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 byshape memory following deformation by compression through a needle,wherein said cryogel composition comprises a crosslinked gelatin polymer or a crosslinked alginate polymer, andwherein said cryogel composition comprises a cancer antigen.