RT Journal Article T1 Malignancies in Deceased Organ Donors: The Spanish Experience. A1 Mahíllo, Beatriz A1 Martín, Silvia A1 Molano, Esteban A1 Navarro, Aurora A1 Castro, Pablo A1 Pont, Teresa A1 Andrés, Amado A1 Galán, Juan A1 López, Montserrat A1 Oliver, Eva A1 Martínez, Adolfo A1 Mosteiro, Fernando A1 Roque, Rebeca A1 Pérez-Redondo, Marina A1 Cid-Cumplido, Manuela A1 Ballesteros, María A A1 Daga, Domingo A1 Quindós, Brígida A1 Sancho, Micaela A1 Royo-Villanova, Mario A1 Bernabé, Esther A1 Muñoz, Raúl A1 Chacón, José Ignacio A1 Coll, Elisabeth A1 Domínguez-Gil, Beatriz AB To better define the risk of malignancy transmission through organ transplantation, we review the Spanish experience on donor malignancies. We analyzed the outcomes of recipients of organs obtained from deceased donors diagnosed with a malignancy during 2013-2018. The risk of malignancy transmission was classified as proposed by the Council of Europe. Of 10 076 utilized deceased donors, 349 (3.5%) were diagnosed with a malignancy. Of those, 275 had a past (n = 168) or current (n = 107) history of malignancy known before the transplantation of organs into 651 recipients. Ten malignancies met high-risk criteria. No donor-transmitted cancer (DTC) was reported after a median follow-up of 24 (interquartile range [IQR]: 19-25) mo. The other 74 donors were diagnosed with a malignancy after transplantation. Within this group, 64 donors (22 with malignancies of high or unacceptable risk) whose organs were transplanted into 126 recipients did not result in a DTC after a median follow-up of 26 (IQR: 22-37) mo, though a prophylactic transplantectomy was performed in 5 patients. The remaining 10 donors transmitted an occult malignancy to 16 of 25 recipients, consisting of lung cancer (n = 9), duodenal adenocarcinoma (n = 2), renal cell carcinoma (n = 2), extrahepatic cholangiocarcinoma (n = 1), prostate cancer (n = 1), and undifferentiated cancer (n = 1). After a median follow-up of 14 (IQR: 11-24) mo following diagnosis, the evolution was fatal in 9 recipients. In total, of 802 recipients at risk, 16 (2%) developed a DTC, which corresponds to 6 cases per 10 000 organ transplants. Current standards may overestimate the risk of malignancy transmission. DTC is an infrequent but difficult to eliminate complication. YR 2022 FD 2022-04-01 LK http://hdl.handle.net/10668/19871 UL http://hdl.handle.net/10668/19871 LA en DS RISalud RD Feb 18, 2025