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Study To Evaluate Pharmacokinetics Of Sirolimus In Stable Renal Transplant Recipients

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ClinicalTrials.gov Identifier: NCT01236378
Recruitment Status : Completed
First Posted : November 8, 2010
Results First Posted : February 29, 2012
Last Update Posted : March 1, 2012
Sponsor:
Information provided by (Responsible Party):
Pfizer

Brief Summary:

Sirolimus, 1 mg, white, triangular tablets (Rapamune®) was approved on 03 April 2007 in China for prophylaxis of organ rejection in renal transplantation. A pharmacokinetic (PK) study to be conducted in renal allograft recipients was requested by State Food and Drug Administration (SFDA) to provide further guidance for clinical use.

To minimize risk to patients, this study is designed to collect blood PK samples from renal allograft recipients who are currently under sirolimus (1 mg tablets) treatment with or without concomitant medication(s). PK samples will be collected from these patients to characterize the steady state PK of sirolimus during sirolimus maintenance therapy. This study will not involve any changes to the established treatment regimen for the patients who enroll in the study


Condition or disease Intervention/treatment Phase
Transplant Rejection Renal Transplantation Drug: Sirolimus Phase 1

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 24 participants
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: An Open-Label, Non-Randomized Study To Evaluate The Steady-State Pharmacokinetics Of Sirolimus Tablets In Chinese Patients With Stable Renal Allografts
Study Start Date : December 2010
Actual Primary Completion Date : April 2011
Actual Study Completion Date : April 2011

Resource links provided by the National Library of Medicine

Drug Information available for: Sirolimus

Arm Intervention/treatment
Experimental: sirolimus
Subjects must be taking sirolimus (1 mg tablet formulation) with or without concomitant medications, unless specifically excluded below, for prophylaxis of renal rejection.
Drug: Sirolimus
Sirolimus, 1 mg, white, triangular tablets, daily dose, dosages of any of these medications must be stable for at least 2 weeks prior to screening and continue with no change until completion of the last PK sample collection.
Other Name: Rapamune




Primary Outcome Measures :
  1. Maximum Observed Blood Concentration at Steady State (Cmax,ss) [ Time Frame: Predose (0 hour) and 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 12 and 24 hours post dose ]
  2. Time to Reach Maximum Observed Blood Concentration at Steady State (Tmax,ss) [ Time Frame: Predose (0 hour) and 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 12 and 24 hours post dose ]
  3. Observed Blood Trough Concentration at Steady State (Ctrough,ss) [ Time Frame: Predose (0 hour) and 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 12 and 24 hours post dose ]
  4. Average Blood Concentration at Steady State (Cave,ss) [ Time Frame: Predose (0 hour) and 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 12 and 24 hours post dose ]
  5. Area Under the Curve From Time Zero to End of Dosing Interval (AUCtau) at Steady State [ Time Frame: Predose (0 hour) and 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 12 and 24 hours post dose ]
  6. Degree of Fluctuation (DF) [ Time Frame: Predose (0 hour) and 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 12 and 24 hours post dose ]
    DF, also known as peak to trough fluctuation (PTF) (calculated as [Cmax minus Ctrough] divided by Cave), is a unit-less ratio of the Cmax to Ctrough decrease expressed as a fraction of the average concentration during a dosing interval.

  7. Apparent Oral Clearance (CL/F) [ Time Frame: Predose (0 hour) and 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 8, 12 and 24 hours post dose ]
    Clearance of a drug is a measure of the rate at which a drug is metabolized or eliminated by normal biological processes. Clearance obtained after oral dose (apparent oral clearance) is influenced by the fraction of the dose absorbed. Clearance was estimated from population pharmacokinetic (PK) modeling. Drug clearance is a quantitative measure of the rate at which a drug substance is removed from the blood. Clearance obtained after oral dose (apparent oral clearance) is influenced by the fraction of the dose absorbed.


Secondary Outcome Measures :
  1. Number of Participants With Serum Creatinine Levels More Than (>) 1.3 Times the Upper Limit of Normal [ Time Frame: From baseline up to Day 4 ]
    Serum creatinine, an indicator of kidney function, formed from the metabolism of creatine, commonly found in blood, urine, and muscle tissue, is removed from blood by kidneys and excreted in urine. Increased creatinine in blood indicates decreased kidney function. Creatinine levels are age, gender and race dependent as they are related to an individual's muscle mass. Renal transplant recipients may have elevated serum creatinine. For this study an abnormal serum creatinine level is defined as 1.3 times the upper limit of normal (ULN) for the laboratory where the determination was performed.

  2. Number of Participants With Estimated Glomerular Filtration Rate (GFR) Less Than (<) 60 mL/Min/1.73 m^2 [ Time Frame: From baseline up to Day 4 ]
    GFR, an index of kidney function, describes flow rate of filtered fluid through the kidney. GFR can be measured directly or estimated using established formulas. GFR was calculated using the Simplified Modification of Diet in Renal Dysfunction (MDRD) GFR equation. Normal GFR is >90 mL/min/1.73 m^2; children and older people usually have lower GFR. Often, kidney transplant recipients do not have normal GFRs. Lower values indicate poor kidney function. GFR <15 mL/min/1.73 m^2 is consistent with kidney failure. For this posting, the number of subjects with a GFR <60 mL/min/1.73 m^2 is listed.



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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • Male or female, above 18 years of age and Body Mass Index (BMI) of 18.0 to 25.0 kg/m2, inclusive;
  • Subjects must have received a primary or secondary renal allograft for at least 2 months prior to Screening;
  • Subjects must be currently taking Rapamune tablets for prophylaxis of renal rejection. The dosages of any medications must be stable for at least 2 weeks prior to screening and continue with no change until completion of the last PK sample collection.

Exclusion Criteria:

  • Acute rejection or vascular rejection episode in the 4 weeks prior to Screening; or patients dependent on dialysis; or inadequate renal function (in the opinion of the investigator);
  • Recipients of multiple organ transplants (i.e., prior or concurrent transplantation of any organs other than renal transplant);
  • Current use of strong inducers or inhibitors of CYP3A4 within 2 weeks prior to collection of the first PK sample and until collection of the final PK sample;
  • Any clinically significant medical or psychiatric condition or laboratory abnormality, in the judgment of the investigator.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01236378


Locations
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China
Pfizer Investigational Site
Chongqing, China, 400038
Pfizer Investigational Site
Shanghai, China, 200127
Sponsors and Collaborators
Pfizer
Investigators
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Study Director: Pfizer CT.gov Call Center Pfizer

Additional Information:
Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
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Responsible Party: Pfizer
ClinicalTrials.gov Identifier: NCT01236378     History of Changes
Other Study ID Numbers: B1741018
First Posted: November 8, 2010    Key Record Dates
Results First Posted: February 29, 2012
Last Update Posted: March 1, 2012
Last Verified: April 2011

Keywords provided by Pfizer:
Organ Transplants
Anti-Rejection Therapy
Pharmacokinetics

Additional relevant MeSH terms:
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Sirolimus
Everolimus
Anti-Bacterial Agents
Anti-Infective Agents
Antibiotics, Antineoplastic
Antineoplastic Agents
Antifungal Agents
Immunosuppressive Agents
Immunologic Factors
Physiological Effects of Drugs