Radiofrequency Ablation Multicenter Observational Study in Renal Oncology Patients

Patient selection criteria will be those typically established by each participating center t with T1a primary renal tumors for which a Multidisciplinary Tumor Board has indicated as candidates for treatment with radiofrequency ablation.I Inclusion Criteria: * Age ≥18 years * Signed informed consent approved by the Ethics Committee prior to the ablation procedure. * RCC in stage T1a (size \<4 cm), single or multiple, histologically demonstrated by percutaneous biopsy before or within 30 days prior to ablation * Absence of comorbidities that contraindicate treatment * Eastern Cooperative Oncology Group Performance Status (ECOG PS) 0-2 at baseline screening. Exclusion Criteria: * No specific exclusion criteria are established for this clinical registry due to its observational nature. Each center will apply its own criteria according to its routine clinical practice.