Used in cancer treatment, particularly for multiple myeloma and mantle cell lymphoma. It functions by inhibiting the proteasome, a cellular complex responsible for protein degradation. This inhibition leads to accumulation of damaged proteins in cancer cells, triggering cell death. The pinanediol formulation improves stability and solubility, enhancing delivery and efficacy. Employed in chemotherapy regimens, especially in patients who have not responded to other treatments. Also investigated for use in solid tumors and autoimmune diseases due to its effect on cell signaling pathways.