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. This evidence concerns the gene SFRP1 and astrocytoma (excluding glioblastoma).