RT Journal Article T1 Association of Circular RNA and Long Non-Coding RNA Dysregulation with the Clinical Response to Immune Checkpoint Blockade in Cutaneous Metastatic Melanoma. A1 Oliver, Javier A1 Onieva, Juan Luis A1 Garrido-Barros, Maria A1 Berciano-Guerrero, Miguel-Angel A1 Sanchez-Muñoz, Alfonso A1 Lozano, Maria Jose A1 Farngren, Angela A1 Alvarez, Martina A1 Martinez-Galvez, Beatriz A1 Perez-Ruiz, Elisabeth A1 Alba, Emilio A1 Cobo, Manuel A1 Rueda-Dominguez, Antonio A1 Barragan, Isabel K1 ceRNA K1 circRNA K1 Cutaneous melanoma K1 Immunotherapy K1 lncRNA K1 Metastasis AB Cutaneous melanoma (CM) is the most lethal form of skin cancer if it becomes metastatic, where treatment options and survival chances decrease dramatically. Immunotherapy treatments based on the immunologic checkpoint inhibitors programmed death cell protein 1 (PD-1) and cytotoxic T-lymphocyte antigen 4 (CTLA-4) constituted a main breakthrough in the treatment of metastatic CM, particularly for the achievement of long-term benefits. Even though it is a very promising therapy, resistance to primary immune checkpoint blockade (ICB) arises in about 70% of CM patients treated with a CTLA-4 inhibitor, and 40-65% of CM patients administered with a PD-1-targeting treatment. Some long non-coding RNAs (lncRNAs), and circular RNAs (circRNAs) are implicated in triggering pro- and anti-tumorigenic responses to various cancer treatments. The relationship between lncRNAs, circRNAs and ICB immunotherapy has not been explored in cutaneous metastatic melanoma (CMM). The aim of this pilot study is to evaluate the potential role of circRNA and lncRNA expression variability as pre-treatment predictor of the clinical response to immunotherapy in CMM patients. RNA-seq from 12 formalin-fixed paraffin-embedded (FFPE) samples from the metastatic biopsies of CMM patients treated with nivolumab was used to identify response-associated transcripts. Our findings indicate that specific lncRNAs and circRNAs, probably acting as competitive endogenous RNAs (ceRNAs), are involved in the regulatory networks of the immune response against metastatic melanoma that these patients have under treatment with nivolumab. Moreover, we established a risk score that yields predictions of the overall survival (OS) and progression-free survival (PFS) of CMM patients with high accuracy. This proof-of-principle work provides a possible insight into the function of ceRNAs, contributing to efforts to decipher the complex molecular mechanisms of ICB cancer treatment response. PB MDPI SN 2227-9059 YR 2022 FD 2022-09-27 LK http://hdl.handle.net/10668/20845 UL http://hdl.handle.net/10668/20845 LA en NO Oliver J, Onieva JL, Garrido-Barros M, Berciano-Guerrero MÁ, Sánchez-Muñoz A, José Lozano M, et al. Association of Circular RNA and Long Non-Coding RNA Dysregulation with the Clinical Response to Immune Checkpoint Blockade in Cutaneous Metastatic Melanoma. Biomedicines. 2022 Sep 27;10(10):2419 NO The work is funded by Instituto de Salud Carlos III through the projects PI18/01592 and FI19-00112 (to ALI) (Co-funded by the European Regional Development Fund/European Social Fund “A way to make Europe”/”Investing in your future”), Sistema Andaluz de Salud, through the projects SA 0263/2017, Nicolás Monardes (to I.B.) and PI-0121-2020, Spanish Group of Melanoma (Award for Best Research Project 2020) (to I.B.), Fundación Bancaria Unicaja through the project C19048 (to I.B., M.C.), and Andalusia-Roche Network Mixed Alliance in Precision Medical Oncology (to I.B., E.A.) and Consejería de Salud PI-0121-2020 (to I.B.), RH0090-2020 CSYF 2020 (to J.O.). DS RISalud RD Apr 18, 2025