Demonstrating Bioequivalence of Locally Acting Orally Inhaled Drug Products
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1 Demonstrating Bioequivalence of Locally Acting Orally Inhaled Drug Products Extended Breakout Session 2: Biomarker Strategies Richard C. Ahrens, M.D. Partha Roy, Ph.D. Dale P. Conner, Pharm.D.
2 Regulatory Issues
3 Definition of Biomarker "a characteristic that is objectively measured and evaluated as an indicator of normal biologic processes, pathogenic processes, or pharmacologic responses to a therapeutic intervention." ref: BIOMARKERS DEFINITIONS WORKING GROUP: BIOMARKERS AND SURROGATE ENDPOINTS: PREFERRED DEFINITIONS AND CONCEPTUAL FRAMEWORK. CLIN PHARMACOL THER 2001;69:89-95.
4 Definition of Bioequivalence Pharmaceutical equivalents whose rate and extent of absorption are not statistically different when administered to patients or subjects at the same molar dose under similar experimental conditions
5 Purpose of BE To confirm therapeutic equivalence (TE) Therapeutically equivalent products can be substituted for each other without any adjustment in dose or other additional therapeutic monitoring. The most efficient method of confirming TE is to assure that the formulations perform in an equivalent manner.
6 Topical Corticosteroids Guidance: Topical Dermatologic Corticosteroids: In Vivo Bioequivalence - 2 June 1995 Pharmacodynamic measurement Blanching effect Dose controlled through duration of application (dose-duration) Dose-effect relationship established during each study
7 Plasma Conc. Plasma Concentration-Dose Dose
8 Clinical/PD Response Clinical/PD Dose-Response Log Dose
9 Scientific Issues
10 What do you do if the innovator s doses are on the top of the dose-response curve?
11 What do you do if the innovator s doses are on the top of the dose-response curve? You truly are at the top of the DRC by all clinically relevant measures. The traditional clinical study design is on the top of the DRC, but other designs and/or clinically relevant measures may not be - - e.g. albuterol.
12 RESPONSE Dose-Response to Inhaled Drug 10 B Curve B A Curve A DOSE (Actuations)
13 FEV1 (L) Mean FEV1 Response to Albuterol: Daytime versus Nocturnal Awakening 3.5 MDI ACTUATIONS DAY 2 NIGHT TIME (Min)
14 DOSE (Actuations) Median Dose to Achieve >80% Personal Best FEV DAY NIGHT TREATMENT PERIOD
15 Potency of Norton MDI Relative to Ventolin Bioequivalence Criteria: PC 20 FEV puff Norton = 0.95 puff Ventolin (90% C.I ) 1 4 DOSE OF ALBUTEROL (Actuations) Norton MDI Ventolin MDI
16 Choosing a Relevant Biomarker that is NOT on top of DRC Intent of eno Model Asthma Stability Model
17 What do you do if the innovator s doses are on the top of the dose-response curve? You truly are at the top of the DRC by all clinically relevant measures. The traditional clinical study design is on the top of the DRC, but other designs and/or clinically relevant measures may not be - - e.g. albuterol. Some subjects may be at the top of the DRC, but other subjects are not - - e.g. ICS
18 Subject Selection for ICS BE Studies Both the Asthma Stability Model and the eno Model require selecting subjects who do exhibit dose-response ( responders ). Justified by Portion of patients for whom dose does make a difference give a signal that can be studied. If a non-equivalent product were marketed, it would most make a difference to this population.
19 What do you do if the innovator s doses are on the top of the dose-response curve? You truly are at the top of the DRC by all clinically relevant measures. The traditional clinical study design is on the top of the DRC, but other designs and/or addressing may not be - - e.g. albuterol. Some subjects may be at the top of the DRC, but other subjects are not - - e.g. ICS Use lower doses (if possible) OR increase lower doses
20 Role of Pharmacokinetic Assessments in BE of Inhaled Drugs Comparison of risks for adverse systemic effect Assessment of topical drug delivery to the lung
21
22 FAQ If it s so difficult to show a doseresponse relationship, doesn t that mean that dose doesn t really matter?
23 THE PREDEDENT: Experience With Generic Albuterol 1989 Albuterol off patent 1992 Initial bronchodilitation studies could not identify a significant dose-response for reference inhaler Search for acceptable, valid methodology 1995 First generic albuterol inhaler approved using bioassay method
24 THE PRECEDENT: Involves Concepts of Pharmacodynamic response used to bioassay the quantity of drug delivered Comparison along dose-axis rather than response-axis
25 RESPONSE OVERALL STUDY DESIGN: 2 by 2 Bioassay STANDARD VALIDITY TESTS Highly Significant DRC Parallelism Contrast Preparations Contrast TEST DOSE
26 THE SOLUTION? Inhaled Beta Agonists: Study under circumstances where a dose-response relationship is present. Protection against bronchoprovocation (methacholine, histamine)
27 Potency of Norton MDI Relative to Ventolin Bioequivalence Criteria: PC 20 FEV puff Norton = 0.95 puff Ventolin (90% C.I ) 1 4 DOSE OF ALBUTEROL (Actuations) Norton MDI Ventolin MDI
