Double Blind, Randomized, 3 Week Inpatient Study To Evaluate The Safety & Efficacy Of PF-02545920 Compared With Placebo

Double Blind, Randomized, 3 Week Inpatient Study To Evaluate The Safety & Efficacy Of PF-02545920 Compared With Placebo

A Phase 2, Multicenter, Double-blind, Randomized, Fixed Dose, Parallel Group, 3-week Inpatient Treatment Study To Evaluate The Safety, Efficacy And Pharmacokinetics Of Pf-02545920 Compared With Placebo In The Treatment Of Acute Exacerbation Of Schizophrenia

To assess the efficacy and safety of an investigational compound PF-02545920 for the treatment of schizophrenia. PF-02545920 will be more effective than placebo in reducing symptoms associated with schizophrenia.

Participants are assigned to 15 mg oral tablets twice a day of PF-02545920 or placebo in parallel for the duration of the study which is 21 days

Participants are assigned to 15 mg oral tablets twice a day of PF-02545920 or placebo in parallel for the duration of the study which is 21 days.

PANSS is a clinician-rated instrument for assessing the positive symptoms, negative symptoms, and general psychopathology specifically associated with schizophrenia. The scale consists of 30 items. Each item is rated on a scale from 1 (symptom not present) to 7 (symptoms extremely severe). PANSS total score is the sum of the 30 items and ranges from 30 to 210; where higher score indicates greater severity of symptoms.

Change From Baseline in Positive and Negative Syndrome Scale (PANSS) at Day 21: Positive Subscale Score

PANSS is a clinician-rated instrument for assessing the positive symptoms, negative symptoms, and general psychopathology specifically associated with schizophrenia. PANSS positive subscale assesses the positive symptoms associated with schizophrenia as delusions, conceptual disorganization, and hallucinatory behavior. It consists of 7 items and each item is rated on a scale from 1 (symptoms not present) to 7 (symptoms extremely severe). PANSS positive subscale is the sum of 7 items and ranges from 7 to 49; where higher score indicates greater severity of symptoms.

Change From Baseline in Positive and Negative Syndrome Scale (PANSS) at Day 21: Negative Subscale Score

PANSS is a clinician-rated instrument for assessing the positive symptoms, negative symptoms, and general psychopathology specifically associated with schizophrenia. PANSS negative subscale assesses negative symptoms associated with schizophrenia as blunted affect, emotional withdrawal, poor rapport, and passive/apathetic social withdrawal. It consists of 7 items and each item is rated on a scale from 1 (symptoms not present) to 7 (symptoms extremely severe). PANSS negative subscale score is the sum of 7 items and ranges from 7 to 49, where higher score indicates greater severity of symptoms.

Change From Baseline in Positive and Negative Syndrome Scale (PANSS) at Day 21: General Psychopathology Subscale Score

PANSS is a clinician-rated instrument for assessing the positive symptoms, negative symptoms, and general psychopathology specifically associated with schizophrenia. PANSS general psychopathology subscale score assesses general psychopathology symptoms associated with schizophrenia as somatic concern, anxiety, guilt feelings, tension, mannerisms/posturing, depression, motor retardation, uncooperativeness, unusual thought content, disoriented, poor attention, lack of judgment/insight, disturbance of volition, poor impulse control, preoccupation, and active social avoidance. It consists of 16 items and each item is rated on a scale from 1 (symptoms absent) to 7 (extreme psychopathology). PANSS general psychopathology subscale score is the sum of 16 items and ranges from 16 to 112; where higher scores indicates greater severity of symptoms.

Change From Baseline in Positive and Negative Syndrome Scale (PANSS) at Day 21: Positive Marder Factor Score

PANSS subscales based on Marder factors assess negative symptoms, positive symptoms, disorganized thoughts factor, uncontrolled hostility/excitement factor, and anxiety/depression factor associated with schizophrenia. PANSS positive Marder factor score consists of 8 items and each item is rated on a scale from 1 (symptoms not present) to 7 (symptoms extremely severe). PANSS positive Marder factor score is the sum of 8 items and ranges from 8 to 56; where higher score indicating greater severity of symptoms.

Change From Baseline in Positive and Negative Syndrome Scale (PANSS) at Day 21: Negative Marder Factor Score

PANSS subscales based on Marder factors assess negative symptoms, positive symptoms, disorganized thoughts factor, uncontrolled hostility/excitement factor, and anxiety/depression factor associated with schizophrenia. PANSS negative Marder factor score consists of 7 items and each item is rated on a scale from 1 (symptoms not present) to 7 (symptoms extremely severe). PANSS negative Marder factor score is the sum of 7 items and ranges from 7 to 49; where higher score indicating greater severity of symptoms.

