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Plasma Soluble Vascular Adhesion Molecule-1 Levels Are Persistently Elevated During the First Month After Colorectal Cancer Resection

Introduction: Human Vascular Cell Adhesion Molecule -1(VCAM1) is a 110 kDa transmembrane glycoprotein expressed in vascular endothelial cells (EC), neurons, fibroblast and macrophages. Expression is regulated by inflammatory cytokines such as IL-1, TNFalpha, IL-4 and IL-13. Soluble VCAM-1 (sVCAM-1) is made when the extracellular part of VCAM-1 is shed from the cell surface into the circulation. The ligands for both are the alpha-4integrins. Ligand binding to EC bound VCAM-1 promotes leukocyte recruitment and extravasation whereas binding to sVCAM-1 promotes neovascularization, critical to both wound repair and tumor growth. Increased serum levels of sVCAM-1 has been found in patients with breast, ovarian and gastric cancers, however, the impact of surgery on sVCAM levels has not been determined in the cancer setting. This study’s purpose was to evaluate plasma levels of sVCAM-1 during the first month after minimally invasive colorectal resections (MICR).
Methods: Clinical, operative and demographic data was collected. Blood samples were taken preoperatively (PO) and postoperative day (POD) 1 and 3 in all patients. In a subset, sample(s) were taken 2-8 weeks after surgery. Late samples after POD 7 were bundled into 7 day time blocks which were considered as single time points. Plasma sVCAM-1 levels were analyzed in duplicate via ELISA and results reported as mean ±SD. The t-test was used for data analysis (significance<0.008 after Bonferroni correction)
Results: A total of 91 colorectal cancer (CRC) patients(pts) were studied (26% rectal, 74% colon). The MICR’s were laparoscopic-assisted in 60% and hand-assisted in 40%; the overall mean incision length was 7.4 ± 3.3 cm and mean length of stay was 6.0 ±; 2.2 days. The mean sVCAM-1 levels (ng /ml) were significantly higher on POD1 (903.5± 291.6 , p<0.001) and POD3 (976.9± 270.4, p<0.001) vs PO levels (808.9±233.0). Levels remained significantly elevated for the POD7-13 (959.8 ± 231.9; n=49, p< 0.001), POD14-20 (949.4± 309.8;n=30,p=0.004), POD 21-27 (816.4± 176.6;n=23,p=.001) and POD28+ (912.8± 261.2;n=53,p<0.001) time blocks.
Discussion: For the vast majority of proteins 1-3 day plasma level changes are noted post MICR. Plasma sVCAM-1 levels are elevated for over 1 month. Similarly persistent increases were noted for VEGF, Angiopetin2 and PLGF. The likely source of these proangiogenic proteins are the wounds. This environment may promote tumor growth post MICR inpts with residual cancer. Further study is needed to determine the duration and significance of this effect. Anti-cancer treatment perioperatively may be warranted.


Session: Poster

Program Number: P142

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