10022-MET-2 CLINICAL FEATURES OF RENAL CELL CARCINOMA BRAIN METASTASES COMPARED WITH OTHER CARCINOMAS

Abstract INTRODUCTION In recent years, the positioning of surgical treatment for metastatic brain tumors has changed. To extract conditions suitable for surgical treatment, the background factors for each primary lesion were verified by retrospective analysis of our case. SUBJECTS AND METHODS From 2014 to 2022, 425 patients with metastatic brain tumors diagnosed and treated at our university were included. There were 219 lung cancers, 46 breast cancers, 64 gastrointestinal cancers, 26 renal cell carcinomas, and 70 others. First, the tumor volume and edema volume were measured, and the ROC curve was drawn for the presence or absence of symptoms to determine the cutoff value. After that, statistical analysis was performed on the following items for each primary lesion. The items were tumor volume (T), edema volume (E), tumor edema ratio (E/T), age, KPS, hemorrhage, cyst formation, meningitis, metastasis to other organs, posterior fossa, simultaneous detection, and single tumor. RESULTS The symptomatic cutoff was 1514mm3 for tumor volume (sensitivity 0.86 specificity 0.74) and 15616 mm3 for edema volume (sensitivity 0.85 specificity 0.85). The tumor edema ratio was significantly higher in renal cell carcinoma. Factors with significant differences were older age and multiple lesions in lung cancer, younger age and posterior fossa in breast cancer, lower KPS in gastrointestinal cancer, and solitary cases and bleeding in renal cell carcinoma. DISCUSSION/CONCLUSION In this analysis, many cases of brain metastasis from renal cell carcinoma are solitary, and because they exhibit extensive edema that seems to be affected by VEGF, they tend to develop symptoms while they are small, and they are characterized by hemorrhage easily during the course. These findings suggest that patients with brain metastases from renal cell carcinoma should be given priority for surgical treatment.