Evaluation Of The Efficacy And Safety Of Single Doses Of PF-05089771 In Patients With Primary (Inherited) Erythromelalgia

Phase 2

Completed

Conditions: Inherited Erythromelalgia

Interventions: Drug: Placebo
Drug: PF-05089771

Registration Number: NCT01769274

Lead Sponsor: Pfizer

Brief Summary: The purpose of this study is to evaluate the efficacy and safety of single doses of PF-05089771 against placebo in treatment of pain in patients with primary, inherited erythromelalgia.

Detailed Description: Not available

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 5

Inclusion Criteria

Male and or female subjects between the ages of 18-78 years
Subject has clinical signs of IEM
Minimum BMI 17.5kg/m2 and total body weight >50kg

Exclusion Criteria

Other severe pain conditions, e.g. rheumatologic, that may impair subject's self-assessment of pain due to IEM.
Evidence of clinically significant hypertension, clinically significant hematological, dermatological, renal, endocrine (except diabetes mellitus), pulmonary, gastrointestinal, cardiovascular, hepatic, neurological (other than IEM), or allergic disease (including drug allergies but excluding untreated asymptomatic seasonal allergies).
Subjects with severe obesity.

Study & Design

Study Type: INTERVENTIONAL

Study Design: CROSSOVER

Arm && Interventions

Group	Intervention	Description
Placebo comparator: matching placebo	Placebo	Single oral dose of placebo for PF-05089771 1600 mg
PF-05089771 1600 mg	PF-05089771	-

Primary Outcome Measures

Name	Time	Method
Average Pain Intensity Numerical Rating Scale (PI-NRS) Score - From 0 to 4 Hours Post-dose	Every 15 minutes from 0 to 4 hours post-dose	Participants rated severity of their pain at 11 point PI-NRS, by choosing a number between 0 and 10, where 0= no pain and 10= worst possible pain; higher scores signify more pain. The average pain score was calculated as the mean of the pain scores recorded every 15 minutes from 0 to 4 hours post-dose.

