The present invention relates to polymeric conjugates of adenine nucleoside analogs. In particular, the invention relates to multi-arm polyethylene glycol conjugates of adenine nucleoside analogs and use thereof. The present invention, more specifically, provides polymeric conjugates of toyocamycin and its derivatives. Furthermore, the present invention provides a method for preparing the polymeric conjugates of adenine nucleoside analogs and a method of using the same for treating a cancer, inhibiting the growth or proliferation of cancer cells, treating a viral infection, treating a disease or condition associated with abnormal expression of VEGF. Most polymeric conjugates of toyocamycin was stable in PBS but released toyocamycin in vivo to provided inhibition of cancer cell growth.
