clinical trials overview john janik, m.d
TRANSCRIPT
CLINICAL TRIALS OVERVIEW
John Janik, M.D.
What is a Clinical Trial?
“Clinical trials are research studies in which people help doctors find ways to improve health and cancer care. Each study tries to answer scientific questions and to find better ways to prevent, diagnose, or treat cancer.”
CancerTrials (NCI)
The Drug Development and Approval Process
1. Early research and preclinical testing
2. IND application filed with FDA
3. Clinical trials (phases 1, 2, and 3)
4. NDA filed with FDA
5. FDA validates claim and approves drug
Challenges in the Development of New Agents
Only 10% of new molecular entities that enter late stage clinical trials are approved by the FDA for human use
For new agents tested in patients with cancer the figures are lower approaching only 5% of agents for which an Investigational New Drug (IND) is filed
Challenges in the Development of New Agents
Why Do a Clinical Trial?
What are the Challenges• Lymphoma Incidence is Rising
• Over 40 Different Types and Rising!
• Treatment Dependent on Stage and Prior Therapy
• Overwhelming New Treatment Options
Why Do a Clinical Trial?
Evaluate New Drugs• Phase I - Safety• Phase II - Effectiveness• Phase III - Role in Treatment
Drug Development
• 100,000 Drugs have Antitumor Activity • 1,000 Drugs work in Animal Studies• 100 Drugs have Proper Chemistry Formulation• 10 Drugs pass Phase I Clinical Trials • 5 Drugs pass Phase II Clinical Trials• 1 Drug passes Phase III Clinical Trials
Why Do a Clinical Trial?
Optimize “Therapy”• Explore New Drug Combinations• Minimize Treatment Toxicity • Which Types/Stages of Lymphoma• When in Disease Natural History
Why Do a Clinical Trial?
Other Benefits• Expert Care• State of the Art Treatment • Patient Education• Reduce Treatment Costs
Why Do a Clinical Trial?
Disadvantages• Randomization to “lesser arm” • Unknown or Increased Toxicity • Increased Cost and Time
Types of Clinical Trials
Treatment Trials
Prevention Trials
Screening Trials
Diagnostic Trials
Genetics TrialsQuality of Life Trials
“Phases” of Clinical Trials
Phase I
Phase II
Phase III
Phase IV
Determine the relation
between toxicity and dose schedule of treatment
Phase I
Determine the Safe Dose• Increase Dose in Patient Groups
• Stop Escalating if too Toxic
• Carefully Monitor all Toxicity
Pharmacokinetics Effectiveness Experimental Endpoints
Phase I dose escalation scheme
Limitation of standard Phase I trial design
Ethical – Many patients treated with subtherapeutic dose of agent
Efficiency – Modified Fibonacci scheme results in lengthy trials
Alternatives for phase I clinical trial design
Higher initial starting doses
Accelerated dose escalation
Recruitment of only one patient per dose level until mild toxicity is observed
Accrual then reverts to standard phase I design with accrual of three patients per dose level
Preclinical experiments define dose at which 10% of mice die (LD10)
Additional animal testing performed in another species to confirm toxicity (dog, monkey)
Phase I trials in general are started with a dose that is one tenth that of the LD10 in mice (or most sensitive species)
Starting dose levels for phase I studies
Starting Median Range Unsafe Trials Unsafe Agents
0.1 7 4-14 0 0
0.2 5 3-11 5 2
0.3 3 2-9 11 6
Safety and Number of Dose Levels in 21 Trials (14 Agents) With Varying
Starting Doses
Dose Level Percentage Increase Over Previous Dose Level
1
2 100%
3 67%
4 50%
5-X 33%
Accelerated Dose Escalation Modified Fibonacci escalation
Design (# of PaPts. Increments Intrapatient Stop/ # of
Type Per Dose Between Escalation Switch Patients
Level) Dose Levels Rule Entered
1A 3 40 No NA 39
2B 1 40 Yes First* 24
3B 1 100 Yes First* 21
4B 1 100 Yes Any* 21
Accelerated Titration Design
Clinical Phases of Clinical Trials include Phase I, Phase
II, Phase III and Phase IV
●Phase I
●Phase II
●Phase III
●Phase IV
Phase II
