BMP1 and cancer: We found that, compared to the control tumors, lenti-BMP1 tumors have more ColI deposition both by cancer cells and, to a lesser extent, stromal cells, however, lenti-BMP1/shCOL1A1 tumors have reduced ColI deposition from cancer cells, but somewhat increased stromal ColI deposition both by IHC staining (Fig. 5j, k) and by WB on enriched ECM (Supplementary Fig. 5B, C).