Compared to the primary tumor, BCTCs exhibited increased expression of CSF3, WNT5B, BAMBI, MGMT, MLF1, GADD45A, HSPB1, PLAT, DUSP, and TSPAN7 and decreased expression of COL1A1, PDGFRB, COL3A1, COL5A1, IGF1, COL5A2, CARD11, GAS1, SFRP2, and COL1A2. This evidence concerns the gene SFRP2 and neoplasm.