Although some of the previous studies showed a trend towards a higher frequency of OLNMs in patients with higher pT stage or poorer differentiated diseases 14 , 21 , the majority of studies did not demonstrate any correlation between histologic grade or pT stage and the prevalence of OLNM 10 , 17 , 18 , 22 .
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Prognostic value of occult lymph node metastases in patients with completely resected esophageal squamous cell carcinoma.
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