Ibrahim, N.K.R. Al Ashakar, M.S. Gad, Z.M. Warda, M.H. Ghanem, H. 2009 A retrospective cohort study was conducted to determine the 5 year survival and prognostic factors for survival for 407 oropharyngeal cancer cases registered in the 3 main hospitals in Alexandria, Egypt, from 1996 2000. Survival analysis was conducted using Kaplan Meier curves, and multivariate Cox regression analysis. The overall 5 year survival rate was 30.8 . Multivariate analysis showed that significant prognostic factors for survival were tumour stage hazard ratio 2.39 95 CI: 1.41 11.72 , tumour site and patient's age. Secondary prevention ...