Limitation of Use: DAURISMO has not been studied in patients with the comorbidities of severe renal impairment or moderate-to-severe hepatic impairment.
Females of Reproductive Potential
DAURISMO is not recommended for use during pregnancy. Conduct pregnancy testing in female patients of reproductive potential prior to initiating DAURISMO treatment. Advise females of reproductive potential to use effective contraception during treatment with DAURISMO and for at least 30 days after the last dose. Advise women not to breastfeed during treatment with DAURISMO and for at least 30 days after the last dose [see Use in Specific Populations (8.2, 8.3)].
Males
Advise male patients with female partners of the potential risk of exposure through semen and to use effective contraception, including a condom, even after vasectomy, to avoid drug exposure to a pregnant partner or a female partner of reproductive potential during treatment with DAURISMO and for at least 30 days after the last dose [see Use in Specific Populations (8.3)].
Blood Donation
Advise patients not to donate blood or blood products while taking DAURISMO and for at least 30 days after the last dose of DAURISMO because their blood or blood products might be given to a female of reproductive potential.
Risk Summary
Based on its mechanism of action and findings in animal embryo-fetal developmental toxicity studies, DAURISMO can cause fetal harm when administered to a pregnant woman [see Clinical Pharmacology (12.1)]. There are no clinical data on the use of DAURISMO in pregnant women to inform of a drug-associated risk of major birth defects and miscarriage. DAURISMO is not recommended for use during pregnancy. Conduct pregnancy testing in female patients of reproductive potential prior to initiating treatment with DAURISMO. Report pregnancy exposures to Pfizer at 1-800-438-1985.
In animal embryo-fetal developmental toxicity studies, repeat-dose oral administration of DAURISMO during organogenesis at maternal exposures that were less than the human exposure at the recommended dose resulted in embryotoxicity, fetotoxicity and teratogenicity in rats and rabbits (see Data). Advise pregnant women of the potential risk to a fetus.
The estimated background risk of major birth defects and miscarriage for the indicated population are unknown. Adverse outcomes in pregnancy occur regardless of the health of the mother or the use of medications. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.
Data
Animal Data
In embryo-fetal developmental toxicity studies, glasdegib was orally administered to pregnant rats and rabbits at doses up to 100 mg/kg/day during the period of organogenesis. Glasdegib resulted in embryo-fetal lethality (e.g., increased postimplantation loss and decreased numbers of live fetuses) in rats and rabbits at 50 mg/kg/day and 5 mg/kg/day, respectively, at maternal exposures approximately 4-times and 3-times the human exposure at the recommended dose [based on Cmax (rat) and AUC (rabbit)]. Doses of ≥ 10 mg/kg in rat [approximately 0.6-times the human exposure (Cmax) at the recommended dose] and ≥ 5 mg/kg in rabbit resulted in fetal developmental abnormalities and malformations consisting of craniofacial malformations, malformed limbs, paws/digits, trunk and tail, dilation of brain, malpositioned/malformed eyes, misshapen head, small tongue, absent palate, teeth and viscera, diaphragmatic hernia, edema, heart defects, rib and vertebral abnormalities, malformed or absent structures in the appendicular skeleton.
Risk Summary
There are no data on the presence of glasdegib or its active metabolites in human milk, the effects of the drug on the breastfed child, or its effect on milk production. Because of the potential for serious adverse reactions in a breastfed child from DAURISMO, advise women who are taking DAURISMO not to breastfeed or provide breast milk to infants or children during treatment with DAURISMO and for at least 30 days after the last dose.
Pregnancy Testing
Conduct pregnancy testing in females of reproductive potential within 7 days prior to initiating therapy with DAURISMO.
Contraception
Females
Advise females of reproductive potential to use effective contraception during treatment with DAURISMO and at least 30 days after the last dose.
Males
It is not known if glasdegib is present in semen. Advise males of the potential risk of exposure through semen and to use effective contraception, including a condom, even after a vasectomy, to avoid drug exposure to a pregnant partner or a female partner of reproductive potential during treatment with DAURISMO and for at least 30 days after the last dose. Advise males to not donate semen during treatment with DAURISMO for at least 30 days after the last dose [see Nonclinical Toxicology (13.1)].
Infertility
Males
Based on findings in repeat-dose animal toxicity studies in rats, DAURISMO may impair fertility in males of reproductive potential. Some effects on male reproductive organs did not recover [see Nonclinical Toxicology (13.1)]. Men should seek advice on effective fertility preservation before treatment.
