of esophagus. The expression of mdr-1 gene in tissues of esophageal cancer is correlated with the parameters of tumor molecular biology which are independent of histopathological mor phology.

Keywords: neoplasm, multidrug resistance, gene expression/ mdr-1 gene, surgery, esophageal neoplasms