The polyanionic polymer poly(maleic acid-alt-2-cyclohexyl-1,3-dioxepin
-5-ene), poly(MA-CDA), was developed as an immunomodulator. It was fou
nd that the cell affinity of poly(MA-CDA) could be significantly enhan
ced by hydrophobic chemical modification. This paper deals with the bi
ological activities of poly(MA-CDA) and hydrophobically modified poly(
MA-CDA), including immunostimulating activity, antitumour activity and
antiviral activity. (C) 1998 SCI.