Change From Baseline in Positive and Negative Syndrome Scale (PANSS) at Day 21: Disorganized Thought Marder Factor Score

PANSS subscales based on Marder factors assess negative symptoms, positive symptoms, disorganized thoughts factor, uncontrolled hostility/excitement factor, and anxiety/depression factor associated with schizophrenia. PANSS disorganized thought Marder factor score consists of 7 items and each item is rated on a scale from 1 (symptoms not present) to 7 (symptoms extremely severe). PANSS disorganized thought Marder factor score is the sum of 7 items and ranges from 7 to 49; where higher score indicating greater severity of symptoms.

Change From Baseline in Positive and Negative Syndrome Scale (PANSS) at Day 21: Hostility/Excitement Marder Factor Score

PANSS subscales based on Marder factors assess negative symptoms, positive symptoms, disorganized thoughts factor, uncontrolled hostility/excitement factor, and anxiety/depression factor associated with schizophrenia. PANSS hostility/excitement Marder factor score consists of 4 items and each item is rated on a scale from 1 (symptoms not present) to 7 (symptoms extremely severe). PANSS hostility/excitement Marder factor score is the sum of 4 items and ranges from 4 to 28; where higher score indicating greater severity of symptoms.

Change From Baseline in Positive and Negative Syndrome Scale (PANSS) at Day 21: Anxiety/Depression Marder Factor Score

PANSS subscales based on Marder factors assess negative symptoms, positive symptoms, disorganized thoughts factor, uncontrolled hostility/excitement factor, and anxiety/depression factor associated with schizophrenia. PANSS anxiety/depression Marder factor score consists of 4 items and each item is rated on a scale from 1 (symptoms not present) to 7 (symptoms extremely severe). PANSS anxiety/depression Marder factor score is the sum of 4 items and ranges from 4 to 28; where higher score indicating greater severity of symptoms.

Change From Baseline in Positive and Negative Syndrome Scale (PANSS) at Day 21: Derived Brief Psychiatric Rating Scale (BPRS) Core Psychosis Total Score

BPRS is a clinician-rated instrument for assessing conceptual disorganization, hallucinatory behavior, suspiciousness and unusual thought content associated with schizophrenia. The scale consists of 18 items. Each item is rated on a scale from 0 (symptom not present) to 6 (symptoms extremely severe). BPRS core psychosis total score is the sum of 18 items and ranges from 0 to 108; where higher score indicates greater severity of symptoms.

CGI-S is a 7-point clinician-rated scale for assessing the global severity of schizophrenia. Score range: 1 (normal - not ill at all) to 7 (most extreme illness). Higher score indicating greater degree of illness.

CGI-improvement is a 7-point clinician-rated scale for assessing the global improvement of schizophrenia ranging from 1 (very much improved) to 7 (very much worse). Higher score indicating less improvement.

Change From Baseline in Nurses' Observation Scale for Inpatient Evaluation (NOSIE-30) Subscale Scores at Day 21

NOSIE is an inpatient treatment staff-administered questionnaire. It consists of 30 items: 26 items divided into 6 subscales and 4 individual items. Each item is rated on a 5-point scale (0= never to 4= always), to assess functional ability of participants. 6 subscales: irritability (sum of 5 items: score range 0 to 20), manifest psychosis (sum of 4 items: score range 0 to 16), personal neatness (sum of 4 items: score range 0 to 16), retardation (sum of 3 items: score range 0 to 12), social competence (sum of 5 items: score range 0 to 20) and social interest (sum of 5 items: score range 0 to 20) and 4 individual items: cried (score range 0 to 4), refused to speak (score range 0 to 4), said felt blue or depressed (score range 0 to 4) and said he/she was no good (score range 0 to 4). For each of the 6 subscales and 4 individual items: higher scores indicates irregular functional ability.

GAF is a single clinician-rated item to measure the severity of illness-related impairment in psychological, social and occupational functioning. It is a 100 point rating scale, score range: 0= worst functioning to 99= superior functioning, where higher scores indicates better functioning.

Number of Participants With Treatment-Emergent Adverse Events (AEs) and Serious Adverse Events (SAEs)

An AE is any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. An SAE is 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 are events between first dose of study drug and up to 10 days after last dose that were absent before treatment or that worsened relative to pretreatment state. AEs included both serious and non-serious adverse events.

Criteria for vital signs of potential clinical concern: pulse rate (supine/sitting position) less than (<) 40 or greater than (>) 120 beats per minute (bpm), pulse rate in standing position <40 or >140 bpm; systolic blood pressure (SBP) <90 millimeters of mercury (mm Hg) and greater than or equal to (>=) 30 mm Hg change (increase, decrease) from baseline in same posture; diastolic blood pressure (DBP) <50 mm Hg and >=20 mm Hg change (increase, decrease) from baseline in same posture.

