MicroRNAs as potential predictors of extreme response to tyrosine kinase inhibitors in renal cell cancer.

MicroRNAs play an important role as modulators of gene expression in several biological processes and are closely related to development and cell differentiation regulation. Previous works have revealed a potential predictive role for miRNAs in different tumor types. This study aims to analyze the ability of miRNAs in segregating metastatic renal cell carcinoma patients according to their responses to tyrosine kinase inhibitors (TKIs).

Extreme responders were considered in the study and were defined as those patients that either had a long-term response (LR) (progression-free survival ˃11 months) or those that were primary refractory (PR) (progression as best response). The expression of 754 miRNAs was analyzed in tumor tissue of these 2 sets of patients.

In a study cohort (n = 15) 4 miRNAs were significantly associated with patient response and differentially expressed in PR vs. LR (up-regulated in PR vs. LR: miR-425-5p, down-regulated in PR vs. LR: miR-139-3p, let-7d and let-7e). Further analysis in a validation cohort (n = 36) revealed similar results.

The present data strength the potential role of miRNAs as a tool to predict treatment outcomes in patients with metastatic renal cell carcinoma treated with TKIs.

Urologic oncology. 2020 Feb 18 [Epub ahead of print]

Carmen Garrigós, Sonia Molina-Pinelo, Ricardo Meléndez, Marta Espinosa, Antonio Lerma, Miguel Taron, Jesús García-Donas, Cristina Rodriguez-Antona, Ignacio Duran

Instituto de Biomedicina de Sevilla, IBiS/Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, Sevilla, Spain., Department of Medical Oncology, HM Hospitales - Centro Integral Oncológico HM Clara Campal, Madrid, Spain., Hereditary Endocrine Cancer Group, Human Cancer Genetics Programme, Spanish National Cancer Research Centre (CNIO), Madrid, Spain; ISCIII Center for Biomedical Research on Rare Diseases (CIBERER), Madrid, Spain., Instituto de Biomedicina de Sevilla, IBiS/Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, Sevilla, Spain; Department of Medical Oncology, Hospital Universitario Marqués de Valdecilla, IDIVAL, Santander, Spain. Electronic address: .