Cardiac Electrophysiology
The effect of glasdegib administration on corrected QT interval (QTc) was evaluated in a randomized, single-dose, double-blind, 4-way crossover, placebo- and open-label moxifloxacin-controlled study in 36 healthy subjects. At therapeutic plasma concentrations for the recommended dose, achieved with a single dose of 150 mg DAURISMO, the largest placebo and baseline-adjusted QTc interval change was 8 ms (90% CI: 6, 10 ms). At a two-fold therapeutic plasma concentration, achieved with a single dose of 300 mg DAURISMO, the QTc change was 13 ms (90% CI: 11, 16 ms). Glasdegib is associated with concentration-dependent QTc prolongation.
Absorption
The mean absolute bioavailability of DAURISMO is 77%. Following 100 mg once daily dosing, glasdegib median time to peak concentrations (Tmax) at steady-state ranged from 1.3 hours to 1.8 hours.
Effect of Food: A high-fat, high-calorie meal (total 800–1000 calories: 500–600 fat calories, 250 carbohydrate calories and 150 protein calories) reduced area under the curve over time to infinity (AUCinf) by 16% and Cmax by 31%.
Distribution
Glasdegib is 91% bound to human plasma proteins in vitro. The geometric mean (%CV) apparent volume of distribution (Vz/F) was 188 L (20%) in patients with hematologic malignancies.
Elimination
Glasdegib has a mean (± SD) half-life of 17.4 h (3.7) and geometric mean (%CV) apparent clearance of 6.45 L/h (25%) following 100 mg once daily dosing in patients with hematologic malignancies.
Metabolism
Glasdegib is primarily metabolized by the CYP3A4 pathway, with minor contributions by CYP2C8 and UGT1A9. Glasdegib accounts for 69% of the total circulating drug related material in plasma.
Excretion
Following a single oral dose of 100 mg radiolabeled glasdegib, 49% (17% unchanged) of the administered dose was eliminated in the urine and 42% (20% unchanged) of the administered dose was eliminated in the feces.
Specific Populations
Age (25 to 92 years), sex, race (White, Black, Asian), body weight (43.5 to 145.6 kg), mild hepatic impairment (total bilirubin ≤ ULN and AST > ULN, or total bilirubin 1–1.5 × ULN and any AST) or mild to moderate renal impairment (creatinine clearance [CLcr] 30–89 mL/min) did not have clinically meaningful effects on the pharmacokinetics of glasdegib. The effect of moderate (total bilirubin 1.5–3 × ULN and any AST) and severe (total bilirubin > 3 × ULN and any AST) hepatic impairment or severe renal impairment (CLcr 15–29 mL/min) on glasdegib pharmacokinetics is unknown.
Drug Interaction Studies
Clinical Studies
Effect of Strong CYP3A4 Inhibitors on Glasdegib:
Coadminstration of ketoconazole (a strong inhibitor of CYP3A4) with DAURISMO increased the glasdegib AUCinf by 2.4-fold and Cmax by 1.4-fold over glasdegib given alone [see Drug Interactions (7)].
Effect of Strong CYP3A4 Inducers on Glasdegib:
Coadminstration of rifampin (a strong inducer of CYP3A4) with DAURISMO decreased glasdegib AUCinf by 70% and Cmax by 35% [see Drug Interactions (7)].
Effect of Gastric Acid Reducing Agents on Glasdegib:
Coadministration of rabeprazole (a proton pump inhibitor) with DAURISMO did not alter glasdegib AUCinf but decreased Cmax by 20%.
In Vitro Studies
Effect of Glasdegib on Cytochrome P450 (CYP) Substrates:
Glasdegib does not inhibit CYP1A2, CYP2B6, CYP2C8, CYP2C9, CYP2C19, CYP2D6, or CYP3A, and does not induce CYP1A2, CYP2B6, and CYP3A in vitro.
Effect of Transporters on Glasdegib:
Glasdegib is a substrate of P-glycoprotein (P-gp) and breast cancer resistance protein (BCRP).
Effect of Glasdegib on Transporters:
Glasdegib inhibits P-gp, BCRP, multidrug and toxin extrusion (MATE) protein 1, and MATE-2K, but not organic anion transporting polypeptide (OATP)1B1, OATP1B3, organic anion transporter (OAT)1, OAT3, and organic cation transporter (OCT)2 in vitro.
Embryo-Fetal Toxicity