PURPOSE: KL-6 is an extracellular epitope of MUC1, a membrane-penetrating glycoprotein, and its overexpression has been reported in pancreatic cancer. The aim of this study was to examine whether radiolabeled anti-KL-6/MUC1 antibody could be used for molecular imaging of pancreatic cancer in vivo. MATERIALS AND METHODS: Anti-KL-6/MUC1 antibody was labeled with 99mTC by the stannous reduction method. Immunoreactivity of the 99mTc-labeled anti-KL-6/MUC1 antibody was evaluated by a whole-cell binding study. In vivo experiments were performed by injecting the 99mTc-labeled anti-KL-6/MUC1 antibody into athymic nude mice bearing the KP-1NL pancreatic cancer cell line. RESULTS: A whole-cell binding study showed that the radiolabeled antibody retained its immunoreactivity. On scintigrams, the density of the tumors remained unchanged during the 16-32 h after injection, whereas that of the kidneys decreased time-dependently. The radioactivity levels of the kidneys and tumors were measured densitometrically, and we found that the intensity in the tumors relative to that in the kidneys increased time-dependently. Radioactivity levels were the highest in the blood 32 h after injection, and those in the liver, kidney, lung, and tumor were also rather high. CONCLUSION: 99mTc-labeled anti-KL-6/MUC1 antibody appears to be a promising agent as a tumor-specific radiotracer for pancreatic cancer.
PURPOSE: KL-6 is an extracellular epitope of MUC1, a membrane-penetrating glycoprotein, and its overexpression has been reported in pancreatic cancer. The aim of this study was to examine whether radiolabeled anti-KL-6/MUC1 antibody could be used for molecular imaging of pancreatic cancer in vivo. MATERIALS AND METHODS: Anti-KL-6/MUC1 antibody was labeled with 99mTC by the stannous reduction method. Immunoreactivity of the 99mTc-labeled anti-KL-6/MUC1 antibody was evaluated by a whole-cell binding study. In vivo experiments were performed by injecting the 99mTc-labeled anti-KL-6/MUC1 antibody into athymic nude mice bearing the KP-1NL pancreatic cancer cell line. RESULTS: A whole-cell binding study showed that the radiolabeled antibody retained its immunoreactivity. On scintigrams, the density of the tumors remained unchanged during the 16-32 h after injection, whereas that of the kidneys decreased time-dependently. The radioactivity levels of the kidneys and tumors were measured densitometrically, and we found that the intensity in the tumors relative to that in the kidneys increased time-dependently. Radioactivity levels were the highest in the blood 32 h after injection, and those in the liver, kidney, lung, and tumor were also rather high. CONCLUSION: 99mTc-labeled anti-KL-6/MUC1 antibody appears to be a promising agent as a tumor-specific radiotracer for pancreatic cancer.
Authors: A Sendler; N Avril; H Helmberger; J Stollfuss; W Weber; F Bengel; M Schwaiger; J D Roder; J R Siewert Journal: World J Surg Date: 2000-09 Impact factor: 3.352
Authors: Y Karube; K Katsuno; J Takata; K Matsunaga; M Haruno; M Kuroki; F Arakawa; Y Matsuoka; H Kanda Journal: Nucl Med Biol Date: 1996-08 Impact factor: 2.408
Authors: Marleen van Oosten; Lucia Ma Crane; Joost Bart; Fijs W van Leeuwen; Gooitzen M van Dam Journal: Transl Oncol Date: 2011-04-01 Impact factor: 4.243