Dynamics of survival of patients with prostate cancer at the population level, taking into account the stage of the disease and place of residence

Abstract

Background. Prostate cancer (PCa) is rapidly gaining a leading position in the incidence of malignant tumors among men. With a general decrease in mortality from all oncological diseases, mortality from PCa in the Russian Federation is increasing: in 2005 there were 8192 deaths, in 2015 - 11987.Objective of the study. Calculation and assessment of survival rates for patients with PCa in the Samara region for the period from 2010 to 2016, taking into account the stage of the disease, the place of residence of patients, a comparative analysis of the observed, adjusted and relative 5-year survival for this disease in a number of regions of Russia and in the world.Materials and methods. The object of the study was all registered patients for the period 2010-2016, with the first established PCa.The calculation and analysis of the observed (OS), adjusted (AS) and relative (OS) survival of 7670 patients with PCa taking into account the stage of the disease and place of residence (urban residents — 6408people, rural — 1262), registered in the database of the population cancer registry of Samara Region Clinical Oncology Clinic. The start date of the study is January 1, 2010, the end date is December 31, 2019. The calculation of survival was carried out by the dynamic (actuarial) method.Results. When assessing the survival of patients with PCa, lower rates of observed survival were observed than adjusted, which indicates the presence of intercurrent causes of death.During the study period, an inverse dependence of survival on the prevalence of the tumor process was revealed. The level of observed survival and adjusted survival of all patients is associated in the survival range at stages II—III: 1-year-old observed survival — 89.1 % (adjusted survival — 92.3 %), 5-year-old observed survival — 62.6 % (adjusted survival — 76.6 %).The adjusted and relative survival rate for the urban population is higher than for the rural population, which may indicate an insufficient level of access to cancer care for patients with PCa in rural areas: the indicators of 1-year adjusted survival of urban residents are higher — 3.3 % (relative survival — 2.4 %), 5-year-old adjusted survival—7.4 % (relative survival — 10.3 %) than in patients registered in rural hospitals.Conclusion. A comparative analysis of indicators of 1- and 5-year survival of patients with PCa in the Samara region and a number of regions of the Russian Federation for 2006—2010 revealed that domestic indicators of 1-year and 5-year relative survival are slightly lower than the European average for 2000—2007. The range of indicators of the 5-year relative survivalfor 2010—2013 in the Samara region amounted to 82.2—93.1 %.