Research Paper Volume 10, Issue 12 pp 4107—4119

Comparisons of metastatic patterns of colorectal cancer among patients by age group: a population-based study

Lin Yang 1, *, , Xingli Yang 2, *, , Wenzhuo He 1, *, , Shousheng Liu 1, , Chang Jiang 1, , Kunqian Xie 1, , Kunwei Peng 1, , Yafei You 1, , Bei Zhang 1, , Liangping Xia 1, ,

  • 1 Department of Medical Oncology, Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center of Cancer Medicine, Guangzhou, China
  • 2 Department of Radiotherapy, Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center of Cancer Medicine, Guangzhou, China
* Equal contribution

received: November 2, 2018 ; accepted: December 3, 2018 ; published: December 28, 2018 ;

https://doi.org/10.18632/aging.101700
How to Cite

Copyright: Yang et al. This is an open‐access article distributed under the terms of the Creative Commons Attribution License (CC BY 3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Population-based evaluations of the incidence of metastatic colorectal cancer at diagnosis among different age groups are lacking. Therefore, we investigated the effects of age at diagnosis on metastatic colorectal cancer and patients’ prognoses. The Surveillance, Epidemiology, and End Results database was used to identify patients diagnosed with metastatic colorectal cancer. Multivariate Cox regression analyses were performed to identify factors associated with poor survival. The Kaplan–Meier analysis was used to estimate survival differences between the subgroups. We identified 30,333 adult patients diagnosed with metastatic colorectal cancer between 2010 and 2014. The younger and middle-aged groups had better survival than the older group when brain metastasis was not involved. The liver was the most common site of metastasis followed by the liver and lung combined. Age at diagnosis was an independent factor in patients’ survival. Survival differences between two and three-sites of metastases were found in the middle-aged and older groups but not in the younger group. No survival differences between three and four sites of metastases were found in any of the age groups. Therefore, the incidence and prognosis of metastatic sites for metastatic colorectal cancer varied by age group.

Abbreviations

CRC: Colorectal cancer; mCRC: metastasis colorectal cancer; SEER: Surveillance, Epidemiology, and End Results; RCC: Right-sided location cancer; LCC: Left-sided colon cancer; RSC: rectosigmoid cancer; MC: mucinous adenocarcinoma; AC: adenocarcinoma; OS: Overall Survival; MST: Median Survival Time.