clinical trials - phase 1. what are phase i trials ? phase i trials refer to the first introduction...
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Clinical Trials - PHASE 1
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WHAT ARE PHASE I TRIALS ?
Phase I trials refer to the first introduction of an experimental drug into the human population.
Subjects are usually healthy male adult volunteers.
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WHY PHASE I TRIALS?
The primary concern - assessment of the drug’s safety and safe effective dose for further phase studies
To determine what happens to the drugs in the human body.
To determine the dosage level of the drug.
To evaluate how a new drug should be administered.
Side effects of the drug.
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Problems Most problems associated with this
phase are related to the direct pharmacodynamic effect, i.e inter species differences.
E.g. Penicillin oral produces toxic GI bleed in Guinea pigs but it is well tolerated in man.
There are certain types of drug activities which are seen only in man.
E.g. changes in mood, arousal, sleep etc.
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PRE-CLINICAL DATA
Pre-clinical evaluation gives us information on:
The approximate starting dose for Phase I human trials.
Parameters for potential adverse effects.
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DOSE IN PHASE I
NOEL No Observed Effect Level NOAEL No Observed Adverse Effect
Level MRSD Maximum Recommended Starting
Dose MRDD Maximum Recommended Daily
Dose
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INITIAL HUMAN DOSEA starting dose can be selected low enough to avoid unnecessary risk.
Generally, first dose can be related to ED50 in pre clinical studies.
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STUDY SITE
Should have a well equipped Clinical Pharmacology Unit.
Be able to conduct tests such as that of blood/plasma etc.
Medical experts should be around. Should be well equipped to handle
emergencies or any such eventualities.
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REGULATORY ASPECTS
Under the directives of the Drugs and Cosmetics Rules, phase I trials are not normally permitted for foreign companies and is usually reserved for the new drug substance discover in India.
The 2005 amendment of the Schedule-Y of the Drugs and Cosmetics Rules made parallel trials possible in India.
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DRUGS UNDERGOING PHASE I TRIALS AT PRESENT ARE: Praneem, a neem based poly-herbal
microbicide being developed by Pune based NARI is in the phase I stage.
HIV Vaccine (tgAAC09) is now undergoing phase I trials for safety and immunogenicity assessment in healthy HIV uninfected volunteers at NARI, Pune.
Gropep is presently carrying out a phase I trial of its infertility drug- PV903
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STUDY TEAM DESIGN
The team designing a clinical study must possess a comprehensive understanding of
Medical consideration Regulatory requirements
Therefore, involvement of regulatory affairs group is important and fundamental to the principles of good clinical project management.
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EXPERIMENTAL DESIGN
Phase I studies are carried out in 2 stages
Single rising doseRepeat
administration
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STAGE 1–SINGLE RISING DOSE
Each volunteer given a single dose of drug/placebo.
Dose-escalating study design. Initial dose and route of administration
decided from existing pre-clinical data. 8 -12 volunteers admitted after
meticulous screening. 2-4 volunteers receive placebo and 6-8
volunteers receive drug under study.
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STAGE 1-SINGLE RISING DOSE Study subjects admitted in an inpatient
clinic, observed by full time medical staff.
Test and examination done:Prior to start of drug administration At interval during the study (e.g. 2h, 4h,
8h, 16h )Before discharge4-10 hrs after dose.
Only after results of 1st group analyzed, drug administered to the next group.
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STAGE 2 REPEATED ADMINISTRATION
Start after single dose administration results assessed.
Drug / placebo given repeatedly for 1 or more weeks
E. g. Antibiotics given for 5-7 daysAnticonvulsants tested for 4 weeks or
more Interval between doses is usually one
half life.
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STAGE 2 REPEATED ADMINISTRATION (contd.)
Study design - Typically dose escalating studies
Kinetic data obtained from blood and urine sample collected after 1st and last dose
‘Trough samples’ – blood sample taken immediately prior drug administration give information about accumulation and attainment of steady state blood concentration
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Requirements
All documents of pre-clinical data Plans, protocols and CRF ’s for phase I
studies. Name, address and bio-data of investigator. Agreement from the sponsors to inform the
drug controller of any AR’s occurring during ongoing animal/human studies.
Nature of ‘informed consent’ Agreement to submit annual progress report
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FEES
Regulatory fees payable to the DCGI’ s office for reviewing submitted documents.
Rs. 50,000/- for phase I studies. Application to be submitted to the
Drugs Controller General (India) office at Nirman Bhavan.
Fees to be paid in a Nationalized bank in government account.
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Study Subjects
Healthy adult volunteers or patients
Moderately ill patients likely to benefit from the drug, can volunteer
Small number - 20 to 80
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DOSE INCREMENT
First 3-4 patients based on on-going experience in tolerability.
Increase can be 1.5 or 2 times the previous dose depending on -
Pharmacodynamic effects of the previous dose.
Margin between projected therapeutic dose.
Theoretical max human tolerated dose.
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ADVERSE EFFECTS
Appearance of a SAE major challenge in new drug testing.
If investigational drug responsible for AE, subsequent administration to be prevented.
Significant AE-subject withdrawn from further dosing.
Assessment of data and expert consultation done to decide-role of drug in AE and study continuation.
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ADVERSE DRUG REACTIONS
Serious toxicity is rare and needs judgment for proceeding
Interpretation of clinical and lab deviations from normal range.
Within- subject comparison of data is mandatory.
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DATA RECORDING AND STORAGE
Accurate record of each experiment mandatory for scientific purpose, statutory and other review requirements.
Mode and time of entries should be standardized for future interpretation.
Data should be available in duplicate/triplicate and store at 2/3 different places to avoid accidental loss.