S. Komukai et al., Significance of immunohistochemically demonstrated micrometastases to lymph nodes in esophageal cancer with histologically negative nodes, SURGERY, 127(1), 2000, pp. 40-46
Background. We examined the prevalence, patterns, and clinical significance
of nodal micrometastases in patients with esophageal cancer.
Methods. Cervical, mediastinal, and abdominal lymph nodes systematically re
moved from 37 patients without conventional histologic evidence of lymph no
de metastasis from esophageal squamous cell carcinoma were immunohistochemi
cally examined to detect cells that were stained for cytokeratins by the mo
noclonal antibody cocktail AE1/AE3 Postoperative care and survival were com
pared in cases with and without such micrometastases.
Results. Nodal micrometastases were found in 14 of 37 patients (38%). Among
these patients, 9, 7, and 4 had micromdastases to abdominal, mediastinal,
and cervical lymph nodes, respectively. Postoperative tumor recurrence was
significantly more frequent in patients with micrometastases (50%) than in
those without (9%, P =.008). Overall and relapse-free survival in the forme
r group was significantly worse than in the latter group (P =.042 and P =.
002, respectively). Nodal micrometastases had an independent prognostic imp
ortance for relapse-free survival as determined by multivariate analysis.
Conclusions. Metastatic tumor cells are frequently present in lymph nodes,
even in patients without histologic evidence of nodal metastasis from esoph
ageal cancer. Nodal micrometastases indicates a poorer prognosis after a cu
rative esophagectomy procedure in histologically node-negative cases.