Number of Participants With Clinically Significant Physical and Neurological Examination Abnormalities

Analysis include general physical examination and assessment of head, ears, eyes, ocular fundi, nose, mouth, throat, neck, thyroid, lungs, heart, breasts, abdomen and musculoskeletal and neurological systems. Clinical significance was based on the investigator's discretion.

Criteria for ECG values for potential clinical concern: PR interval >=300 millisecond (msec), >=25 percent increase when baseline >200 msec, and >=50 percent increase when baseline less than or equal to (<=) 200 msec; QRS interval >=200 msec, >=25 percent increase when baseline >100 msec, and >=50 percent increase when baseline <=100 msec; QTcB interval (corrected QT interval using Bazett's formula) >=500 msec.

Criteria for laboratory abnormalities: Hemoglobin (Hgb), hematocrit, red blood cell (RBC) count: <0.8*lower limit of normal (LLN), platelet: <0.5*LLN or >1.75*upper limit of normal (ULN), white blood cell (WBC): <0.6*LLN or >1.5*ULN, lymphocyte, neutrophil: <0.8*LLN or >1.2*ULN, basophil, eosinophil, monocyte: >1.2*ULN; total bilirubin >1.5*ULN, aspartate aminotransferase, alanine aminotransferase, gamma-glutamyl transferase, alkaline phosphatase: > 3.0*ULN, total protein, albumin: <0.8*LLN or>1.2*ULN; blood urea nitrogen, creatinine: >1.3*ULN, uric acid >1.2*ULN; cholesterol (HDL <0.8*LLN, LDL >1.2*ULN); sodium <0.95*LLN or >1.05*ULN, potassium, chloride, calcium, magnesium, bicarbonate: <0.9*LLN or >1.1*ULN, phosphate <0.8*LLN or >1.2*ULN; prolactin >1.1*ULN; glucose <0.6*LLN or >1.5*ULN, glycosylated hemoglobin >1.3*ULN, creatine kinase >2.0*ULN; urine (pH <4.5 or >8, glucose, ketone, protein, blood/Hgb >=1, RBC, WBC >=6).

Number of Participants With Abnormal High Density Lipoprotein (HDL) and Low Density Lipoprotein (LDL) Level

Number of participants with abnormal values of HDL level <0.8* LLN and LDL level >1.2*ULN were reported.

Fasting glucose level below 6 micro international unit per milliliter (mcIU/mL) or above 27 mcIU/mL were considered as abnormal. Number of participants with abnormal values of fasting insulin level were reported.

ESRS-A is an instrument used to assess extrapyramidal symptoms (including tremor and dystonic reactions). It assesses 4 items: Parkinsonism, dystonia, dyskinesia, and akathisia. Each item is scored on a 5-point severity scale ranging from 0 to 4, with higher score indicating greater severity of symptoms.

SSS is a 7-point Likert scale which facilitates standardized observation of alertness and rates sleepiness, where 1= alert/wide awake, 2= able to concentrate, 3= not at full alertness, 4= not at peak and let down, 5= beginning to lose interest in remaining awake, 6= sleepiness, 7= sleep onset soon; lost struggle to remain awake. Score ranging from 1 to 7, where higher score indicates more sleepiness.

Clearance of a drug is a measure of the rate at which a drug is metabolized or eliminated by normal biological processes.

Hour 0 (pre-morning dose) on Day 7, 14, 21; 20 minutes post-dose on Day 7; 1.5, 4.5 hours post-dose on Day 14 and 24 hours post-dose on Day 21

AUC is a measure of the serum concentration of the drug over time. It is used to characterize drug absorption.

Hour 0 (pre-morning dose) on Day 7, 14, 21; 20 minutes post-dose on Day 7; 1.5, 4.5 hours post-dose on Day 14 and 24 hours post-dose on Day 21

Hour 0 (pre-morning dose) on Day 7, 14, 21; 20 minutes post-dose on Day 7; 1.5, 4.5 hours post-dose on Day 14 and 24 hours post-dose on Day 21

Inclusion Criteria: Have a current diagnosis of schizophrenia. Increase in symptoms over the past 2-4 weeks. Willing to remain inpatients for the duration of the trial. Exclusion Criteria: Evidence or history of clinically significant medical problems. Females of childbearing potential. A primary psychiatric diagnosis other than schizophrenia. A diagnosis of substance abuse or dependence in the last 6 months.

https://trialinfoemail.pfizer.com/pages/landing.aspx?StudyID=A8241006&StudyName=Double%20Blind%2C%20Randomized%2C%203%20Week%20Inpatient%20Study%20To%20Evaluate%20The%20Safety%20%26%20Efficacy%20Of%20PF-02545920%20Compared%20With%20Placebo