RT Journal Article T1 Updated Review and Clinical Recommendations for the Diagnosis and Treatment of Patients with Retroperitoneal Sarcoma by the Spanish Sarcoma Research Group (GEIS) A1 Álvarez Álvarez, Rosa et al. A1 Valverde Morales, Claudia A1 Agra Pujol, Carolina A1 Méndez Fernández, Ramiro Jesús A1 Muñoz Fernández, María De Las Mercedes A1 Asencio Pascual, José Manuel AB Soft tissue sarcomas (STS) are an uncommon and biologically heterogeneous group of tumors arising from mesenchymal cells. The incidence is estimated at five cases per 100,000 people per year. Retroperitoneal sarcomas (RPS) account for 10–15% of all STS, and their management depends on their anatomical characteristics and histotype. Due to their very low incidence, it is recommended that RPS be treated in reference centers and evaluated by an experienced multidisciplinary team (MDT). In Spain, the Spanish Group for Research in Sarcomas (GEIS) brings together experts from various specialties to promote research on sarcomas and improve treatment results. This paper summarizes the GEIS recommendations for the diagnosis, treatment, and follow-up of patients with RPS. PB MPDI YR 2023 FD 2023-06-15 LK https://hdl.handle.net/20.500.14352/103592 UL https://hdl.handle.net/20.500.14352/103592 LA eng NO Álvarez Álvarez, R.; Manzano, A.; Agra Pujol, C.; Artigas Raventós, V.; Correa, R.; Cruz Jurado, J.; Fernandez, J.A.; Garcia del Muro, X.; Gonzalez, J.A.; Hindi, N.; et al. Updated Review and Clinical Recommendations for the Diagnosis and Treatment of Patients with Retroperitoneal Sarcoma by the Spanish Sarcoma Research Group (GEIS). Cancers 2023, 15, 3194. https://doi.org/10.3390/cancers15123194 DS Docta Complutense RD 18 abr 2025