PT - JOURNAL ARTICLE AU - Navarro, Marta de la Rubia AU - García, Elena Grau AU - Monreal, Ma Jesús Cuellar AU - Álvarez, Iago Alcántara AU - Verdejo, Inmaculada Chalmeta AU - Charia, Hikmat AU - Puig, Luis González AU - Huaylla Quispe, Anderson Víctor AU - Cortés, José Ivorra AU - Leal, Samuel AU - Cordellat, Isabel Martínez AU - Sánchez, Laura Mas AU - Muñoz Martínez, Pablo Francisco AU - Albuixech, Rosa Negueroles AU - Oller Rodríguez, José Eloy AU - Castro, Daniel Ramos AU - Bárcena, Carmen Riesco AU - Novés, Alba Torrat AU - Sugrañes, Ernesto Tovar AU - Bernabeu, Elvira Vicens AU - Mañes, Belén Villanueva AU - Olmos, Inés Cánovas AU - Herranz, Carmen Nájera AU - Román Ivorra, José Andrés TI - P149 Clinical worsening in non-adherent belimumab treatment in SLE AID - 10.1136/lupus-2024-el.203 DP - 2024 Mar 01 TA - Lupus Science & Medicine PG - A155--A156 VI - 11 IP - Suppl 1 4099 - http://lupus.bmj.com/content/11/Suppl_1/A155.2.short 4100 - http://lupus.bmj.com/content/11/Suppl_1/A155.2.full SO - Lupus Sci Med2024 Mar 01; 11 AB - Objective The objective is to analyze the association between therapeutic adherence and disease activity in SLE patients.Methods An observational, prospective study in SLE patients (SLICC/ACR criteria), treated whit subcutaneous Belimumab (200 mg/week) was made. Disease activity was measured by SLEDAI in three consecutive visits, and it was considered clinical worsening an increase of SLEDAI-score of ≥4 point. Persistence and adherence of Belimumab data during the follow-up were collected and were calculated based on the number of drug dispensing. Poor therapeutic adherence was established under the 95%.Results Thirty-one prescriptions of Belimumab were registered (83.9% women) with a mean age of 48.1 (14.9) years. Time since the diagnosis was 12.5 (6.29) years and treatment period were 2.2 (1.4) years. Fifteen patients were considered as non-adherent (48.4%).Persistence and disease activity data in each group were showed in the table 1.View this table:Abstract P149 Table 1 Poor adherence was secondary to clinical improvement (66.67%), recurrent infections (13.33%), surgery (6.67%), pregnancy (6.67%) and inability to drug collect due to COVID-19 pandemic (6.67%). Non-adherent group showed worse SLEDAI-score than adherent group in V0, despite of a similar SLEDAI-score at V2 in both groups was observed. There was an association between poor therapeutic adherence and high delta_SLEDAI (p=0.046).Conclusions We observed an association between poor therapeutic adherence and delta_SLEDAI. The high SLEDAI-score at the beginning of the study in non-adherent group would be due to clinical manifestations, despite of the similar serological activity in both groups.