- Significance of HDMX-S (or MDM4) mRNA splice variant overexpression and HDMX gene amplification on primary soft tissue sarcoma prognosis. Bartel, F., Schulz, J., Böhnke, A., Blümke, K., Kappler, M., Bache, M., Schmidt, H., Würl, P., Taubert, H., Hauptmann, S. Int. J. Cancer (2005)