INTRODUCTION: Angiogenesis is central to wound healing and tumor growth. Postoperative (postop) plasma from weeks 2 and 3 after minimally invasive colorectal resection (MICR) stimulates endothelial cell (EC) migration (MIG), invasion (INV), and proliferation (all vital to angiogenesis) compared with preoperative (preop) plasma results and may promote postop tumor growth. The purpose of this study was to determine whether plasma from open colorectal resection (OCR) patients has similar proangiogenic EC effects in vitro. METHODS: OCR cancer patient plasma from institutional review board-approved banks was used; patients with preop and one postop sample from postoperative days (POD) 7-33 were eligible. Samples were bundled into 7- to 13-day periods and considered as single time points. In vitro cultures of human umbilical venous ECs were used for the EC proliferation (BPF, Branch Point Formation), INV, and MIG assays performed with preop, POD 7-13, POD 14-20, and POD 21-33 plasma. Data were analyzed by paired t test and were reported as mean ± standard deviation (significance, P < 0.05). RESULTS: Plasma from 53 cancer patients (25 rectal and 28 colon) was used. Because of limited postop samples, the number for each time point varies: POD 7-13, n = 30; POD 14-20, n = 26; and POD 21-33, n = 17. In vitro EC BPF was significantly greater at the POD 7-13 (P < 0.0001) and POD 14-20 (P < 0.0001) time points versus preop results. Significantly greater EC INV and MIG were noted on POD 7-13 and POD 14-20 versus the preop plasma results (P < 0.0001). In regards to POD 21-33, a significantly greater result was noted only for the INV assay versus preop. CONCLUSIONS: Plasma from weeks 2 and 3 after OCR stimulates in vitro EC BPF, INV, and MIG. A significant difference from preop baseline was noted only for the INV assay in week 4. The OCR and previous MICR results were largely similar. Tumor angiogenesis may be stimulated after OCR and MICR for 3 weeks. Further studies are warranted.
INTRODUCTION: Angiogenesis is central to wound healing and tumor growth. Postoperative (postop) plasma from weeks 2 and 3 after minimally invasive colorectal resection (MICR) stimulates endothelial cell (EC) migration (MIG), invasion (INV), and proliferation (all vital to angiogenesis) compared with preoperative (preop) plasma results and may promote postop tumor growth. The purpose of this study was to determine whether plasma from open colorectal resection (OCR) patients has similar proangiogenic EC effects in vitro. METHODS: OCR cancerpatient plasma from institutional review board-approved banks was used; patients with preop and one postop sample from postoperative days (POD) 7-33 were eligible. Samples were bundled into 7- to 13-day periods and considered as single time points. In vitro cultures of human umbilical venous ECs were used for the EC proliferation (BPF, Branch Point Formation), INV, and MIG assays performed with preop, POD 7-13, POD 14-20, and POD 21-33 plasma. Data were analyzed by paired t test and were reported as mean ± standard deviation (significance, P < 0.05). RESULTS: Plasma from 53 cancerpatients (25 rectal and 28 colon) was used. Because of limited postop samples, the number for each time point varies: POD 7-13, n = 30; POD 14-20, n = 26; and POD 21-33, n = 17. In vitro EC BPF was significantly greater at the POD 7-13 (P < 0.0001) and POD 14-20 (P < 0.0001) time points versus preop results. Significantly greater EC INV and MIG were noted on POD 7-13 and POD 14-20 versus the preop plasma results (P < 0.0001). In regards to POD 21-33, a significantly greater result was noted only for the INV assay versus preop. CONCLUSIONS: Plasma from weeks 2 and 3 after OCR stimulates in vitro EC BPF, INV, and MIG. A significant difference from preop baseline was noted only for the INV assay in week 4. The OCR and previous MICR results were largely similar. Tumor angiogenesis may be stimulated after OCR and MICR for 3 weeks. Further studies are warranted.
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