Secreted Frizzled Related Protein 1 (SFRP1) promoter methylation status, expression level of SFRP1, beta-catenin, lymphoid-enhancer factor 1 (LEF1), and T-cell factor 1 (TCF1) proteins in astrocytoma samples. Here, CTNNB1 is linked to astrocytoma (excluding glioblastoma).