(57) [Abstract] immunostimulatory molecules, and animal cells at least one of a time and under conditions sufficient to enhance antigen presenting function interferon material comprising the cells cultured in the presence of a (IFN) the composition is disclosed. Preferably said immunostimulating molecule is a T cell costimulatory molecule selected from the group consisting of B7 molecules and ICAM molecules, it is preferable that the animal cells are cancer cells or tumor cells such as melanoma cells and breast cancer cells . Their use for the treatment and / or prevention of an immune enhancing composition and disease or condition are also disclosed.