2.1 Recommended Dosage and Schedule

The recommended dosage of DAURISMO is 100 mg orally once daily on days 1 to 28 in combination with cytarabine 20 mg subcutaneously twice daily on days 1 to 10 of each 28-day cycle in the absence of unacceptable toxicity or loss of disease control. For patients without unacceptable toxicity, treat for a minimum of 6 cycles to allow time for clinical response.

Administer DAURISMO with or without food. Do not split or crush DAURISMO tablets. Administer DAURISMO about the same time each day. If a dose of DAURISMO is vomited, do not administer a replacement dose; wait until the next scheduled dose is due. If a dose of DAURISMO is missed or not taken at the usual time, administer the dose as soon as possible and at least 12 hours prior to the next scheduled dose. Return to the normal schedule the following day. Do not administer 2 doses of DAURISMO within 12 hours.

2.2 Monitoring and Dosage Modifications

Assess complete blood counts, electrolytes, renal, and hepatic function prior to the initiation of DAURISMO and at least once weekly for the first month. Monitor electrolytes and renal function once monthly for the duration of therapy. Obtain creatine phosphokinase (CPK) levels prior to initiating DAURISMO and as indicated clinically thereafter (e.g., if muscle symptoms are reported). Monitor electrocardiograms (ECGs) prior to the initiation of DAURISMO, approximately one week after initiation, and then once monthly for the next two months to assess for QTc prolongation. Repeat ECG if abnormal. Certain patients may require more frequent and ongoing ECG monitoring [see Warnings and Precautions (5.2)]. Manage any abnormalities promptly [see Adverse Reactions (6.1)].

See Table 1 for dosage modification guidelines for patients who develop an adverse reaction.

2.3 Dosage Modification for Concomitant Use with Moderate CYP3A4 Inducers

Avoid concomitant use of DAURISMO with moderate CYP3A4 inducers. If concomitant use of moderate CYP3A4 inducers cannot be avoided, increase the DAURISMO dosage as tolerated as shown in Table 2. After the moderate CYP3A4 inducer has been discontinued for 7 days, resume the DAURISMO dose taken prior to initiating the moderate CYP3A4 inducer [see Drug Interactions (7), Clinical Pharmacology (12.3)].

5.1 Embryo-Fetal Toxicity

Based on its mechanism of action and findings from animal embryo-fetal developmental toxicity studies, DAURISMO can cause embryo-fetal death or severe birth defects when administered to a pregnant woman. There are no clinical data on the use of DAURISMO in pregnant women. In animal embryo-fetal developmental toxicity studies, glasdegib caused embryotoxicity, fetotoxicity and teratogenicity at maternal exposures that were less than the human exposure at the recommended human dose of 100 mg [see Use in Specific Populations (8.1, 8.2), Clinical Pharmacology (12.1)]. Advise pregnant women of the potential risk to the fetus.

5.2 QTc Interval Prolongation

Patients treated with DAURISMO can develop QTc prolongation and ventricular arrhythmias, including ventricular fibrillation and ventricular tachycardia. Of the 98 evaluable patients treated with DAURISMO 100 mg in combination with low-dose cytarabine in the clinical trial, 5% were found to have a QTc interval greater than 500 ms and 4% of patients had an increase from baseline QTc greater than 60 ms. The clinical trial excluded patients with baseline QTc of greater than 470 ms or with a history of long QT syndrome or uncontrolled cardiovascular disease.

Monitor electrocardiograms (ECGs) and electrolytes [see Dosage and Administration (2.2)]. Concomitant use of DAURISMO with drugs known to prolong the QTc interval and CYP3A4 inhibitors may increase the risk of QTc interval prolongation [see Drug Interactions (7), Clinical Pharmacology (12.2)]. In patients with congenital long QT syndrome, congestive heart failure, electrolyte abnormalities, or those who are taking medications known to prolong the QTc interval, more frequent ECG monitoring is recommended.

Interrupt DAURISMO if QTc increases to greater than 500 ms. Discontinue DAURISMO permanently for patients who develop QTc interval prolongation with signs or symptoms of life-threatening arrhythmia [see Dosage and Administration (2.2)].

5.3 Musculoskeletal Adverse Reactions

Musculoskeletal adverse reactions, which may be accompanied by CPK elevations, have occurred with DAURISMO and other drugs which inhibit the hedgehog (Hh) pathway. In BRIGHT AML 1003, musculoskeletal adverse reactions occurred in 45% of patients treated, with 2% (7/79) reported as Grade 3 or higher. The most frequent manifestations of musculoskeletal adverse reactions reported were musculoskeletal pain (30%) and muscle spasms (15%). Increased CPK laboratory values occurred in 16% of patients [see Adverse Reactions (6.1)].

