A Combination Study of PF-04449913 (Glasdegib) and Azacitidine In Untreated MDS, AML and CMML Patients

An adverse event (AE) was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship with the study treatment. TEAEs were AEs that occurred after initiation of treatment or AEs increasing in severity during treatment. Treatment-related TEAEs were determined by the investigator. Grades of AEs were defined by National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) version 4.03.Grade 1=asymptomatic/mild symptoms, clinical or diagnostic observations only, intervention not indicated; Grade 2=minimal, local or noninvasive intervention indicated, limiting age-appropriate instrumental activity of daily living (ADL); Grade 3=severe or medically significant but not immediately life-threatening, hospitalization of prolongation of hospitalization indicated; disabling limiting self-care ADL; Grade 4=events with life-threatening consequences, urgent intervention indicated; Grade 5= death related to AE.

A serious adverse event (SAE) was any untoward medical occurrence at any dose that resulted in death; was life threatening; required inpatient hospitalization or prolongation of existing hospitalization; resulted in persistent or significant disability/incapacity; resulted in congenital anomaly/birth defect. Treatment-related SAEs were determined by the investigator.

Hematology lab parameters included activated partial thromboplastin time, hemoglobin, prothrombin international normalized ratio, lymphocyte, neutrophil, platelet, white blood cell; chemistry parameters included alanine aminotransferase, aspartate aminotransferase, alkaline aminotransferase, blood bilirubin, creatine phosphokinase, creatinine, calcium, blood glucose, potassium, magnesium, sodium, albumin, phosphate. Grades of lab abnormalities were defined by NCI CTCAE version 4.03. Grade 1(mild)=asymptomatic or mild symptoms, clinical or diagnostic observations only, intervention not indicated;Grade 2(moderate)=minimal, local or noninvasive intervention indicated, limiting age-appropriate instrumental ADL;Grade 3=severe or medically significant but not immediately life-threatening, hospitalization or prolongation of hospitalization indicated; disabling limiting self-care ADL;Grade 4=life-threatening consequences, urgent intervention indicated. Grade 1-4 results are reported.

Percentage of participants achieving CR as defined by the 2017 European Leukemia Net (ELN) Response Criteria for all participants with AML and modified International Working Group (IWG) criteria (2006) for all participants with MDS in the expansion cohorts.

For AML cohort, CR was defined as neutrophils ≥ 1 x 10^9/L, platelets ≥ 1 x 10^11/L, percentage of bone marrow blasts (BMB) <5% with no peripheral blasts and no blasts with Auer rods, no extramedullary disease (EMD), and transfusion independent.

For MDS cohort, CR was defined as having responses of hemoglobin ≥11 g/dL, neutrophils ≥1 x 10^9/L, platelets ≥1 x 10^11/L, percentage of blasts = 0%, percentage of BMB≤5%, and normal maturation of all cell lines (note if has persistent dysplasia), and all responses must last at least 4 weeks.

Response rate (Percentage of participants achieving CR + PR among all the enrolled and treated patients) as defined by modified International Working Group (IWG) criteria (2006) in the LIC. CR was defined as having responses of hemoglobin ≥11 g/dL, neutrophils ≥1 x 10^9/L, platelets ≥1 x 10^11/L, percentage of blasts = 0%, percentage of BMB≤5%, and normal maturation of all cell lines (note if has persistent dysplasia), and all responses must last at least 4 weeks. PR was defined as meeting all CR criteria if abnormal before treatment except BMB, percentage of BMB decreased by ≥50% but still >5% for at least 4 weeks.

Number of participants with efficacy measures other than CR as defined by modified IWG criteria (2006) in LIC, including marrow CR(mCR), stable disease(SD), hematologic improvement(HI). CR: hemoglobin≥11 g/dL, neutrophils≥1 x 10^9/L, platelets≥1 x 10^11/L, percentage of blasts=0%, percentage of BMB≤5%, normal maturation of all cell lines (note if has persistent dysplasia), all responses last at least 4 weeks. mCR: BMB≤5% & decreased by≥50%. SD: failure to achieve PR, no evidence of progression. HI: erythroid response (pretreatment<11g/dL): hemoglobin increase by≥1.5 g/dL, relevant reduction of units of red blood cell transfusions by at least 4 transfusions/8 weeks compared to pretreatment transfusion number in previous 8 weeks; platelet response (pretreatment<1x10^11/L): increase of≥30x10^9/L if starting with >20x10^9/L, and increase from <20x10^9/L to >20x10^9/L and by at least 100%; neutrophil response (pretreatment<1x10^9/L): at least a 100% increase, absolute increase >0.5x10^9/L

An AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship with the study treatment. TEAEs were AEs that occurred after initiation of treatment or AEs increasing in severity during treatment. Treatment-related TEAEs were determined by the investigator. Grades of AEs were defined by NCI CTCAE version 4.03.Grade 1=asymptomatic/mild symptoms, clinical or diagnostic observations only, intervention not indicated; Grade 2=minimal, local or noninvasive intervention indicated, limiting age-appropriate instrumental ADL; Grade 3=severe or medically significant but not immediately life-threatening, hospitalization of prolongation of hospitalization indicated; disabling limiting self-care ADL; Grade 4=events with life-threatening consequences, urgent intervention indicated; Grade 5= death related to AE.

An SAE was any untoward medical occurrence at any dose that resulted in death; was life threatening; required inpatient hospitalization or prolongation of existing hospitalization; resulted in persistent or significant disability/incapacity; resulted in congenital anomaly/birth defect. Treatment-related SAEs were determined by the investigator.

