Moreover, 10 of the differentially expressed protein coding genes (MMP1, MMP9, COL1A2, GREM1, POSTN, FMOD, THSB, DCN, VCAN, CTSK, and IVL) revealed by microarray analysis of tumor cells cultured in spheroids were selected for verification by qRT-PCR. This evidence concerns the gene POSTN and neoplasm.