RT Journal Article T1 Initial clinical and treatment patterns of advanced differentiated thyroid cancer: ERUDIT study. A1 Vallejo Casas, Juan Antonio A1 Sambo, Marcel A1 Lopez Lopez, Carlos A1 Duran-Poveda, Manuel A1 Rodriguez-Villanueva Garcia, Julio A1 Santos, Rita Joana A1 Llanos, Marta A1 Navarro-Gonzalez, Elena A1 Aller, Javier A1 Pubul, Virginia A1 Guadalix, Sonsoles A1 Crespo, Guillermo A1 Gonzalez, Cintia A1 Zafon, Carles A1 Navarro, Miguel A1 Santamaria-Sandi, Javier A1 Segura, Angel A1 Gajate, Pablo A1 Gomez-Balaguer, Marcelino A1 Valdivia, Javier A1 Puig-Domingo, Manel A1 Galofre, Juan Carlos A1 Castelo, Beatriz A1 Villanueva, Maria Jose A1 Argüelles, Iñaki A1 Orcajo-Rincon, Lorenzo K1 Advanced differentiated thyroid cancer K1 Epidemiological study K1 Radioiodine-refractory differentiated thyroid cancer K1 Relapsing differentiated thyroid cancer K1 Relapsing prognostic factors K1 Survival prognostic factors AB Up to 30% of differentiated thyroid cancer (DTC) will develop advanced-stage disease (aDTC) with reduced overall survival (OS). The aim of this study is to characterize initial diagnosis of aDTC, its therapeutic management, and prognosis in Spain and Portugal. A multicentre, longitudinal, retrospective study of adult patients diagnosed with aDTC in the Iberian Peninsula was conducted between January 2007 and December 2012. Analyses of baseline characteristics and results of initial treatments, relapse- or progression-free survival ((RP)FS) from first DTC diagnosis, OS, and prognostic factors impacting the evolution of advanced disease were evaluated. Two hundred and thirteen patients (median age: 63 years; 57% female) were eligible from 23 hospitals. Advanced disease presented at first diagnosis (de novo aDTC) included 54% of patients, while 46% had relapsed from early disease (recurrent/progressive eDTC). At initial stage, most patients received surgery (98%) and/or radioiodine (RAI) (89%), with no differences seen between median OS (95% CI) (10.4 (7.3-15.3) years) and median disease-specific-survival (95% CI) (11.1 (8.7-16.2) years; log-rank test P = 0.4737). Age at diagnosis being Identification of early treatment-dependent prognostic factors for an unfavourable course of advanced disease is possible. An intensified therapeutic attitude may reverse this trend and should be considered in poor-performing patients. Prospective studies are required to confirm these findings. PB BioScientifica SN 2235-0640 YR 2022 FD 2022-06-30 LK http://hdl.handle.net/10668/20449 UL http://hdl.handle.net/10668/20449 LA en NO Vallejo Casas JA, Sambo M, López López C, Durán-Poveda M, Rodríguez-Villanueva García J, Santos RJ, et al. Initial clinical and treatment patterns of advanced differentiated thyroid cancer: ERUDIT study. Eur Thyroid J. 2022 Aug 11;11(5):e210111 DS RISalud RD Apr 10, 2025