Secondary Outcome Measures

Name	Time	Method
Area Under the Plasma Concentration-Time Curve From Time Zero to the 24 Hour Post-dose (AUC24) of PF-05089771	Predose, 0.5, 2, 4, 6, and 24 hours post-dose
Area Under the Curve From Time Zero to Last Quantifiable Concentration (AUClast) of PF-05089771	Predose and 0.5, 2, 4, 6, and 24 hours post dose
Maximum Observed Plasma Concentration (Cmax) of PF-05089771	Predose and 0.5, 2, 4, 6, and 24 hours post dose
Time to Reach Maximum Observed Plasma Concentration (Tmax) of PF-05089771	Predose and 0.5, 2, 4, 6, and 24 hours post dose
Number of Participants With Treatment Emergent Adverse Events (AEs) and Serious Adverse Events (SAEs)	Baseline up to a maximum of Day 83	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. A treatment emergent AE was defined as an event that emerged during the treatment period that was absent before treatment, or worsened during the treatment period relative to the pretreatment state.
Number of Participants With Laboratory Abnormalities	Baseline up to a maximum of Day 73	Laboratory abnormalities: Hemoglobin (Hgb), hematocrit, red blood cell count: less than(\<)0.8\lower limit of normal(LLN), platelet: \<0.5\LLN/greater than (\>)1.75\upper limit of normal (ULN), white blood cell: \<0.6\LLN/\>1.5\ULN, lymphocyte, neutrophil (absolute, %):\<0.8\LLN/\>1.2\ULN, total neutrophil \<0.8\LLN;basophil, eosinophil, monocyte (absolute, %):\>1.2\ULN; mean corpuscular (MC) volume, mean cell hemoglobin, MC hemoglobin concentration, mean platelet volume: \<0.9\LLN/\>1.1\ULN; total bilirubin \>1.5\ULN, aspartate aminotransferase (AT), alanine AT, gammaglutamyl transferase, alkaline phosphatase:\> 3.0\ULN, total protein, albumin: \<0.8\LLN/\>1.2\ULN; blood urea nitrogen, creatinine:\>1.3\ULN, uric acid \>1.2\ULN; sodium \<0.95\LLN/\>1.05\ULN, potassium, chloride, calcium, magnesium, bicarbonate: \<0.9\LLN/\>1.1\ULN; glucose \<0.6\LLN/\>1.5\*ULN; urine (specific gravity \<1.003/\>1.030, pH \<4.5/\>8, glucose, ketone, protein, blood/Hgb, urobilinogen, bilirubin, nitrite, leukocyte esterase \>=1).
Number of Participants With Clinically Significant Changes From Baseline in Core Body Temperature	Baseline up to a maximum of Day 83	The minimum starting temperature to measure core body temperature used was 33 degree Celsius. Clinically significant changes from baseline in core body temperature was judged by investigator.
Number of Participants With Clinically Significant Changes From Baseline in Blood Pressure	Baseline up to a maximum of Day 83	Criteria for clinically significant blood pressure abnormalities: systolic blood pressure \>=30 millimetre of Mercury (mmHg) change from baseline in same posture, systolic blood pressure \<90 mmHg, diastolic blood pressure \>=20 mmHg change from baseline in same posture, diastolic blood pressure \<50 mmHg.
Number of Participants With Clinically Significant Changes From Baseline in Electrocardiogram (ECG)	Baseline up to a maximum of Day 83	Criteria for clinically significant abnormalities in ECG : PR interval \>=300 millisecond (msec) and 25 percent (%) increase when baseline \>200 msec, 50% increase when baseline less than or equal to (\<=) 200 msec; QRS interval \>=140 msec, \>=50% increase from baseline; QT interval \>=500 msec; QT interval corrected using the Fridericia formula (QTcF) 450 msec to \<480 msec, \>=480 msec, 30 to \<60 msec increase from baseline, \>=60 msec increase from baseline.
Average PI-NRS Score - From Post Evoked Pain Time Point 2 (EP2) to 8 Hours Post-dose	Post EP2, every 5 minutes for the first hour, then every 15 minutes up to 8 hours post-dose	Participants rated severity of their pain at 11 point PI-NRS, by choosing a number between 0 and 10. Where 0= no pain and 10= worst possible pain; higher scores signify more pain. Evoked pain time point 2= first time point post-dose when pain was evoked using the participant specific heat pain stimulus. EP2 is approximately a time point 4-5 hours post-dose. The average pain score was calculated as the mean of the pain scores recorded from EP2 to 8 hours post-dose.
Average PI-NRS Scores - From Post Evoked Pain Time Point 3 (EP3) to 10 Hours Post-dose	Post EP3, every 5 minutes for the first hour, then every 15 minutes up to 10 hours post-dose	Participants rated severity of their pain at 11 point PI-NRS, by choosing a number between 0 and 10. Where 0= no pain and 10= worst possible pain; higher scores signify more pain. Evoked pain time point 3= second time point post-dose when pain was evoked using the participant specific heat pain stimulus. EP3 is approximately a time point 8-9 hours post-dose. The average pain score was calculated as the mean of the pain scores recorded from EP3 to 10 hours post-dose.
Average PI-NRS Scores - From Post Evoked Pain Time Point 4 (EP4) to 28 Hours Post-dose	Post EP4, every 5 minutes for the first hour, then every 15 minutes up to 28 hours post-dose	Participants rated severity of their pain at 11 point PI-NRS, by choosing a number between 0 and 10. Where 0= no pain and 10= worst possible pain; higher scores signify more pain. Evoked pain time point 4= third time point post-dose when pain was evoked using the participant specific heat pain stimulus. EP4 is approximately a time point 24-25 hours post-dose. The average pain score was calculated as the mean of the pain scores recorded from EP4 to 28 hours post-dose.
