- The Delta 32 mutation of the chemokine-receptor 5 gene neither is correlated with chronic hepatitis C nor does it predict response to therapy with interferon-alpha and ribavirin. Glas, J., Török, H.P., Simperl, C., König, A., Martin, K., Schmidt, F., Schaefer, M., Schiemann, U., Folwaczny, C. Clin. Immunol. (2003)