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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 1996 Sep;87(9):995–1000. doi: 10.1111/j.1349-7006.1996.tb02131.x

Localization of Small‐cell Lung Cancer Xenografts with Iodine‐125‐, Indium‐111‐, and Rhenium‐188‐Somatostatin Analogs

Makoto Hosono 1,✉, Masako N Hosono 2, Thomas Haberberger 3, Paul O Zamora 4, Stefan Guhlke 3, Hans Bender 3, F F Russ Knapp 5, Hans J Biersack 3
PMCID: PMC5921201  PMID: 8878464

Abstract

We examined the potential of radiolabeled somatostatin analogs, 125I‐Tyr‐3‐octreotide (125I‐octreotide), 111In‐DTPA(diethylenetriaminepentaacetatic acid)‐d‐Phe‐1‐octreotide (111In‐octreotide), and 188Re‐octreotide for targeting small‐cell lung cancer (SCLC) in a mouse model. Tyr‐3‐octreotide was labeled with 125I by the chloramine T method, and 111In‐octreotide was obtained as a kit, while 188Re was eluted from a 188W/188Re generator, and octreotide was directly labeled with 188Re by reducing disulfide bonds. The 125I‐, 111In‐, and 188Re‐octreotides were injected i.v. into athymic mice bearing NCI‐H69 tumors, and the biodistributions were determined at 15 min, and 2, 4, 8, and 24 h. Tumor uptakes were 0.5±0.2, 0.3±0.1, 0.3±0.1 %ID/g, and tumor‐to‐blood ratios were 1.8, 11.9, 1.2 at 8 h for 125I‐, 111In‐, and 188Re‐octreotides, respectively. Accumulations of 111In‐octreotide in normal tissues were lower than those of 125I‐ and 188Re‐octreotides. 188Re‐octreotide can be used to localize SCLC lesions as efficiently as radioiodinated octreotide. However, 111In‐octreotide was the most suitable agent to obtain high tumor‐to‐normal tissue contrast for localizing SCLC.

Keywords: Small‐cell lung cancer, Octreotide, Rhenium‐188, Xenograft

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