A Phase 2, Double-blind, Randomized Safety And Efficacy Study Of Glasdegib (Pf-04449913) Versus Placebo In Patients With Myelofibrosis Previously Treated With Ruxolitinib

Percentage of Participants Achieving Spleen Volume Reduction (SVR) ≥35% as Measured by Magnetic Resonance Imaging (MRI)/Computed Tomography (CT) Scan at Week 24 in the Randomized Cohort

Time Frame: Week 24

The double blind, randomized, placebo controlled phase of the study was not enrolled after the study was terminated early so no data were collected to assess this endpoint.

Number of Participants With Treatment Emergent Treatment -Related Adverse Events (AEs) and Serious Adverse Events (SAEs): Lead-in Cohort

Time Frame: Baseline up to Week 131

Treatment-related AE was any untoward medical occurrence attributed to study drug in a participant who received study drug. SAE was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. Treatment-emergent were events between first dose of study drug and up to 28 days after last dose of study drug (up to Week 131) that were absent before treatment or that worsened relative to pre-treatment state. Relatedness to study drug was assessed by the investigator. AEs included both serious and non-serious adverse event.

Number of Participants With Treatment -Emergent Adverse Events (AEs) and Serious Adverse Events (SAEs): Lead-in Cohort

Time Frame: Baseline up to Week 131

An AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. SAE was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. Treatment-emergent were events between first dose of study drug and up to 28 days after last dose of study drug (up to Week 131) that were absent before treatment or that worsened relative to pretreatment state. AEs included both serious and non-serious adverse events.

Number of Participants With Treatment Emergent Adverse Events (AEs) According to National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE), Version 4.03: Lead-in Cohort

Time Frame: Baseline up to Week 131

AE was untoward medical occurrence in participant who received study drug without regard to possibility of causal relationship. SAE was AE resulting in any outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience; persistent or significant disability; congenital anomaly.Treatment-emergent were events between first dose of study drug and up to 28 days after last dose of study drug (up to Week 131) that were absent before treatment or that worsened relative to pretreatment state.AE were assessed according to maximum severity grading based on NCI CTCAE Version 4.03.Grade 1=mild; Grade 2=moderate; within normal limits. Grade 3=severe or medically significant but not immediately life-threatening; Grade 4=life-threatening or disabling; urgent intervention indicated; Grade 5=death. Only categories with at least 1 participant with event were reported.

Number of Participants With Laboratory Test Abnormalities According to National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE), Version 4.03 Grade 3 and Above Chemistry Test Abnormalities: Lead-in Cohort

Time Frame: Baseline up to Week 131

ALT/AST g1:\>ULN 3\*ULN, g2:\>3-5\*ULN, g3:\>5 20\*ULN, g4:\>20\*ULN); Alkaline Phosphatase (g1:\>ULN 2.5\*ULN,g2:\>2.5-5\*ULN, g3:\>5 20\*ULN, g4:\>20\*ULN); Creatinine (g1:\>ULN-1.5\*ULN,g2:\>1.5-3\*ULN, g3:\>3 6\*ULN, g4:\>6\*ULN);hyperglycemia (g1:\>ULN-160,g2:\>160 250, g3:\>250 500, g4:\>500mg/dL);bilirubin(total) (g1:\>ULN-1.5\*ULN, g2:\>1.5-3\*ULN, g3:\>3 10\*ULN,g4:\>10\*ULN);hypoglycaemia (g1:\<LLN-55,g2:\<55-40, g3:\<40 30,g4:\<30mg/dL); hyperkalemia (g1:\>ULN-5.5,g2:\>5.5-6, g3:\>6 7,g4:\>7mmol/L);hypokalemia (g1:\<LLN-3,g2:\<LLN-3, g3:\<3 2.5, g4:\<2.5mmol/L);hypermagnesemia (g1:\>ULN-3,g3:\>3 8, g4:\>8mg/dL);hypocalcemia (g1:\<LLN-8,g2:\<8-7, g3:\<7-6, g4:\<6mg/dL); hypercalcemia (g1:\>ULN-11.5,g2:\>11.5-12.5, g3:\>12.5-13.5, g4:\>13.5mg/dL); hypomagnesemia (g1:\<LLN-1.2,g2:\<1.2-0.9,g3:\<0.9-0.7, g4:\<0.7mg/dL); hyponatremia (g1:\<LLN-130,g3:\<130-120, g4:\<120mmol/L);hypoalbuminemia (g1:\<LLN-3,g2:\<3 2,g3:\<2, g4:lifethreatening);hypophosphatemia (g1:\<LLN-2.5,g2:\<2.5-2, g3:\<2-1, g4:\<1mg/dL).

