The present application discloses an injectable device comprising a cell-adhesive cryogel composition comprising open interconnected macropores, wherein said cryogel composition comprises at least 75% pores, wherein said cryogel composition is characterized by shape memory following deformation by compression through a needle, wherein said cryogel composition comprises a crosslinked gelatin polymer or a crosslinked alginate polymer, and wherein said cryogel composition comprises a cancer antigen.本発明は、細胞および薬物送達のためのポリマー組成物を提供する。