Sentinel lymph node mapping of the colon and stomach using lymphoseek in a pig model

Annals of Surgical Oncology
Scott J EllnerAnne M Wallace

Abstract

Lymphoseek is a radiopharmaceutical designed for sentinel lymph node (SLN) mapping. The purpose of this study was to compare Lymphoseek colon and gastric pharmacokinetics with filtered [(99m)Tc]sulfur colloid (fTcSC). Eight anesthetized pigs received an endoscopic injection of Lymphoseek or fTcSC in the stomach and colon. Scintigraphy was obtained of both administration sites at 15-minute intervals up to 3 hours after injection, after which all SLNs were identified by a handheld gamma probe through a laparotomy incision. Isosulfan blue was administered at the injection site 5 minutes before SLN mapping. The percentage of injected dose (%ID) was measured for all harvested nodes, and the clearance half-life (T(c)) was calculated for all injection sites. The mean Lymphoseek clearance for colon (T(c), 2.56 +/- 1.04 hours) and gastric (T(c), 3.83 +/- 1.18 hours) injection sites was statistically faster (P =.030) compared with fTcSC (colon T(c), 14.98 +/- 3.41 hours; stomach T(c), 14.52 +/- 4.08 hours). After 3 hours, Lymphoseek exhibited a mean SLN %ID of 1.32% +/- 1.71% in the colon and 2.04% +/- 2.12% in the stomach; this was not statistically different from fTcSC (colon,.63% +/-.39%; stomach, 2.35% +/- 2.90%). SLN uptake of Lymph...Continue Reading

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Mar 27, 2007·International Journal of Biological Sciences·Joan K Lunney
Feb 19, 2011·Annals of Surgical Oncology·Stanley P L LeongRichard C Orahood
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