Hematology lab parameters included activated partial thromboplastin time, hemoglobin, prothrombin international normalized ratio, lymphocyte, neutrophil, platelet, white blood cell; chemistry parameters included alanine aminotransferase, aspartate aminotransferase, alkaline aminotransferase, blood bilirubin, creatine phosphokinase, creatinine, calcium, blood glucose, potassium, magnesium, sodium, albumin, phosphate. Grades of lab abnormalities were defined by NCI CTCAE version 4.03. Grade 1(mild)=asymptomatic or mild symptoms, clinical or diagnostic observations only, intervention not indicated;Grade 2(moderate)=minimal, local or noninvasive intervention indicated, limiting age-appropriate instrumental ADL;Grade 3=severe or medically significant but not immediately life-threatening, hospitalization or prolongation of hospitalization indicated; disabling limiting self-care ADL;Grade 4=life-threatening consequences, urgent intervention indicated. Grade 1-4 results are reported.

Number of participants with partial hematologic recovery (CRh), CR with incomplete blood count recovery (CRi), partial remission (PR), stable disease (SD), and morphologic leukemia free state (MLFS). CRh: neutrophils>5x10^8/L, platelets>5x10^10/L, BMB<5%, no peripheral blasts, no blasts with Auer rods, no extramedullary disease (EMD), not qualifying for CR. CRi: neutrophils <1x10^9/L or platelets<1x10^11/L; BMB <5%, no peripheral blasts, no blasts with Auer rods; no EMD; neutrophils or platelets not recovered; not qualifying for CRh. PR: neutrophils ≥1x10^9/L; platelets ≥1x10^11/L; blasts decreased to 5-25% and ≥50% decrease from pretreatment; blasts≤5% if Auer rod positive. SD: ≥3 months of absence of CR without minimal residual disease (CRMRD-), CR, CRh, CRi, PR, and MLFS, criteria for PD not met. MLFS: neutrophils <1x10^9/L and platelets<1x10^11/L, BMB<5%, no blasts with Auer rods; no EMD; neutrophils and platelets not recovered; not qualifying for CRi

Number of participants with PR, mCR, SD, complete or partial cytogenetic response, and HI. PR: BMB >5% and decreased by ≥50% (at least 4 weeks), meeting all CR criteria if abnormal before treatment except BMB. mCR: BMB ≤5% and decreased by ≥50%. SD: failure to achieve PR, no evidence of progression. Complete or partial cytogenic response: disappearance of chromosomal abnormality without new ones, or ≥ 50% reduction of chromosomal abnormality. HI: erythroid response (pretreatment <11g/dL): hemoglobin increase by≥1.5 g/dL, relevant reduction of units of red blood cell transfusions by at least 4 transfusions/8 weeks compared to pretreatment transfusion number in previous 8 weeks; platelet response (pretreatment <1x10^11/L): increase of ≥30x10^9/L if starting with >20x10^9/L, and increase from <20x10^9/L to >20x10^9/L and by at least 100%; neutrophil response (pretreatment <1x10^9/L): at least a 100% increase, absolute increase >0.5x10^9/L.

Overall survival (OS) was defined as the time from date of first study treatment to date of death from any cause. Patients last known to be alive were to be censored at the date of last contact. OS was analyzed and displayed graphically for each expansion cohort separately using the Kaplan-Meier method. The median event time and corresponding two-sided 95%CI were provided for each cohort. OS was first analyzed when the primary endpoint of CR was analyzed in the respective expansion cohort.

Duration of CR was defined as the duration from date of first achieving CR to the date of disease progression (relapse) after CR, or death due to any cause. Participants last known to be alive who were free from disease progression or relapse after CR were censored at the date of the last assessment that verified their disease status. Duration of CR was analyzed using the Kaplan-Meier method. Disease progression was defined as: percentage of bone marrow blasts increased by ≥50% to >5% (for participants with <5% blasts at screening), >10% (for participants with 5-10% blasts at screening), >20% (for participants with 11-20% blasts at screening) or >30% (for participants with 21-30% blasts at screening), and with any of the following condition: at least 50% decrease from maximum remission/response in granulocytes or platelets; reduction in hemoglobin by ≥2 g/dL; transfusion dependence.

Time to CR was defined for participants in the expansion cohorts who had achieved response on study as the time from date of the first dose of study drug to date of the first documentation of response. Time to CR was analyzed using the Kaplan-Meier method.

Maximum plasma concentration of glasdegib dosed in combination with azacitidine (C1D7) and when dosed alone (C1D15) in the Lead-in Cohort was estimated using non-compartmental analysis.

Area under the plasma concentration curve from time zero to end of dosing interval (AUCtau) of glasdegib dosed in combination with azacitidine (C1D7) and when dosed alone (C1D15) in the Lead-in Cohort was estimated using non-compartmental analysis.

Time to first occurrence of maximum plasma concentration of glasdegib dosed in combination with azacitidine (C1D7) and when dosed alone (C1D15) in the Lead-in Cohort was estimated using non-compartmental analysis.

Maximum plasma concentration of azacitidine dosed in combination with glasdegib (C1D7) and when dosed alone (C1D1) in the Lead-in Cohort was estimated using non-compartmental analysis.

Area under the plasma concentration curve from time zero to extrapolated infinite time of azacitidine dosed in combination with glasdegib (C1D7) and when dosed alone (C1D1) in the Lead-in Cohort was estimated using non-compartmental analysis.

Time to first occurrence of maximum plasma concentration of azacitidine dosed in combination with glasdegib (C1D7) and when dosed alone (C1D1) in the Lead-in Cohort was estimated using non-compartmental analysis.

Trough plasma concentration was defined as the estimated lowest concentration before next dose administration.

Number of participants that met categorical criteria of QTcF values in LIC, AML and MDS cohorts