• Determine Effectiveness • Single or Limited Disease Types
• Pharmacokinetics
• Experimental Endpoints
Lymphoma Cheson non-Hodgkin's Lymphomas International Working Group
Solid tumor patients RECIST (Response Evaluation Criteria in Solid Tumors)
Criteria for Measuring Response to Treatment
CR (complete response) = disappearance of all target lesions
PR (partial response) = 30% decrease in the sum of the longest diameter of target lesions
PD (progressive disease) = 20% increase in the sum of the longest diameter of target lesions
SD (stable disease) = small changes that do not meet above criteria
RECIST
MDX-CTLA4 3 mg/kg 6 weeks post treatment
Before treatment After treatment
Mantle cell lymphoma post idiotype vaccine
Proposed European Organization for Research and Treatment of Cancer criteria for assessment of response by FDG-PET
Progressive metabolic disease Increase of SUV >25% Visible increase of FDG uptake (>20% of longest dimension) Appearance of new focus
Stable metabolic disease Increase of SUV <25% or decrease <15% No visible increase of the extent of FDG uptake
Partial metabolic response Reduction of a minimum of 15-25% of SUV after one treatment cycle; >25% after more than one treatment cycle
Complete metabolic response Complete resolution of FDG uptake
4/1/03 5/6/03 8/5/03
[F-18]FDG-PET
Copyright ©2005 American Association for Cancer Research
Kelloff,
Survivor curve
Copyright ©2005 American Association for Cancer Research
Survivor curve
If the level of therapeutic effectiveness is 10%, 29 patients are required to et a
permissible type II error of 5%.
If the type II error is 10%, 22 patients are required.
“Phases” of Clinical Trials
Phase I
Phase II Phase III-Determine if a new
treatment is superior to “standard” treatment. Determine the effects of treatment relative to the natural history of the disease.
Phase IV
Phase III
Compare New and Standard Treatments • Randomized• “New” Treatment Well Studied
Randomization
Stratification
Phase I Phase II Phase III Phase IV
Phases of Clinical Trials
“Post-Marketing” Studies • Expanded Treatment Groups
Under studied groups (racial/gender)Long term benefitLong term riskLow frequency toxicity
Phase IV
1960 1973
1990s 2001
History of the Development of Gleevec for the Treatment of Chronic Myelogenous Leukemia
Imatinib (Gleevec)
Kaplan-Meier Estimates of the Rates of Event-free Survival and
Progression to the Accelerated Phase or Blast Crisis of CML for Patients
Receiving Imatinib
Drug Phases
Kummar et al., Nat Rev Cancer 7:131-9,2007
Study Drug
Drug Development
Differences Between Phase 0 & Phase 1 Trials . ●The primary endpoint established dose limiting toxicities and maximum tolerated dose.Whereas a phase 0 Trial establishes a safe dose-reange for use in subsequent definitive trials. ●The patient population is advanced incurable malignancy in Phase I trials where in a phase 0 trial patients with indolent disease not requireing treatment may be utilized.●The Washout Period is 4 weeks in a phase I trial but 2 weeks in a Phase 0 Trial. ●The Number of patients is usally >20 in a phase I but 12 in a phase 0 trial.
Differences Between Phase 0 & Phase 1 Trials . ●The biomarker assays are not consistently performed in a phase I trial whereas they are integrated into a phase O trial. ●Tumor biopsies are optional in a phase I trial whereas serial tumor biopsies are performed in a phase 0 trial. ●Pharmacokinetic/pharmacodynamic analysis are performed on time in a phase 0 trial whereas they are performed later in a phase I trial.
Differences Between Phase 0 & Phase 1 Trials . ●The dose escalation in a Phase I Trial is guided primarily by toxicity, whereas the desire to achieve a drug concentration is emphasized in phase 0. ●The duration of dosing is multiple cycles in a Phase I Trial whereas limited dosing occurs in a Phase 0 Trial. ●Both the phase I and phase 0 trial evaluate therapeutic benefit.
