Analysis of outcomes of the first line systemic therapy in patients with solitary, single and multiple metastases of renal cell carcinoma
Authors: Semenov Dmitry V. , Orlova Rashida V. , Shirokorad Valery I. , Kostritsky Stanislav V. , Korneva Yulia S. 
Published: May 2023

BACKGROUND: Currently there are practically no works in the literature to assess the outcomes of systemic therapy in patients with solitary, single and multiple metastases of renal cell carcinoma.
AIM: The aim of the study was to analyze the outcomes of systemic drug therapy of the first line in patients with solitary, single and multiple metastases of renal cell carcinoma.
MATERIALS AND METHODS: The data of 981 patients with metastatic renal cell carcinoma who underwent systemic therapy of the first line at the City Oncological Hospital No. 62 in Moscow and the City Oncological Dispensary in St. Petersburg from 2006 to 2022 were retrospectively analyzed. All patients underwent clinical, laboratory and pathomorphological examination. 90 (9.2%) patients had solitary metastases, 252 (25.7%) single metastases and 639 (65.1%) multiple metastases. An analysis was made of the outcomes of 1st line therapy, which were conditionally divided into favorable, including all cases of complete response, partial response and stabilization, and unfavorable progression during treatment, death or deregistration. Subsequently patients who had previously received chemotherapy or cytokine treatment were excluded from the analysis.
RESULTS: Complete response (3.3%) and deregistration (5.56%) were more often observed in patients with solitary metastases, stabilization more often occurred in patients with single metastases (51.1%), partial response (9.4%) and death (6.2%) in patients with multiple metastases. In patients with multiple metastases treated with immune checkpoint inhibitors a partial response was observed in almost half of the cases. Stabilization and progression were observed in almost the same percentage of cases (about a quarter of cases), and only two patients had a fatal outcome, which is slightly lower than in patients receiving tyrosine kinase inhibitors. Frequent outcomes when using tyrosine kinase inhibitors were stabilization of the process (40.72% of cases) or progression (38.72%), a complete and partial response was rarely recorded. Significant differences in the occurrence of favorable and unfavorable outcomes were revealed in patients with multiple metastases, depending on the number of affected organs and the prescribed drug. When comparing the results of systemic therapy of the first line, a higher efficiency of tyrosine kinase inhibitors was observed in solitary metastases of tumors with a high and moderate degree of differentiation. Systemic therapy of G3 tumors with solitary metastases had low efficacy in the appointment of tyrosine kinase inhibitors in 27.27% of patients. Higher efficiency was noted in single and multiple metastases. The effectiveness of immune checkpoint inhibitors was revealed in 70.6% of patients with single and multiple metastases.
CONCLUSIONS: When choosing systemic therapy for metastatic renal cell carcinoma in clinical practice, it is necessary to take into account such prognostic factors as histological variants, the degree of differentiation of the tumor and the number of affected organs.