Obtain baseline CPK levels prior to initiating DAURISMO and as clinically indicated (e.g., if muscle symptoms are reported). Obtain CPK and serum creatinine levels at least weekly in patients with musculoskeletal adverse reactions with concurrent CPK elevation greater than 2.5 times ULN until resolution of clinical signs and symptoms. Depending on the severity of symptoms, temporary dose interruption, dose reduction, or discontinuation of DAURISMO may be required for musculoskeletal adverse reactions or serum CPK elevation [see Dosage and Administration (2.2)].

6.1 Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

The safety profile of DAURISMO is based on experience in the BRIGHT AML 1003 study for 111 adults with newly-diagnosed AML and 14 adults with other conditions for which DAURISMO is not indicated [see Clinical Studies (14)]. Patients were treated with DAURISMO 100 mg daily in combination with low-dose cytarabine (N=84) or low-dose cytarabine alone (N=41). The median duration of treatment in the DAURISMO with low-dose cytarabine arm was 83 days (range 3 to 972 days), and the median duration of treatment in the low-dose cytarabine alone arm was 47 days (range 6 to 239 days). The median exposure to DAURISMO in the DAURISMO with low-dose cytarabine arm was 76 days (range 3 to 954 days). Thirty-two patients (38%) were treated with DAURISMO with low-dose cytarabine for at least 6 months and 14 patients (17%) were treated for at least 1 year.

Serious adverse reactions were reported in 79% of patients treated in the DAURISMO with low-dose cytarabine arm. The most common (≥5%) serious adverse reactions in patients receiving DAURISMO with low-dose cytarabine were febrile neutropenia (29%), pneumonia (23%), hemorrhage (12%), anemia (7%), and sepsis (7%).

Dose reductions associated with adverse reactions were reported in 26% of patients treated with DAURISMO with low-dose cytarabine, and the most common reasons (≥2%) for dose reductions due to adverse reactions were muscle spasms (5%), fatigue (4%), febrile neutropenia (4%), anemia (2%), thrombocytopenia (2%), and ECG QT prolonged (2%). Adverse reactions leading to permanent discontinuation were reported in 36% of patients treated with DAURISMO with low-dose cytarabine, and the most common (≥2%) reasons for permanent discontinuation were pneumonia (6%), febrile neutropenia (4%), sepsis (4%), sudden death (2%), myocardial infarction (2%), nausea (2%), and renal insufficiency (2%).

Adverse reactions reported in the first 90 days of therapy on the BRIGHT AML 1003 study are shown in Table 3.

The adverse reactions muscle spasms (4 in 12 patients) and decreased appetite (2 in 10 patients) worsened (i.e. progressed from Grades ≤ 2 to Grade 3 or higher) after the first 90 days of therapy in BRIGHT AML 1003.

Additional clinically-significant adverse reactions occurring in < 10% of patients treated with DAURISMO and low-dose cytarabine in BRIGHT AML 1003 include:

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Dental disorders: loose tooth and toothache

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Skin and subcutaneous tissue disorders: alopecia

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Cardiac disorders: QT interval prolonged

Changes in selected post-baseline laboratory values that were observed in patients with newly-diagnosed AML and other conditions for which DAURISMO is not indicated in the clinical trial are shown in Table 4.

The following laboratory abnormalities worsened (i.e. progressed from Grades ≤ 2 to Grade 3 or higher) after the first 90 days of therapy in BRIGHT AML 1003:

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hypophosphatemia (8 in 38 patients), creatinine increased (2 in 39 patients), and ALT increased (2 in 40 patients).

8.1 Pregnancy

8.2 Lactation

8.3 Females and Males of Reproductive Potential

DAURISMO can cause fetal harm when administered to a pregnant woman [see Use in Specific Populations (8.1)].

8.4 Pediatric Use

The safety and effectiveness of DAURISMO have not been established in pediatric patients. In repeat-dose toxicity studies in rats, oral administration of DAURISMO resulted in adverse changes in growing bone, teeth, and testis. Effects on bone consisted of partial to complete closure of the epiphyseal plate. Effects in growing incisor teeth included degeneration/necrosis of ameloblasts, and complete tooth loss with oral ulceration. Reproductive tissue toxicity was evidenced by testicular degeneration and hypospermatogenesis. These effects in bone, teeth and testis were observed after administration of DAURISMO for 26 weeks at greater than or equal to 50 mg/kg/day corresponding to approximately 6.6-times the steady state AUC in patients at the recommended human dose.

8.5 Geriatric Use

Of the total number of subjects in clinical studies of DAURISMO with low-dose cytarabine (N=88), 98% of the patients were age 65 years or older and 60% of the patients were age 75 years or older. There were insufficient patients younger than age 65 years to determine differences in adverse reactions reported from patients older than 65.

