The state of oncological care in Russia: malignant skin neoplasms (C44). Part 1. Prevalence, quality of accounting, age characteristics, localization, and histological structure (clinical-population study)

This work represents a clinical-population study of the state of oncological care in Russia, focused on malignant skin neoplasms (C44). The study analyzes data on the prevalence of this disease, the quality of case accounting, age characteristics, and the localization and histological structure of tumors. The aim of this research is to continue the investigation into the patterns of prevalence of skin neoplasms (C44), assess the quality of primary accounting, and evaluate the impact of the coronavirus infection epidemic on analytical indicators of prevalence and patient survival. The conducted study confirmed the trend of increasing morbidity and decreasing mortality from skin neoplasms (C44) among the population of Russia and the Northwestern Federal District of the Russian Federation. A clear positive dynamics in the quality of accounting is observed. Special attention is given to the specifics of morbidity changes in neoplasms (C44) considering each age group of the population of Russia. At the population level, the age-specific mortality of patients is presented for each year of observation, analyzed in the context of five-year cohort groups. For the first time, a trend has been identified showing an increase in annual mortality from skin neoplasms (C44) after the sixth year of observation following the treatment of patients.