The present invention relates to the use of a protein that is differentially expressed in primary brain tumor tissues, as compared to normal brain tissues, as a biomolecular target for tumor treatment therapies. The protein is also expressed in tissues from adenocarcinoma, non-melanoma, and renal carcinoma cells. Immunotherapeutic and immunoimaging agents that specifically bind to an identified brain tumor target protein are provided. The present invention also provides compounds and pharmaceutically acceptable compositions for administration in the methods of the invention.