RT Journal Article T1 Short-Chain Fatty Acid Production by Gut Microbiota Predicts Treatment Response in Multiple Myeloma A1 Rodríguez-García, Alba A1 Arroyo Barea, Andrés A1 García-Vicente, Roberto A1 Morales Fernández, María Luz A1 Gómez-Gordo, Rubén A1 Justo Jiménez, Pablo A1 Cuéllar Pérez-Ávila, Clara A1 Sánchez-Pina, José A1 López-Muñoz, Nieves A1 Alonso Fernández, Rafael Alberto A1 Puig Morón, Noemí A1 Mateos Moreno, María Victoria A1 Ayala Díaz, Rosa María A1 Gómez Garre, María Dulce Nombre A1 Martínez López, Joaquín A1 Linares Gómez, María AB Purpose: The gut microbiota plays important roles in health and disease. We questioned whether the gut microbiota and related metabolites are altered in monoclonal gammopathies and evaluated their potential role in multiple myeloma and its response to treatment.Experimental Design: We used 16S rRNA sequencing to characterize and compare the gut microbiota of patients with monoclonal gammopathy of undetermined significance (n ¼ 11), smoldering multiple myeloma (n ¼ 9), newly diagnosed multiple myeloma (n ¼ 11), relapsed/refractory multiple myeloma (n ¼ 6), or with complete remission (n ¼ 9). Short-chain fatty acids (SCFA) were quantified in serum and tested in cell lines. Relevant metabolites were validated in a second cohort of 62 patients.Results: Significant differences in alpha- and beta diversity were present across the groups and both were lower in patients with relapse/refractory disease and higher in patients with complete remission after treatment. Differences were found in the abundance of several microbiota taxa across disease progression and in response to treatment. Bacteria involved in SCFA production, including Prevotella, Blautia, Weissella, and agathobacter, were more represented in the premalignant or complete remission samples, and patients with higher levels of Agathobacter showed better overall survival. Serum levels of butyrate and propionate decreased across disease progression and butyrate was positivelyassociated with a better response. Both metabolites had antiproliferative effects in multiple myeloma cell lines. Conclusions: We demonstrate that SCFAs metabolites and the gut microbiota associated with their production might have beneficial effects in disease evolution and response to treatment, underscoring its therapeutic potential and value as a predictor. SN 1078-0432 SN 1557-3265 YR 2023 FD 2023-12-18 LK https://hdl.handle.net/20.500.14352/101539 UL https://hdl.handle.net/20.500.14352/101539 LA eng NO Rodríguez-García, Alba, et al. «Short-Chain Fatty Acid Production by Gut Microbiota Predicts Treatment Response in Multiple Myeloma». Clinical Cancer Research, enero de 2024, pp. OF1-14. DOI.org (Crossref), https://doi.org/10.1158/1078-0432.CCR-23-0195. NO Ministerio de Ciencia, Innovación y Universidades (España) NO Instituto de Investigación Hospital 12 de Octubre NO Centro de Investigación Biomédica en Red Cáncer NO Asociación Española Contra el Cáncer NO Sociedad Espanola de Hematología y Hemoterapia DS Docta Complutense RD 18 jul 2024