Prognostic significance and role in TNM stage of tumor deposits in esophageal cancer

Background: Tumor deposits (TDs) are now observed in esophageal cancer (EC), but the role of TDs is seldom elucidated. This study aimed to research the prognostic significance and the role of TDs in EC. The patients with primary EC, who had undergone curative esophagectomy in West China Hospital from May 2005 to May 2011 were retrospectively enrolled. Methods: The prognosis and clinicopathological traits were compared between tumor deposits positive (TDP) and tumor deposits negative (TDN) groups in all patients and TNM 0-IV stages respectively. Results: In our study, 1,044 patients were enrolled, with 948 (90.8%) in TDN group and 96 (9.2%) in TDP group. TDP group had significantly more advanced EC and worse prognosis (all P<0.001) than TDN group in all patients, TNM II stage and TNM III stage. The prognosis of TDP group in TNM II stage was significantly worse than TDN patients in TNM III stage (P<0.001), and the worst prognosis was always found in patients with at least one TD regardless of the number of metastatic lymph node is. Conclusions: Patients in TDP subgroup had more advanced EC and worse prognosis than those in TDN subgroup. It might be more reasonable to be regarded as an indicator of stage migration in EC.