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Chinese Journal of Colorectal Diseases(Electronic Edition) ›› 2020, Vol. 09 ›› Issue (06): 563-569. doi: 10.3877/cma.j.issn.2095-3224.2020.06.005

Special Issue:

• Original Article • Previous Articles     Next Articles

A model for predicting the prognosis of elderly patients with rectal mucinous adenocarcinoma

Hengchang Liu1, Chunxiang Li2, Ran Wei1, Zheng Liu1, Haipeng Chen1, Xu Guan1, Zhixun Zhao1, Shuangmei Zou3, Xishan Wang1,(), Zheng Jiang1,()   

  1. 1. Department of Colorectal Surgery, National Cancer Center/National Clinical Research Center for Cancer / Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
    2. Department of Thoracic Surgery, National Cancer Center/National Clinical Research Center for Cancer / Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
    3. Department of Pathology, National Cancer Center/National Clinical Research Center for Cancer / Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
  • Received:2020-07-02 Online:2020-12-25 Published:2020-12-25
  • Contact: Xishan Wang, Zheng Jiang
  • About author:
    Corresponding authors: Jiang Zheng, Email:
    Wang Xishan, Email:

Abstract:

Objective

We wanted to explore the independent risk factors for the prognosis of elderly patients with rectal mucinous adenocarcinoma (RMAC), and to construct a nomogram that can predict the overall survival (OS) and cancer specific survival (CSS).

Methods

The clinicopathological data of 1 657 patients with RMAC aged 60 and over who were diagnosed and registered in 2010~2016 were collected from the Surveillance, Epidemiology and End Re sults database (SEER) of the National Cancer Research Institute of the United States. These patients were randomly divided into training queue and verification queue according to the proportion of 7:3 by R software. Univariate and multivariate Cox regression analysis were used to analyze the independent risk factors affecting the prognosis, and then nomograms were constructed to predict the OS and CSS. C-index was used to evaluate the prediction efficiency of these nomograms. The prediction accuracy was checked in training queue and verification queue by using correction curve.

Results

Sex, age, marital status, histological grade, TNM stage, radiotherapy, adjuvant chemotherapy, number of positive lymph nodes and tumor size were independent prognostic factors for OS in elderly RMAC patients. Marriage status, race, histological grade, TNM stage, adjuvant chemotherapy, positive lymph nodes and tumor size are independent prognostic factors of CSS in elderly RMAC patients. The C-index of the nomogram were 0.735 for OS and 0.780 for CSS. Neoadjuvant radiotherapy combined with adjuvant chemotherapy can improve OS (χ2=7.682, P=0.006) and CSS (χ2=6.476, P=0.011).

Conclusions

We've found some independent risk factors affecting the prognosis of elderly RMAC patients, and a nomogram model was constructed to evaluate the prognosis. It was found that neoadjuvant radiotherapy combined with postoperative adjuvant chemotherapy may improve the prognosis of these patients.

Key words: Rectal neoplasms, Mucinous adenocarcinoma, SEER database, Nomogram, Prognosis

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