A pharmaceutical composition for intraperitoneal delivery of an anti-neoplastic agent is provided for treating cancers associated with aberrant mucin expression, preferably ovarian cancer and pancreatic, prostate, metastatic breast, bladder and lung cancers. The composition comprises nanomicelles loaded with the anti-neoplastic agent, and antibodies such as anti-MUC16, anti-MUC1 or anti-MUC4 are conjugated to these nanomicelles. The antibody-bound nanomicelles are optionally embedded in a biodegradable pH- and thermo-responsive hydrogel capable of sol-gel transition at body temperature. The pharmaceutical composition is implantable in the peritoneum, where it transforms into a semi-solid gel at the bodys core temperature. In response to pH, the hydrogel swells and releases the antibody-bound nanomicelles. The nanomicelles specifically target mucin antigens on cancer cells. The anti-mucin antibodies can be internalized by the tumor cells, enabling the drug-loaded nanomicelles to gain entry and deliver the chemotherapeutic drugs inside the tumor cell.
