Original Articles
Copyright ©The Author(s) 1998. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Gastroenterol. Aug 15, 1998; 4(4): 303-306
Published online Aug 15, 1998. doi: 10.3748/wjg.v4.i4.303
Radioimmunoimaging of colorectal cancer using 99mTc-labeled monoclonal antibody
Jin-Yue Hu, Jian-Zhi Su, Zhi-Ming Pi, Jian-Gao Zhu, Guo-Hua Zhou, Qu-Bing Sun
Jin-Yue Hu, Jian-Gao Zhu, Guo-Hua Zhou, Qu-Bing Sun, The Institute of Cancer Research, Hunan Medical University, Changsha 410078, Hunan Province, China
Jian-Zhi Su, Department of Nuclear Medicine, the Second Affiliated Hospital, Hunan Medical University, Changsha 410011, Hunan Province, China
Zhi-Ming Pi, Department of Surgery, the Second Affiliated Hospital, Hunan Medical University, Changsha 410011, Hunan Province, China
Jin-Yue Hu, male, born on 1966-07-30 in Hunan Province, graduated from Hunan Medical University as a postgraduate in 1995, now lecturer major in tumor immunology.
Author contributions: All authors contributed equally to the work.
Correspondence to: Jin-Yue Hu, the Institute of Cancer Research, Hunan Medical University, Changsha 410078, Hunan Province, China
Received: January 20, 1998
Revised: February 24, 1998
Accepted: April 8, 1998
Published online: August 15, 1998
Abstract

AIM: To determine whether Hb3 and its fragment F(ab’)2 have practical value in radioimmunoimaging of colorectal cancer.

METHODS: Intact Hb3 was purified by hydroxylapatite chromatography. The fragment F(ab’)2 was prepared by cold digestion and purified as intact Hb3. Hb3 and its fragment F(ab’)2 were labeled with 99mTc by direct labeling method using SnCl2 as reducing agent. The radioactive doses ranged from 15 to 40 mCi. The imaging was accomplished by single photon emission computered tomograph (SPECT) with imaging time ranging from 2.5 to 48 h. In this study, 10 patients were selected. Among them, 7 were administered with intact Hb3, and 3 with F(ab’)2 fragment. All the patients were diagnosed as having colorectal adenocarcinoma.

RESULTS: After purification, intact Hb3 and its fragment F(ab’)2 were fit for radioimmunoimaging. The percentage of labeling of 99mTc to Hb3 or F(ab’)2 was 80.6%-91.5%. Among the 10 patients, 3 of 7 patients administered with intact Hb3 had positive scans, the other 4 had negative scans, and 2 of 3 patients administered with F(ab’)2 had positive scans, the other 1 had negative scans.

CONCLUSION: The results showed that both intact Hb3 and its F(ab’)2 have some practical value in radioimmunoimaging of colorectal cancer, and the effects of imaging with F(ab’)2 was better than that with intact Hb3.

Keywords: colorectal neoplasms/ radioimmunoimaging; antibody, monoclonal; isotope labeling; technium/diagnostic use