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CC-220 + rifampin is a combination of iberdomide (CC-220), a small molecule cereblon E3 ligase modulator, and rifampin, a rifamycin class antibiotic. Iberdomide acts by binding and modulating cereblon, the substrate receptor for the CRL4^CRBN^ E3 ubiquitin ligase complex, leading to degradation of transcription factors Ikaros (IKZF1) and Aiolos (IKZF3), producing immunomodulatory and antitumor effects. It is primarily in clinical development for relapsed/refractory multiple myeloma (MM) and systemic lupus erythematosus (SLE)[1][3][5][7]. Rifampin, included in this combination, is not a conventional component of iberdomide therapy; it is a potent inducer of drug-metabolizing enzymes (notably CYP3A4), known to significantly reduce the systemic exposure of many orally administered drugs including immunomodulatory agents.
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