Clinical impact of lymphadenectomy extent in resectable gastric cancer of advanced stage |
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Authors: | Roderich E Schwarz David D Smith |
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Institution: | (1) Division of Surgical Oncology (RES), The Cancer Institute of New Jersey, New Brunswick, NJ 08903, USA;(2) Division of Biostatistics (DDS), City of Hope Cancer Center, Duarte, CA 91010, USA;(3) Department of Surgery, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, The Cancer Institute of New Jersey, 195 Little Albany Street, New Brunswick, NJ 08901, USA |
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Abstract: | Background Advanced, but potentially still curable gastric cancer (stages IIIA, IIIB, or stage IV M0) is associated with very high recurrence
rates after gastrectomy. The value of an extended lymph node dissection (ELND) remains unclear in this setting.
Methods A resected gastric cancer data set was created through structured queries to the SEER 1973–2000 database. Relationships between
the number of lymph nodes (LNs) examined and survival outcomes were analyzed for the stage subgroups characterized by the
N categories N2 or N3, and transmural tumor extension (T categories T2b or T3).
Results The study group encompassed 1,377 patients, including T2b/3N2 (n = 1,076) and T2b/3N3 stage subgroups (n = 301). Total LN count (or number of negative LNs examined; P < 0.0001), number of positive LNs (P < 0.0001), age (P < 0.0001), primary site (P = 0.0002), T category (P = 0.0271), race (P = 0.0301) and gender (P = 0.0261) were independent prognostic survival predictors. A cut point analysis yielded the ability to detect significant
survival differences for LN numbers up to 30 (N2) or up to 40 (N3), always in favor of the higher number of LNs examined.
Best long-term survival outcomes were observed with negative LN counts of more than 15 (N2) or more than 20 (N3).
Conclusions Even in transmural or serosa-positive gastric cancer with advanced nodal involvement, more extensive LN dissection and analysis
influences survival. Stage-based survival prediction depends on total LN number and number of negative LNs. The mechanism
remains uncertain, but is not limited to stage migration. ELND during potentially curative gastrectomy is recommended even
for advanced gastric cancer. |
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