Chemical formula: C₂₃H₂₈N₈O₄ Molecular mass: 480.529 g/mol PubChem compound: 24989044
Copanlisib is an inhibitor of phosphatidylinositol-3-kinase (PI3K) with inhibitory activity predominantly against PI3K-α and PI3K-δ isoforms expressed in malignant B cells. Copanlisib has been shown to induce tumor cell death by apoptosis and inhibition of proliferation of primary malignant B cell lines. Copanlisib inhibits several key cell-signaling pathways, including B-cell receptor (BCR) signaling, CXCR12 mediated chemotaxis of malignant B cells, and NFκB signaling in lymphoma cell lines.
At 60 mg (or 0.8 mg/kg) of copanlisib dose, the elevation of plasma glucose was associated with higher copanlisib exposure.
The effect of the recommended copanlisib dose of 60 mg on the QTc interval was evaluated in an open label, dedicated QT study of 25 patients with advanced cancer. No large mean QTc prolongation >20 ms above baseline was observed.
The area under the plasma concentration-time curve (AUC) and maximum plasma concentration (Cmax) of copanlisib increase dose-proportionally over 5 to 93 mg (0.08 to 1.55 times the approved recommended dose) absolute dose range and exhibit linear pharmacokinetics (PK). There is no time-dependency and no accumulation in the PK of copanlisib.
The geometric mean (range) steady state copanlisib exposure at 0.8 mg/kg (approximately the approved recommended dose of 60 mg) are 463 (range: 105 to 1670; SD: 584) ng/mL for Cmax and 1570 (range: 536 to 3410; SD: 338) ng.hr/mL for AUC0-25h.
The in vitro human plasma protein binding of copanlisib is 84.2%. Albumin is the main binding protein. The in vitro mean blood-to-plasma ratio is 1.7 (range: 1.5 to 2.1). The geometric mean volume of distribution is 871 (range: 423 to 2150; SD: 479) L.
The geometric mean terminal elimination half-life of copanlisib is 39.1 (range: 14.6 to 82.4; SD: 15.0) hours. The geometric mean clearance is 17.9 (range: 7.3 to 51.4; SD: 8.5) L/hr.
Approximately >90% of copanlisib metabolism is mediated by CYP3A and <10% by CYP1A1. The M-1 metabolite accounts for 5% of total radioactivity AUC and its pharmacological activity is comparable to the parent compound copanlisib for the tested kinases PI3Kα and PI3Kβ.
Copanlisib is excreted approximately 50% as unchanged compound and 50% as metabolites in humans. Following a single intravenous dose of 12 mg (0.2 times the recommended approved dose) radiolabeled copanlisib, approximately 64% of the administered dose was recovered in feces and 22% in urine within 20 to 34 days. Unchanged copanlisib represented approximately 30% of the administered dose in feces and 15% in urine. Metabolites resulting from CYP450-mediated oxidation metabolism accounted for 41% of the administered dose.
Age (20 to 90 years), gender, race (White, Asian, Hispanic, and Black), smoking status, body weight (41 to 130 kg), and mild, moderate, and severe renal impairment [CLcr ≥15 mL/min as estimated by Cockcroft-Gault (C-G) equation] had no clinically significant effect on the PK of copanlisib. The PK of copanlisib in patients with end stage renal disease (CLcr <15 mL/min by C-G equation) with or without dialysis is unknown.
Based on a population PK analysis in patients with cancer, mild hepatic impairment [total bilirubin ≤1 x ULN and AST > ULN, or total bilirubin <1-1.5 x ULN and any AST] had no clinically relevant effect on the PK of copanlisib.
In a dedicated PK study evaluating a single intravenous dose of 12 mg (0.2 times the recommended approved dose of 60 mg) of copanlisib in subjects with hepatic impairment, the geometric mean of total copanlisib Cmax and AUC increased 1.38-fold and 1.71-fold, respectively, in subjects with moderate hepatic impairment (Child-Pugh B) as compared to normal hepatic function. The geometric mean unbound AUC of copanlisib was increased by 1.23-fold with no effect on Cmax. The PK of copanlisib in patients with severe hepatic impairment (Child-Pugh C or total bilirubin = 3-10 x ULN and any AST) is unknown.
Effect of CYP3A and P-gp Inducers on Copanlisib:
Rifampin, a strong CYP3A and a P-glycoprotein (P-gp) transporter inducer, administered at a dose of 600 mg once daily for 12 days with a single intravenous dose of 60 mg copanlisib in patients with cancer resulted in a 60% decrease in the mean AUC and a 12% decrease in Cmax of copanlisib.
Effect of CYP3A, P-gp and BCRP Inhibitors on Copanlisib:
Itraconazole, a strong CYP3A inhibitor and a P-gp and Breast Cancer Resistance Protein (BCRP) transporter inhibitor, administered at a dose of 200 mg once daily for 10 days increased the mean AUC of a single intravenous dose of 60 mg copanlisib by 53% (or 1.53-fold) with no effect on C max (1.03-fold) in patients with cancer.
Effect of Transporters on Copanlisib:
Copanlisib is a substrate of P-gp and BCRP, but not a substrate for organic cation transporter (OCT) 1, OCT2, and OCT3, organic anion transporter (OAT) 1 and OAT3, organic anion-transporting polypeptide (OATP) 1B1 and OATP1B3, multidrug and toxin extrusion protein 1(MATE1) or MATE2-K.
Effect of Copanlisib on CYP and non-CYP Enzymes:
Copanlisib is not an inhibitor of the metabolism of drugs that are substrates of the major CYP isoforms (CYP1A2, 2A6, 2B6, 2C8, 2C9, 2C19, 2D6, 2E1, and 3A4) or uridine diphosphate-glucuronosyltransferase isoforms (UGT) or dihydropyrimidine dehydrogenase (DPD) at therapeutic 60 mg dose plasma concentrations. Copanlisib is not an inducer of CYP1A2, CYP2B6 and CYP3A.
Effect of Copanlisib on Drug Transporter Substrates:
Copanlisib is not an inhibitor of P-gp, BCRP, multi-drug resistance-associated protein (MRP2), bile salt export pump (BSEP), OATP1B1, OATP1B3, OAT1, OAT3, OCT1, OCT2, and MATE1 at therapeutic 60 mg dose plasma concentrations.
Copanlisib is an inhibitor of MATE2-K (IC50: 0.09 μM). Inhibition may occur after copanlisib infusion at approved recommended dosage. The clinical significance of this potential inhibition on plasma concentrations of concomitantly administered drugs that are MATE2-K substrates is unknown.
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