Life expectancy in patients with metastatic renal cell carcinoma in the Russian Federation: results of the RENSUR3 multicenter registry study

Background. Overall survival (OS) data obtained in patients with metastatic renal cell carcinoma (mRCC) in real-world settings are rarely published. The objective of the RENSUR3 registry study was to collect information on the use of various therapeutic options for mRCC in real-world clinical practice and assess OS in a Russian population. Methods . Patients were retrospectively identified at 8 cancer centres in different Russian regions and enrolled in the study if the diagnosis of mRCC had been made in the period from January 2015 to December 2016. Anonymous data were collected online, the registry contained demographic characteristics and treatment and outcome data. Results. The study had 573 subjects included in the analysis. The average age of patients at mRCC diagnosis was 63.1 years; 14.5 % of them were aged > 75 years. 65.6 % of the subjects were men; 72% had received surgical treatment for the primary tumour; clear cell and non-clear cell carcinomas were detected in 84 % and 16 % of the patients, respectively. Drug therapy was used in 307 patients (54%). The median duration of any line of therapy was 10 months (95% CI 7.6-12.4). The most frequent treatment option was interferon (administered 161 times as part of any line of therapy or at different stages of treatment). Targeted therapy was given to 160 patients (52.1%), 112 of whom received it as first-line therapy. 87 subjects (28.3%) received > 2 lines of therapy. The 3-year OS rate was 21%, and the median OS was 12 months (95% CI 11.1-12.9). The median OS in the therapy and no therapy groups was 15.1 months and 6.9 months, respectively ( Р <0.0001). The median life expectancy in patients receiving second-line therapy (median 18.4 months) was significantly higher than in patients treated with first-line therapy only (10.9 months, Р <0.001). Conclusions: The OS results of the RENSUR3 study are unsatisfactory, which apparently can be explained by the fact that drug therapy was used in only half the patients, the infrequent use of targeted drugs, and the rare administration of targeted therapy for second and subsequent lines of therapy in patients with progressive disease. Introduction of the latest drug therapy options, including checkpoint inhibitors, will help improve patients» life expectancy.