Several phosphatidylinositol-3-kinase (PI3K) inhibitors are being investigated as a treatment for patients with B-cell malignancies. Such agents prevent activation of PI3K enzymes that are hyperactive in many B-cell malignancies and associated with tumor progression. Copanlisib is a novel pan-Class I phosphatidylinositol-3-kinase (PI3K) inhibitor with potent preclinical inhibitory activity against both PI3K-d and PI3K-α isoforms.

    In vitro: BAY 80-6946 is a phosphoinositide 3-kinase (PI3K) inhibitor with potential antineoplastic activity, which inhibits proliferation with IC50 of 147 nM in HuCCT-1 (KRASG12D ) and 137 nM in EGI-1 (KRASG12D ) cell lines.

    In vivo: BAY 80-6946 is generally well tolerated through the maximum tolerated dose (MTD) of 0.8 mg/kg. pharmacokinetics (PK) results support dosing weekly. Grade 2 or 3 hyperglycemia in the first 24 hrs after receiving a MTD dose. Pharmacokinetics, clinical SD as well as FDG-PET data are consistent with effective exposure and PI3K pathway inhibition.

    Clinical trial: Copanlisib (BAY 80-6946), developed by Bayer, is a selective Class I phosphoinositide 3-kinase inhibitor which has shown promise in Phase I/II clinical trials for the treatment of non-Hodgkin lymphoma and chronic lymphocytic leukemia. Phase II study shows that Copanlisib is active as a single-agent in heavily pretreated, advanced refractory/relapsed FL, MZL, , CLL and SLL. Copanlisib exhibited an acceptable toxicity profile, which was consistent with previous findings.


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