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Exploratory THS 2.1 Biomarkers of Exposure Study (ZRHX-EX-01)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT01780714
Recruitment Status : Completed
First Posted : January 31, 2013
Last Update Posted : November 20, 2019
Information provided by (Responsible Party):
Philip Morris Products S.A.

Brief Summary:
The goal of this exploratory study is to evaluate the effect of a candidate modified risk tobacco product (MRTP), THS 2.1, on selected biomarkers of exposure to harmful and potentially harmful smoke constituents (HPHCs), compared to conventional cigarettes (CC). The subjective effects (urge to smoke and withdrawal symptoms) which are related to the use of this product will be explored. Initial information on safety and on some biological effects when using THS 2.1 will be collected. Human Smoking Topography (HST) will be explored.

Condition or disease Intervention/treatment Phase
Smoking Other: Conventional cigarettes (CC) Other: THS 2.1 Not Applicable

Detailed Description:

This study intends to evaluate the levels of selected biomarkers of exposure to selected HPHC and of cytochrome P450 1A2 (CYP1A2) enzymatic activity, as compared to smokers continuing smoking CC ad libitum, after 5 days of ad libitum use.

Additional parameters will be explored, such as: cytochrome P450 2A6 (CYP2A6) enzymatic activity, nicotine pharmacokinetics, product evaluation and safety, marker of platelet function, and HST.

After screening, subjects will be admitted to the clinic for 9 days, including the Day of Admission, 2 days of baseline during which all subjects will continue to smoke their usual CC for a 5-day exposure after randomization. After leaving the clinic on the Day of Discharge, the subjects will be followed up for safety over a period of 7 days. All subjects will receive smoking cessation advice at screening, at Day of Admission and at Day of Discharge.

This clinical study will be conducted in compliance with International Conference on Harmonisation of technical requirements for registration of pharmaceuticals for human use (ICH Good Clinical Practice), the Declaration of Helsinki as amended in 2008, and the applicable regulatory requirements.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 42 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Other
Official Title: A Single-center, Open-label, Randomized, Controlled, 2-arm Parallel Group Study to Evaluate the Exposure to Selected Smoke Constituents in Smoking, But Otherwise Healthy Subjects Switching From Conventional Cigarettes to the Tobacco Heating System (THS) 2.1
Study Start Date : June 2012
Actual Primary Completion Date : July 2012
Actual Study Completion Date : December 2012

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Smoking

Arm Intervention/treatment
Active Comparator: Conventional cigarettes (CC)
Smokers are continuing to smoke exclusively their usual own brand of CC, for 5 days, ad libitum, under highly controlled conditions
Other: Conventional cigarettes (CC)
Subjects are randomized in a 1:1 fashion to be assigned either A) continuing CC, or B) switching to THS 2.1

Experimental: Tobacco Heating System 2.1 (THS 2.1)
Smokers are switching to the exclusive and ad-libitum use of THS 2.1 for 5 days, under highly controlled conditions
Other: THS 2.1
Subjects are randomized in a 1:1 fashion to be assigned either A) continuing CC, or B) switching to THS 2.1

Primary Outcome Measures :
  1. Evaluation of carboxyhemoglobin (COHb) levels in blood, and evaluation of excretion of 3-hydroxypropyl mercapturic acid (3-HPMA), monohydroxybutenyl mercapturic acid (MHBMA), and S-phenyl mercapturic acid (S-PMA) in 24-hour urine on switching to THS 2.1 [ Time Frame: 5 days ]
    Biomarkers of exposure to carbon monoxide (CO), acrolein, 1,3-butadiene, and benzene

Secondary Outcome Measures :
  1. Selected secondary biomarkers of exposure to HPHCs [ Time Frame: 5 days ]
    Evaluation of the levels of total 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (total NNAL),1-hydroxypyrene , total N-nitrosonornicotine (NNN), 4-aminobiphenyl (4-ABP), 2- aminonaphthalene (2-NA), o-toluidine, nicotine equivalents and 2-cyanoethylmercapturic acid, biomarkers of exposure to the HPHCs 4-(methylnitrosamino)-1- (3-pyridyl)-1-butanone, NNN, 4-ABP, 2-NA, o-toluidine, nicotine and acrylonitrile, respectively, as excreted in urine.

  2. CYP1A2 activity and CYP2A6 activity [ Time Frame: 5 days ]
    Evaluation of the CYP1A2 activity, as measured by the plasma caffeine molar metabolic ratio (paraxanthine / caffeine) and in CYP2A6 activity, as measured by nicotine molar metabolic ratio (3-hydroxy-cotinine / cotinine) in plasma and in urine

  3. Plasma nicotine [ Time Frame: 5 days ]
    Time course of nicotine plasma concentrations and derived pharmacokinetic parameters

  4. 11-dehydro-thromboxane B2 (11-DTX-B2) [ Time Frame: 5 days ]
    To describe the 11-DTX-B2 levels in urine as a marker of platelet function

  5. Product use and smoking topography [ Time Frame: Up to 5 days ]
    Monitoring of daily product use and human smoking topography

  6. Safety monitoring [ Time Frame: 8 days + 7 days follow-up ]
    Monitoring of adverse events, based on clinical and laboratory evaluation

  7. Cough Visual Analog Scale (Cough VAS) [ Time Frame: 7 days ]
    Visual Analog Scale on cough

  8. Modified Cigarette Evaluation Questionnaire (MCEQ) [ Time Frame: 5 days ]
    MCEQ measuring subjective effects of smoking

  9. Questionnaire on Smoking Urges (brief version) (QSU-brief) [ Time Frame: 5 days ]
    QSU-brief measuring subjective effects of smoking

  10. Minnesota Withdrawal Scale-Revised (MNSWS-R) [ Time Frame: 5 days ]
    MNWS-R questionnaire measuring subjective effects of smoking

Information from the National Library of Medicine

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Ages Eligible for Study:   23 Years to 65 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Subject has signed an informed consent form before commencement of study procedures
  • Healthy Caucasian aged between 23 to 65 years
  • Subject is a current smoker for at least 3 years (based on self-reporting and biochemically verified), who, for the last 4 weeks, had smoked at least 10 commercially available non-mentholated CC per day, and is not planning to make a quit attempt within the next 3 months

Main Exclusion Criteria:

  • As per Investigator judgment, the subject should not participate in the study for any reason (e.g. medical, psychiatric and/or social reason)
  • The subject has a medical condition requiring smoking cessation, or has a clinically relevant disease / condition which could interfere with the study participation and/or study results
  • The subject has participated in a clinical study within 3 months prior to the Screening Visit
  • Pregnant or lactating woman, and for woman of childbearing potential, absence / refusal to use an acceptable method of effective contraception

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): NCT01780714

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MTZ Clinical Research Sp. z o.o.
Warsaw, Poland, 02-106
Sponsors and Collaborators
Philip Morris Products S.A.
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Principal Investigator: Katarzyna Jarus-Dziedzic, MD PhD MTZ Clinical Research Sp. z o.o., Warsaw, Poland
Publications of Results:
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Responsible Party: Philip Morris Products S.A.
ClinicalTrials.gov Identifier: NCT01780714    
Other Study ID Numbers: ZRHX-EX-01
First Posted: January 31, 2013    Key Record Dates
Last Update Posted: November 20, 2019
Last Verified: November 2019
Keywords provided by Philip Morris Products S.A.:
human smoking topography (HST)
modified risk tobacco product (MRTP)
THS 2.1