TY - JOUR
T1 - Extent of Lymph Node Removal During Esophageal Cancer Surgery and Survival
AU - van der Schaaf, M
AU - Johar, A
AU - Wijnhoven, Bas
AU - Lagergren, P
AU - Lagergren, J
PY - 2015
Y1 - 2015
N2 - Background: It is unclear how the extent of surgical lymph node clearance influences prognosis after surgery for esophageal cancer. Methods: This nationwide, population-based cohort study included 1044 esophageal cancer patients who had undergone esophagectomy between 1987 and 2010 in Sweden, with follow-up until 2012. The independent role of lymph node removal in relation to survival was analyzed using Cox proportional hazards regression, providing hazard ratios (HRs) with 95% confidence intervals (CIs), adjusted for age, sex, comorbidity, tumor (T) stage, neo-adjuvant treatment, surgeon volume, and calendar period. Statistical tests were two-sided, except tests for trend. Results: Analyzed as a linear variable, a higher number of lymph nodes removed did not influence the overall five-year mortality (adjusted HR = 1.00, 95% CI = 0.99 to 1.01). Patients in the third (7-15 nodes) and fourth (16-114 nodes) quartiles of removed nodes did not demonstrate any decreased overall five-year mortality compared with those in the lowest two quartiles (< 7 nodes) (HR = 1.13, 95% CI = 0.95 to 1.35 and HR = 1.17, 95% CI = 0.94 to 1.46, respectively). In early T stages (Tis-T1) the hazard ratios indicated a worse survival with more lymphadenectomy using the median as cutoff (HR = 1.53, 95% CI = 1.13 to 2.06). Increased lymph node removal did not decrease mortality in any specific T stage. A greater number of metastatic nodes and a higher positive-to-negative node ratio were associated with strongly increased mortality. All results were similar when disease-specific mortality was analyzed. Conclusion: This population-based study indicates that more extensive lymph node clearance during surgery for esophageal cancer may not improve survival. These results challenge current clinical guidelines, and further research is needed to change clinical practice.
AB - Background: It is unclear how the extent of surgical lymph node clearance influences prognosis after surgery for esophageal cancer. Methods: This nationwide, population-based cohort study included 1044 esophageal cancer patients who had undergone esophagectomy between 1987 and 2010 in Sweden, with follow-up until 2012. The independent role of lymph node removal in relation to survival was analyzed using Cox proportional hazards regression, providing hazard ratios (HRs) with 95% confidence intervals (CIs), adjusted for age, sex, comorbidity, tumor (T) stage, neo-adjuvant treatment, surgeon volume, and calendar period. Statistical tests were two-sided, except tests for trend. Results: Analyzed as a linear variable, a higher number of lymph nodes removed did not influence the overall five-year mortality (adjusted HR = 1.00, 95% CI = 0.99 to 1.01). Patients in the third (7-15 nodes) and fourth (16-114 nodes) quartiles of removed nodes did not demonstrate any decreased overall five-year mortality compared with those in the lowest two quartiles (< 7 nodes) (HR = 1.13, 95% CI = 0.95 to 1.35 and HR = 1.17, 95% CI = 0.94 to 1.46, respectively). In early T stages (Tis-T1) the hazard ratios indicated a worse survival with more lymphadenectomy using the median as cutoff (HR = 1.53, 95% CI = 1.13 to 2.06). Increased lymph node removal did not decrease mortality in any specific T stage. A greater number of metastatic nodes and a higher positive-to-negative node ratio were associated with strongly increased mortality. All results were similar when disease-specific mortality was analyzed. Conclusion: This population-based study indicates that more extensive lymph node clearance during surgery for esophageal cancer may not improve survival. These results challenge current clinical guidelines, and further research is needed to change clinical practice.
U2 - 10.1093/jnci/djv043
DO - 10.1093/jnci/djv043
M3 - Article
C2 - 25748792
SN - 0027-8874
VL - 107
JO - Journal of the National Cancer Institute
JF - Journal of the National Cancer Institute
IS - 5
ER -