Number of Participants With Laboratory Abnormalities: Lead-in Cohort

Time Frame: Baseline up to Week 131

Abnormality: hematology: hemoglobin less than (\<)0.8\*lower limit of normal(LLN), platelets \<0.5\*LLN greater than (\>)1.75\*upper limit of normal(ULN), white blood cell count(WBC) \<0.6\* LLN \>1.5\* ULN,lymphocytes, total neutrophils\<0.8\* LLN \>1.2\* ULN, band Cells, basophils, eosinophils, monocytes \>1.2\*ULN, blast cells \>1.0\*ULN. Coagulation: activated partial thromboplastin time, prothrombin international ratio \>1.1\* ULN. Liver function: bilirubin \>1.5\*ULN, AST, ALT,lactate dehydrogenase,alkaline phosphatase \>3.0\*ULN, protein,albumin \<0.8\* LLN \>1.2\* ULN. Renal:blood urea nitrogen,creatinine \>1.3\*ULN,uric acid \>1.2\*ULN.Electrolytes: sodium \<0.95\*LLN \>1.05\*ULN, potassium, chloride, calcium, magnesium \<0.9\* LLN \>1.1\*ULN,phosphate \<0.8\* LLN \>1.2\* ULN.Chemistry: glucose \<0.6\*LLN \>1.5\*ULN,creatine kinase \>2.0\*ULN, amylase,lipase \>1.5\*ULN.Urinalysis: protein, blood \>1.0\*ULN,red blood cells,WBC \>=20,epithelial cells \>=6,casts,granular casts,hyaline \>1,cellular casts,crystals\>=1,bacteria \>20.

Number of Participants With Laboratory Test Abnormalities According to National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE), Version 4.03 Grade 3 and Above Hematological Test Abnormalities: Lead-in Cohort

Time Frame: Baseline up to Week 131

Anemia (grade \[g\]1:\< LLN to 10 gram per deciliter \[g/dL\],g2:\<10 to 8g/dL,g3:\<8g/dL, g4:lifethreatening); platelet (g1:\<LLN to 75\*10\^3/millimeter\[mm\]\^3, g2:\<75\*10\^3/mm\^3 to 50\*10\^3/mm\^3, g3:\<50\*10\^3/mm\^3 to 25\*10\^3/mm\^3, g4:\<25\*10\^3/mm\^3); lymphopenia (g1:\<LLN to 8\*10\^2/mm\^3, g2:\<8\*10\^2 to 5\*10\^2/mm\^3, g3:\<5\*10\^2 to 2\*10\^2/mm\^3, g4:\<2\*10\^2/mm\^3);neutrophil (Absolute) (g1:\<LLN to 15\*10\^2/mm\^3, g2:\<15\*10\^2 to 10\*10\^2/mm\^3, g3:\<10\*10\^2 to 5\*10\^2/mm\^3, g4:\<5\*10\^2/mm\^3); white blood cell count(g1:\<LLN to 3\*10\^3/mm\^3, g2:\<3\*10\^3 to 2\*10\^3/mm\^3, g3:\<2\*10\^3 to 1\*10\^3/mm\^3, g4:\<1\*10\^3/mm\^3); hemoglobin (g1:increase in hemoglobin level \>0 to 2 g/dL above ULN or above baseline if baseline is above ULN, g2:increase in hemoglobin level\>2 to 4g/dL above ULN or above baseline if baseline is above ULN,g3: increase in hemoglobin level\>4 g/dL above ULN or above baseline if baseline is above ULN).