A Single-dose Study in Healthy Japanese Male Adults to Evaluate Pharmacokinetics and Pharmacodynamics of E5501 5 mg Tablet (Study E5501-J081-015)

Study Overview
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Brief Summary
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E5501 (5 mg, 20 mg, and 40 mg) will be administered to healthy male adults in a single-center, randomized, open-label, cross-over manner. This study will consist of 2 phases including pre-randomization (before drug administration) and postrandomization (after drug administration).

Official Title
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A Single-dose Study in Healthy Japanese Male Adults to Evaluate Pharmacokinetics and Pharmacodynamics of E5501 5 mg Tablet

Conditions
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Healthy

Intervention / Treatment
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* Drug: Group A: E5501 5mg, then 20mg, then 40 mg, then 5mg
* Drug: Group B: E5501 20mg, then 40mg, then 5 mg, then 5mg
* Drug: Group C: E5501 40mg, then 5mg, then 20 mg, then 5mg


Participation Criteria
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Eligibility Criteria
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Inclusion criteria; Non-smokers aged 20-44 at the time of informed consent, BMI is between 18.5 kg/m2 and below 25 kg/m2 at screening, Platelet count is between 120,000/ microliter and below 300,000/ microliter at screening and baseline Subjects and their partners can agree to use medically appropriate contraception through the study period Voluntarily provided written informed consent Willing and able to comply with the protocol Exclusion criteria; With a past or present history of arterial thrombosis, venous thrombosis or thrombophilia With a past history of clinically significant disease within 8 weeks before study drug administration or clinically significant infection within 4 weeks before study drug administration With a past surgical history that may affect the pharmacokinetics of E5501 Suspected to have a clinically abnormal symptom or organ dysfunction that requires treatment based on the past history, complications, subjective and objective symptoms, vital signs and body weight, electrocardiograms or clinical laboratory results at screening or baseline QTcF greater than 450 ms (corrected for heart rate according to Fridericia's formula) category of the 12-lead electrocardiogram at screening or baseline

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 44 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Group A<br>E5501 5mg, then 20mg, then 40 mg, then 5mg | Drug: Group A: E5501 5mg, then 20mg, then 40 mg, then 5mg<br>* The post-randomization phase consists of the Treatment Period 1 (Visits 2-8): participants received one 5 mg tablet under fed conditions on treatment morning for 28 days. Treatment Period II (visits 9-15): 20 mg (four 5 mg tablets) under fed conditions on treatment morning for 28 days. Treatment Period III (visits 16-22): 40 mg (eight 5 mg tablets) under fed conditions on treatment morning for 28 days. Treatment Period IV (visits 23-29): 5 mg tablet on treatment morning under fasted conditions for 28 days. The washout period of 27 days or longer was set between the administration of the study drug in Treatment Periods 1, 2 and 3 and that in Treatment Periods 2, 3 and 4 respectively.<br>|
| Experimental: Group B<br>E5501 20mg, then 40mg, then 5 mg, then 5mg | Drug: Group B: E5501 20mg, then 40mg, then 5 mg, then 5mg<br>* The post-randomization phase consists of the Treatment Period 1 (Visits 2-8): participants received 20 mg (four 5 mg tablets) under fed conditions on treatment morning for 28 days. Treatment Period II (visits 9-15): 40 mg (eight 5 mg tablets) under fed conditions on treatment morning for 28 days. Treatment Period III (visits 16-22): one 5 mg tablet under fed conditions on treatment morning for 28 days. Treatment Period IV (visits 23-29): 5 mg tablet on treatment morning under fasted conditions for 28 days. The washout period of 27 days or longer was set between the administration of the study drug in Treatment Periods 1, 2 and 3 and that in Treatment Periods 2, 3 and 4 respectively.<br>|
| Experimental: Group C<br>E5501 40mg, then 5mg, then 20 mg, then 5mg | Drug: Group C: E5501 40mg, then 5mg, then 20 mg, then 5mg<br>* The post-randomization phase consists of the Treatment Period 1 (Visits 2-8): participants received 40 mg (eight 5 mg tablets) under fed conditions on treatment morning for 28 days. Treatment Period II (visits 9-15): one 5 mg tablet under fed conditions on treatment morning for 28 days. Treatment Period III (visits 16-22): 20 mg (four 5 mg tablets) under fed conditions on treatment morning for 28 days. Treatment Period IV (visits 23-29): 5 mg tablet on treatment morning under fasted conditions for 28 days. The washout period of 27 days or longer was set between the administration of the study drug in Treatment Periods 1, 2 and 3 and that in Treatment Periods 2, 3 and 4 respectively.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Pharmacokinetic Parameter: Maximal Drug Concentration (Cmax) Under Fed Conditions |  | 0, 1, 2, 3, 4, 5, 6, 7, 8, 12, 24, 36, 48, 72, 96 hours post-dose | 
| Pharmacokinetic Parameter: Area Under the Curve From Time Zero to Last Quantifiable Concentration [AUC (0-t)] Under Fed Conditions | AUC (0-t)= Area under the plasma concentration versus time curve from time zero (pre-dose) to time of last quantifiable concentration (0-t) | 0, 1, 2, 3, 4, 5, 6, 7, 8, 12, 24, 36, 48, 72, 96 hours post-dose | 
| Pharmacokinetic Parameter: Area Under the Curve From Time Zero to Extrapolated Infinite Time [AUC (0 - infinity)] Under Fed Conditions | AUC (0 - infinity)= Area under the plasma concentration versus time curve (AUC) from time zero (pre-dose) to extrapolated infinite time (0 - infinity). It is obtained from AUC (0 - t) plus AUC (t - infinity). | 0, 1, 2, 3, 4, 5, 6, 7, 8, 12, 24, 36, 48, 72, 96 hours post-dose | 
| Pharmacokinetic Parameter: Time to Reach Maximum Observed Plasma Concentration (Tmax) Under Fed Conditions |  | 0, 1, 2, 3, 4, 5, 6, 7, 8, 12, 24, 36, 48, 72, 96 hours post-dose | 
| Pharmacokinetic Parameter: Plasma Decay Half-Life (t1/2) Under Fed Conditions | Plasma decay half-life is the time measured for the plasma concentration to decrease by one half. | 0, 1, 2, 3, 4, 5, 6, 7, 8, 12, 24, 36, 48, 72, 96 hours post-dose |