Frem2 Is An Independent Predictor Of Poor Survival In Clear Cell Renal Cell Carcinoma-Evidence From The Cancer Genome Atlas (Tcga)

Fraser syndrome protein 1 (FRAS1) and FRAS1 related extracellular matrix protein 1 and 2 (FREM1, FREM2) are a novel group of basement membrane proteins. The relationship between the three gene (FRAS1, FREM1, FREM2) and renal clear cell carcinoma is completely unclear. Thus, in this research, we used the mRNA sequencing data derived from TCGA kidney renal clear cell carcinoma cohort to assess the association of FRAS1, FREM1 and FREM2 with different clinical features. FRAS1, FREM1 and FREM2 mRNA levels were downregulated in KIRC (kidney renal clear cell carcinoma) tissues than normal tissues (FRAS1, P < 0.0001; FREM1, P < 0.0001, FREM2, P = 0.0001), respectively. FRAS1, FREM1 and FREM2 were significantly different in histologic grade, pathologic stage and pathologic T (all P < 0.001). Low FRAS1, FREM1 and FREM2 expression were correlated to worsen overall survival (all P < 0.01), and Low FREM1 and FREM2 expression had worse relapse-free survival (FREM1, P = 0.0113; FREM2, P = 0.0424). Multivariate Cox regression analysis revealed that FREM2 was an independent prognostic factor for overall survival. Taken together, FREM2 expression is an independent predictor of poor survival in renal clear cell carcinoma and is positively associated with advanced stage, high histologic grade.