Assessment of prognostic factors in long-term survival of male and female patients with colorectal cancer using non-mixture cure model based on the Weibull distribution

Azizmohammad Looha, Mehdi and Zarean, Elaheh and Masaebi, Fatemeh and Pourhoseingholi, Mohamad Amin and Zali, Mohamad Reza (2021) Assessment of prognostic factors in long-term survival of male and female patients with colorectal cancer using non-mixture cure model based on the Weibull distribution. Surgical Oncology, 38. ISSN 09607404

Full text not available from this repository.
Official URL:


Objective: Colorectal cancer (CRC) is known as one of the malignant form of cells growing in the inner lining of colon and rectum which could seriously affect the cure rate of patients. We aimed to evaluate the effect of prognostic factors on cure fraction of CRC patients. Methods: A total of 1043 CRC patients were included to the study from December 2001 to January 2007 at the Research Center of Gastroenterology and Liver Disease in Shahid Beheshti University of Medical Sciences, Tehran, Iran. Patients� information was extracted from their medical records, then they were followed to identify their death status via phone-call. Weibull non-mixture cure model was used to evaluate the effect of the risk factors on cure fraction of CRC patients. Results: The five-years survival rate was 0.66 (males: 0.64 and female: 0.69). The median survival time for non-cured CRC patients were 3.45 years (males: 3.46; females = 3.45 years). In the single Weibull model, BMI�30 (OR = 4.61, p-value = 0.033), poorly differentiated tumor grade (OR = 0.36, p-value = 0.036), tumor size�25 mm (OR = 0.22, p-value = 0.046), and N1-stage (OR = 0.42, p-value = 0.005) had significant effect on females� cure fraction. Also, cure fraction of male CRC patients significantly affected by BMI (levels:25.0�29.9-OR = 12.13-p-value<0.001; �30-OR = 7.00-p-value = 0.017), T1-stage (OR = 0.52, p-value = 0.021), M1-stage (OR = 0.45, p-value = 0.007), IV-staging (OR = 0.36, p-value = 0.041) and IBD (OR = 0.26, p-value = 0.017). In multiple Weibull model, females were associated with tumor size�25 mm (OR = 0.20, p-value = 0.044) and N1-stage (OR = 0.45, p-value = 0.013) and males were affected by M1-stage (OR = 0.41, p-value = 0.011) and IBD (OR = 0.20, p-value = 0.022).The cure fraction of males and females CRC patients was 64 and 69, respectively. Conclusions: The prognostic factors for cure fraction of patients with CRC may be different among males and females. Further multicenter studies are required to assess the effect of common prognostic factors between males and females.

Item Type: Article
Additional Information: cited By 0
Uncontrolled Keywords: antineoplastic agent, aged; Article; body mass; cancer grading; cancer immunotherapy; cancer mortality; cancer patient; cancer prognosis; cancer staging; cancer surgery; cancer survival; cancer survivor; chemoradiotherapy; clinical evaluation; cohort analysis; colorectal cancer; controlled study; female; follow up; human; Iran; long term survival; major clinical study; male; mean survival time; median survival time; medical record review; overall survival; priority journal; retrospective study; risk factor; sex difference; statistical distribution; survival analysis; survival factor; survival rate; tumor volume; university hospital; weibull distribution
Subjects: WI Digestive System
Divisions: Reserach Vice-Chancellar Department > Modeling in Health Research Center
Depositing User: zeynab . bagheri
Date Deposited: 09 May 2021 04:20
Last Modified: 09 May 2021 04:20

Actions (login required)

View Item View Item