8.6 Renal Impairment

No dosage modification is recommended for patients with mild to severe renal impairment (estimated glomerular filtration rate [eGFR] 15 to 89 mL/min). Monitor patients with severe renal impairment (eGFR 15 to 29 mL/min) for increased risk of adverse reactions, including QTc interval prolongation, due to increased glasdegib concentrations [see Clinical Pharmacology (12.3)].

12.1 Mechanism of Action

Glasdegib is an inhibitor of the Hedgehog pathway. Glasdegib binds to and inhibits Smoothened, a transmembrane protein involved in hedgehog signal transduction.

In a murine xenotransplant model of human AML, glasdegib in combination with low-dose cytarabine, inhibited increases in tumor size and reduced the percentage of CD45+/CD33+ blasts in the marrow to a greater extent than glasdegib or low-dose cytarabine alone.

12.2 Pharmacodynamics

12.3 Pharmacokinetics

DAURISMO at 5 mg to 600 mg once daily (0.05 to 6 times the recommended dose) result in a dose proportional increase in glasdegib peak concentrations (Cmax) and area under the curve over the dosing interval (AUC0-Tau). Steady-state plasma levels are reached by 8 days of daily dosing. The median accumulation ratio of glasdegib ranged from 1.2 to 2.5 following once-daily dosing.

At DAURISMO 100 mg once daily, the geometric mean (geometric coefficient of variation, % CV) of glasdegib Cmax was 1252 ng/mL (44%) and AUC0-Tau was 17210 ng*hr/mL (54%) in patients with cancer.

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

Carcinogenicity studies have not been performed with glasdegib.

Glasdegib was not mutagenic in vitro in the bacterial reverse mutation (Ames) assay and was not clastogenic in the in vitro chromosome aberration assay in human lymphocytes. Glasdegib was not clastogenic or aneugenic in the rat micronucleus assay.

Based on nonclinical safety findings, glasdegib has the potential to impair reproductive function in males. Men should seek advice on effective fertility preservation before treatment. In repeat-dose toxicity studies in rats, findings observed in the male reproductive tract included adverse testicular changes with glasdegib at doses ≥50 mg/kg/day, and consisted of minimal to severe hypospermatogenesis characterized by partial to complete loss of spermatogonia, spermatocytes and spermatids and testicular degeneration. Hypospermatogenesis did not recover whereas testicular degeneration did recover. The dose at which testicular effects were observed in male rats was identified as 50 mg/kg/day with corresponding systemic exposures that were approximately 6.6-times (based on AUC) those associated with the observed human exposure at the 100 mg once daily dose.

Store at 20°C to 25°C (68°F to 77°F); excursions permitted between 15°C to 30°C (59°F to 86°F).

Embryo-Fetal Toxicity

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Advise female patients of the potential risk to a fetus and to inform their healthcare provider of a known or suspected pregnancy. Advise female patients and female partners of male patients to contact their healthcare provider with a known or suspected pregnancy [see Warnings and Precautions (5.1), Use in Specific Populations (8.1, 8.3)].

Females and Males of Reproductive Potential

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Advise females of reproductive potential to use effective contraception during treatment with DAURISMO and for at least 30 days after the last dose.

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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 [see Use in Specific Populations (8.3)].

Semen Donation

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Advise males not to donate semen during treatment with DAURISMO and for at least 30 days after the last dose of DAURISMO[see Use in Specific Populations (8.3)].

Lactation

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Advise women not to breastfeed during treatment with DAURISMO and for at least 30 days after the last dose of DAURISMO [see Use in Specific Populations (8.2)].

Blood Donation

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Advise patients not to donate blood or blood products during treatment with DAURISMO and for at least 30 days after the last dose of DAURISMO [see Warnings and Precautions (5.1)].

Infertility

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Advise males of reproductive potential of the potential for impaired fertility from DAURISMO. Advise male patients to seek advice on effective fertility preservation before treatment [see Use in Specific Populations (8.3), Nonclinical Toxicology (13.1)].

QTc Interval Prolongation

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Inform patients of signs and symptoms that may be indicative of significant QTc interval prolongation. Advise patients to contact their healthcare provider immediately in the event of syncope, pre-syncopal symptoms, and cardiac palpitations [see Warnings and Precautions (5.2)].

Musculoskeletal Adverse Reactions

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Advise patients starting therapy with DAURISMO of the risk of muscle-related adverse reactions.

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Advise patients to report promptly any new unexplained muscle pain, tenderness, or weakness occurring during treatment or that persists after discontinuing DAURISMO [see Warnings and Precautions (5.3)].