Maximum PI-NRS Scores - From 0 Hour to 4 Hours Post-dose	From 0 hour to 4 hours post-dose	Participants rated severity of their pain at 11 point PI-NRS, by choosing a number between 0 and 10. Where 0= no pain and 10= worst possible pain; higher scores signify more pain. Maximum pain score in 4 hours period post-dosing is reported.
Maximum PI-NRS Scores - From Post EP2 to 8 Hours Post-dose	From post EP2 to 8 hours post-dose	Participants rated severity of their pain at 11 point PI-NRS, by choosing a number between 0 and 10. Where 0= no pain and 10= worst possible pain; higher scores signify more pain. Evoked pain time point 2= first time point post-dose when pain was evoked using the participant specific heat pain stimulus. EP2 is approximately a time point 4-5 hours post-dose. Maximum pain score in period from post EP2 to 8 hours post-dose is reported.
Maximum PI-NRS Scores - From Post EP3 to 10 Hours Post-dose	From the end of EP3 to 10 hours post dose	Participants rated severity of their pain at 11 point PI-NRS, by choosing a number between 0 and 10. Where 0= no pain and 10= worst possible pain; higher scores signify more pain. Evoked pain time point 3= second time point post-dose when pain was evoked using the participant specific heat pain stimulus. EP3 is approximately a time point 8-9 hours post-dose. Maximum pain score in period from post EP3 to 10 hours post-dose is reported.
Maximum PI-NRS Scores - From Post EP4 to 28 Hours Post-dose	Post EP4, every 5 minutes for the first hour, then every 15 minutes up to 28 hours post-dose	Participants rated severity of their pain at 11 point PI-NRS, by choosing a number between 0 and 10. Where 0= no pain and 10= worst possible pain; higher scores signify more pain. Evoked pain time point 4= third time point post-dose when pain was evoked using the participant specific heat pain stimulus. EP4 is approximately a time point 24-25 hours post-dose. Maximum pain score in period from post EP4 to 28 hours post-dose is reported.
Duration When PI-NRS Scores Were Greater Than (>) 5 - From 0 Hour to 4 Hours Post-dose	From 0 hour to 4 hours post-dose	Participants rated severity of their pain at 11 point PI-NRS, by choosing a number between 0 and 10. Where 0= no pain and 10= worst possible pain; higher scores signify more pain. The duration of time that participants experienced PI-NRS score greater than 5 from the 0 hours to 4 hours post-dose.
Duration When PI-NRS Scores Were >5 - From Post EP2 to 8 Hours Post-dose	Post EP2, every 5 minutes for the first hour, then every 15 minutes up to 8 hours post-dose	Participants rated severity of their pain at 11 point PI-NRS, by choosing a number between 0 and 10. Where 0= no pain and 10= worst possible pain; higher scores signify more pain. Evoked pain time point 2= first time point post-dose when pain was evoked using the participant specific heat pain stimulus. EP2 is approximately a time point 4-5 hours post-dose. The duration of time that participants experienced PI-NRS score \>5 from in period from post EP2 to 8 hours post-dose is reported.
Duration When PI-NRS Scores Were >5 - From Post EP3 to 10 Hours Post-dose	Post EP3, every 5 minutes for the first hour, then every 15 minutes up to 10 hours post-dose	Participants rated severity of their pain at 11 point PI-NRS, by choosing a number between 0 and 10. Where 0= no pain and 10= worst possible pain; higher scores signify more pain. Evoked pain time point 3= second time point post-dose when pain was evoked using the participant specific heat pain stimulus. EP3 is approximately a time point 8-9 hours post-dose. The duration of time that participants experienced PI-NRS score \>5 from the post EP3 to 10 hours post dose.
Duration When PI-NRS Scores Were >5 - From Post EP4 to 28 Hours Post-dose	After EP4, every 5 minutes for the first hour, then every 15 minutes up to 28 hours post-dose	Participants rated severity of their pain at 11 point PI-NRS, by choosing a number between 0 and 10. Where 0= no pain and 10= worst possible pain; higher scores signify more pain. Evoked pain time point 4= third time point post-dose when pain was evoked using the participant specific heat pain stimulus. EP4 is approximately a time point 24-25 hours post-dose. The duration of time that participants experienced PI-NRS score \>5 from post EP4 to 28 hours post-dose.
Number of Participants With Participant's Global Satisfaction Score	At 4 hour post-dose or at time of first rescue therapy, whichever occurred first	Participant was asked "How would you rate the study medication you received for pain?". The participant was provided the following choices as an answer: excellent=4; good=3; fair=2; poor=1. Response to this question, was participant's overall impression (global evaluation) of the study medication at 4 hour post-dose or at time of first rescue treatment or medication, which ever occurred first.
Time to First Use of Rescue Therapy or Medication	Up to maximum of 24 hours post-dose	Time to rescue medication (hour) was calculated as: date/time of rescue medication minus date/time of first dose for each period. If participant who did not receive rescue medication, the time of censoring was cut off at 24 hours or the time of withdrawal, whichever was earlier. Kaplan-Meier method was used for estimation.