B-cell receptor idiotype (Id) (Id)

The B-cell receptor idiotype (Id) is a unique, tumor-specific antigen found on the surface of malignant B cells in clonal lymphoproliferative disorders. Because each B-cell lymphoma originates from a single progenitor cell, all progeny express an identical immunoglobulin molecule with unique variable regions that serve as a distinct molecular signature (Levy, R. et al., 1982, N Engl J Med). This idiotype is an ideal therapeutic target because it is entirely absent from normal B cells and other healthy tissues, providing a high degree of tumor specificity (Kwak, L. W., 2010, Blood). Therapeutic approaches have primarily focused on personalized idiotype vaccines, such as Dasiprotimut-T, which are custom-manufactured for each patient by isolating the tumor-specific protein and conjugating it to an immunogenic carrier like Keyhole Limpet Hemocyanin (KLH) (Schuster, S. J. et al., 2011, J Clin Oncol). These vaccines aim to induce both humoral and cellular immune responses against the tumor (Bendandi, M. et al., 1999, Nat Med). Despite the promise of high specificity and low toxicity, the clinical application of idiotype-targeted therapies is challenged by the logistical complexity of personalized manufacturing and the potential for the tumor to escape immune pressure through somatic hypermutation of the immunoglobulin genes (Inoges, S. et al., 2006, J Natl Cancer Inst).

Other names

Tumor-specific idiotypeImmunoglobulin idiotypeClonal B-cell receptorId antigenB-cell receptor variable region

Induction of a patient-specific immune response against the unique variable regions of the clonal B-cell receptor through active vaccination or passive administration of anti-idiotype antibodies.