Seminars in hematology
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Much progress has been made in the therapeutic use of immunotoxins since the first clinical trials, especially in the prevention and treatment of AGVHD. This is also further discussed in this symposium by Champlin. ⋯ Other obstacles to the wide use of immunotoxins are the heterogeneity of tumor cells, the shedding of tumor antigens into the circulation, and the inability to identify neoplastic renewal cell specific antigens that are not cross-reactive with normal tissues. Despite these obstacles, the early success of immunotoxins, especially in hematologic malignancies, reinforces the feasibility of designing rational targeting reagents in cancer therapy.