A written guide to the treatment and research studies.
• Major Sections Study ObjectivesBackground and Rationale Eligibility CriteriaStudy DesignResearch TestsStatistical SectionToxicity Reporting Pharmacy Information
Protocol Components
Protocol Development
Protocol Concept
Stage Review/Approval
Investigator/IND HolderCooperative Group
Protocol DevelopmentDepartment Review
Institutional Scientific Review
IND HolderInstitutional Review Board
Food and Drug AdministrationProtocol Approval
Clinical Trial Monitoring
InvestigatorInstitutional Review Board
Data Safety and Monitoring BoardIND Holder
Food and Drug Administration
1-6 Months
Time Line
2-3 Months
2-3 months
2-6 years
NCI Protocol Review Branch Review – Internal review PRMC - Protocol Review and Monitoring Committee – Scientific reviewIRB - Institutional Review Board – Ethical reviewRSC - Radiation Safety Committee – Research related radiation reviewRAC - Recombinant DNA Advisory Committee – Gene therapy reviewCTEP – Sponsor for NCI supported studies of investigational agents FDA – For investigator held INDs
NCI Protocol Review and Monitoring Committee (PRMC)
Provide prospective scientific review of NCI intramural clinical trials
Identify high priority trials
Mandate of the NIH for all intramural protocols
Institutional Review Board Protection of Human Subjects from
Research Risks Risks are minimized and reasonable in relation
to anticipated benefits • Assess risks in relation to accepted practices
• Minimize risks: sound research design
• Assess benefits to subjects
• Assess importance of knowledge that might
reasonably be obtained
Institutional Review Board
Monitor data to ensure safety • Monitors Adverse Events • Data, Safety and Monitoring Boards
(DSMB)
Other Safety Reviews
Gene TherapyRAC Recombinant DNA Advisory CommitteeOBA Office of Biotechnology Activities
Research-related Radiation Radiation Safety Committee
Food and Drug Administration
To promote the public health by promptly and efficiently reviewing clinical research and taking appropriate action on the marketing of regulated products in a timely manner
To ensure that human drugs are safe and effective
Clinical Trial Venues • Single v Multi-Institutional
Phase I and II• Cooperative Groups
Phase III and IV
• PharmaceuticalPhase I-IV
Logistics of Clinical Trials
Annual Accrual • Pediatrics: 50% • Adults: 3%
Barriers • Physician Bias
Time and cost
• Patient BiasLack of education“Guinea Pig” syndrome Cost and time
• Insurance Denial
Barriers to Clinical Trials
Could I Receive Less Effective Treatment?
• Phase I- Usually restricted to patients who have received standard therapy• Phase II- May be less or more effective• Phase III- Compares a new but well studied regimen to standard care. Treatment could be more effective.
Frequently Asked Questions
Will the Research Be Placed Above my Well Being?
• No this should not happen. Investigators are obligated to put patient care above the study. However, confidence in your treating physician is essential.
Conflict of interest should be addressed in the protocol and with the patients
• Studies are closely monitored: PI, IRB, DSMB, FDA
Frequently Asked Questions
Will I receive a placebo? • Most oncology trials do not give placebos. If you randomize to a “less treatment” arm, you will be told. • A “less treatment” arm is only included when we do not know if “more treatment” is necessary.
More treatment may be more toxic and no more effectiveData Safety and Monitoring Boards closely monitor
randomized studies
Frequently Asked Questions
Frequently Asked Questions
Why Conduct a Trial if We Already Know Which Treatment is More Effective?
• Very unwise to conclude superiority of a new treatment without a proper study
Diffuse Large B-cell Lymphomas
Adapted from Fisher. N Engl J Med. 1993;328:1002.
Pat
ien
ts (
%)
Years After Randomization
100
80
60
40
20
00 1 2 3 4 5 6
CHOPm-BACODProMACE-CytaBOMMACOP-B
How can I find Out About Clinical Trials? • Ask your physician • Resources
Lymphoma Research Foundation National Cancer InstitutePhysicians Data Query (PDQ) Internet
Frequently Asked Questions