A multicenter trial of sentinel lymph node mapping in colorectal cancer: prognostic implications for nodal staging and recurrence

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...  

734 Background: 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 H&E. Results: There are 309 pts in SLNM (GpA) vs 499 pts in Conv surgery (GpB); 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 GpA vs GpB, 1+ve LN were found in 38% vs 27%, 2+ve LNs in 10% vs 16%, and > 2 LNs in 53% vs 57%, respectively. Comparing 5 years OS between GpA vs GpB, for 1+ve LN was 62.8% vs 52.38%, for 2 +ve LNs 72.7% vs 48.65% and for > 2 +ve LNs 35% vs 33.33%, respectively. Similarly, DSS for 1 +veLN was 54.4% vs 47.6%, 2+ve LNs 40% vs 40.54% and > 2+ve LNs, 30.4% vs 25.76%, respectively(Table1.). Conclusions: Compared to Conv surgery, SLNM identified higher no. of LNs per pt with high success rate. Five-year OS and DSS also are better in SLNM vs Conv surgery for all +ve LN gps. Hence, SLNM in CCa may have prognostic value. A larger multicenter trial needs to be done to validate such data. [Table: see text]


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