Comparative analysis of survival in colon cancer undergoing sentinel lymph node mapping versus conventional surgery based on number of positive lymph nodes.

734Background: Unlike in breast cancer or melanoma, resection during sentinel lymph node mapping (SLNM) in colon cancer (CCa) includes regional lymphadenectomy including SLNs and non SLNs. However, SLNM often identifies micrometastases which can be missed by conventional (Conv) surgery and pathologic examination. It is unknown whether this impacts survival or recurrence. Hence, a retrospective analysis was undertaken to study overall (OS) and disease -specific (DSS) survival between patients (pts) undergoing SLNM vs Conv surgery based on the number of +veLNs. Methods: SLNM was done by subserosal injection with blue dye followed by segmental resection including regional lymphadenectomy. All SLNs were ultrastaged and other nodes were examined by conv. methods with HE with average no. of lymph nodes (LNs) and +ve LNs 17.3/1.6 vs 14.4/2.49 respectively. For GpA, success rate was 99.6% and the average no of SLN was 3. Of the pts in Gp...