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Rectal Versus Non-rectal Primary Signet Ring Cell Carcinoma of the Colorectum: a Retrospective Survival Analysis Controlled for Confounders

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Abstract

Purpose

Our objective was to compare the outcomes of rectal and non-rectal primary signet ring cell adenocarcinoma of the colorectum.

Methods

A retrospective survival analysis was performed using the Surveillance, Epidemiology, and End Results Program database between 2004 and 2009 on subjects who were diagnosed as having a primary signet ring cell carcinoma of the colorectum. Cox proportional hazard regression analysis controlled for confounders was used to assess overall survival comparing rectal and non-rectal cancers.

Results

Our population was composed of 1,484 patients: 200 affected by rectal cancer and 1,284 by non-rectal cancer. Unadjusted survival curves resulted to be almost superimposable (P = 0.916). After controlling for age, gender, race, tumor stage, grade, and size, tumor location demonstrated a statistically significant impact on overall survival (P = 0.032; 95 % confidence interval 0.640–0.980; hazard ratio 0.792).

Conclusion

On the basis of analysis of information from the SEER database, the signet ring cell carcinoma of the rectum was associated to a worse prognosis as compared to non-rectal cancer.

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Conflict of Interest

The authors declare no conflict of interest.

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Authors and Affiliations

  1. General and Emergency Surgery, Department of Surgery, University of L’Aquila, Ospedale San Salvatore, 67100, L’Aquila, Italy

    Andrea Ciarrocchi

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  1. Andrea Ciarrocchi
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Correspondence to Andrea Ciarrocchi.

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Ciarrocchi, A. Rectal Versus Non-rectal Primary Signet Ring Cell Carcinoma of the Colorectum: a Retrospective Survival Analysis Controlled for Confounders. J Gastrointest Canc 45, 312–318 (2014). https://doi.org/10.1007/s12029-014-9604-0

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