Prognostic factor for patients with gastric cancer using the Aalen’s additive hazards model

Saman Maroufizadeh; Ebrahim HajiZadeh; Ahmad Reza Baghestani; Seyed Reza Fatemi

Koomesh

Journal of Semnan University of Medical Sciences

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Prognostic factor for patients with gastric cancer using the Aalen’s additive hazards model

Author(s):

Saman Maroufizadeh,

Ebrahim HajiZadeh

^,*,

Ahmad Reza Baghestani

,

Seyed Reza Fatemi

Koomesh:Vol. 13, issue 1; 120-126

Published online:May 25, 2011

Article type:Research Article

Received:Jan 18, 2011

Accepted:Jul 14, 2011

How to Cite:Saman MaroufizadehEbrahim HajiZadehAhmad Reza BaghestaniSeyed Reza FatemiPrognostic factor for patients with gastric cancer using the Aalen’s additive hazards model.koomesh.13(1):e152498.

Abstract

Introduction: Gastric cancer is the second leading cause of cancer death worldwide and is the most common type of cancer in Iran. The objectives of this study were to assess the effects of prognostic factors on survival of patients with gastric cancer using the Aalen additive hazards model, and to illustrate the advantage of Aalen’s plot. Materials and Methods: Information of total of 213 patients with gastric cancer who underwent surgery in the gastroenterology ward of Taleghani hospital in Tehran between 2003 and 2008 were included in this historical cohort study. Age at diagnosis, sex, presence of metastasis, tumor size, histology type, lymph node metastasis, and pathologic stages were entered into analysis using the Aalen additive hazard model. To visualize a covariate effect over time, the estimated cumulative regression function by the Aalen’s model is examined. Results: The univariate and multivariate analysis identified that age at diagnosis, tumor size and pathologic stage were independent prognostic factors for the survival of patients with gastric cancer (p0.05). Conclusions: In spite of using Cox model in survival analysis by many researchers, Aalen’s model may yield new insights in prognostic studies of survival time of patients with gastric cancer over time. Our results suggest that early detection of patients in younger age and in primary stages is important to increase survival from gastric cancer.

Keywords

Gastric cancer, Aalen’s additive hazards model, Prognostic factor, Survival

سرطان معده، مدل مخاطرات جمعی آلن، عوامل پیش‌آگهی کننده، بقاء

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