28 Focused Discussion Response-Scale Or Dose-Scale Analysis?
29 RESPONSE FDAs Dose-Scale Approach (hypothetical data) 10 Reference Curve (Emax Model) Test Dose = 100 mcg 100 mcg Test = 90 mcg Ref Therefore 1 mcg Test = 0.9 mcg Ref. C.I. by "bootstrap" DOSE (micrograms) 200
30 Long Acting Beta Agonists: Appropriate Biomarkers?
31 Lessons Learned From Albuterol Experience STUDY MODEL MUST: Use a clinically relevant outcome (reflect delivery to site of clinical action) Sufficiently steep dose-response => Sufficient statistical power.
32 Inhibition of Methacholine Challenge PC20FEV1 (mg/ml) as a Biomarker for LABA BE in Asthma SAL 100 SAL 50 ALB 90 PLAC Time (hrs) Derom et al. JACI 1992
33 Focused Discussion Biomarkers for LABA Bioequivalence? Candidates Inhibition of Methacholine Challenge Bronchodilation Others? Which to use? How to validate?
34 Inhaled Corticosteroids: Appropriate Biomarkers?
35 Focused Discussion Biomarkers for ICS Bioequivalence? Candidates Exhaled nitric oxide Inhibition of Adenosine challenge Asthma stability model Sputum Eosinophilia? Others? Which to use? How to validate?
36 Focused Discussion Role of Pharmacokinetic Assessments in BE of Inhaled Drugs Comparison of risks for adverse systemic effect Assessment of topical drug delivery to the lung
37 Open Discussion
38 Back Ups
39 Definition of Biomarker "a characteristic that is objectively measured and evaluated as an indicator of normal biologic processes, pathogenic processes, or pharmacologic responses to a therapeutic intervention." ref: BIOMARKERS DEFINITIONS WORKING GROUP: BIOMARKERS AND SURROGATE ENDPOINTS: PREFERRED DEFINITIONS AND CONCEPTUAL FRAMEWORK. CLIN PHARMACOL THER 2001;69:89-95.
40 Definition of Bioequivalence Pharmaceutical equivalents whose rate and extent of absorption are not statistically different when administered to patients or subjects at the same molar dose under similar experimental conditions
41 Purpose of BE To confirm therapeutic equivalence (TE) Therapeutically equivalent products can be substituted for each other without any adjustment in dose or other additional therapeutic monitoring. The most efficient method of confirming TE is to assure that the formulations perform in an equivalent manner.
42 Topical Corticosteroids Guidance: Topical Dermatologic Corticosteroids: In Vivo Bioequivalence - 2 June 1995 Pharmacodynamic measurement Blanching effect Dose controlled through duration of application (dose-duration) Dose-effect relationship established during each study
43 Plasma Conc. Plasma Concentration-Dose Dose
44 Clinical/PD Response Clinical/PD Dose-Response Log Dose
45 Model of Nasal Spray Dosage Form Performance Dosage Form Performance (Device and Formulation) Membrane Site of Activity Clinical/PD Measurements Therapeutic Effect Dosage Form Drug in Solution GI Tract Blood Toxic/Ther. Effect Pharmacokinetic Measurement Dose ln Dose
46 DISCLAIMER The views expressed in this slides/discussion are those of mine and must not be taken to represent policy or guidance on behalf of the Food and Drug Administration.
47 What is a valid biomarker? A biomarker that is measured in an analytical test system with well established performance characteristics and for which there is an established scientific framework or body of evidence that elucidates the physiologic, toxicologic, pharmacologic, or clinical significance of the test results.
48 Clinical Relevance Disease type, severity and progression The Question of Switchability for all approved indications and conditions of use Reflect drug delivery to the site of action site of action: a case of moving target Disease specific: Asthma, COPD Drug specific: ICS, LABA, LAMA Requirements for Biomarkers of Inhaled Drugs to demonstrate BE
49 Non-invasive and Methodology of measurement easy on patient and investigator Capable of dose-response within the clinical dose range mimicking the RLD Reproducible Fast onset and reversibility Requirements for Biomarkers of Inhaled Drugs to demonstrate BE Ref: Dr. Badrul Chowdhury s slides from the morning
50 Challenges Robust Framework for Dose-Response Acceptable BE Criterion Drug Class Specific Lack of suitable biomarkers across diseases Single-Ingredient vs. Combination Product
51 Harmonization across different regions Canada: Airway Eosinophils, eno Europe: Not spelled out, biomarkers with sufficient sensitivity US: eno, asthma stability model (FEV1)
52 a characteristic that is objectively measured and evaluated as an indicator of normal biological processes, pathogenic processes or pharmacologic responses to a therapeutic intervention Specific Sensitive Reproducible Non-invasive Subject acceptability Measurable What is a biomarker? An ideal one?
53 Exhaled Nitric Oxide (eno) Relevant marker of asthma Independent of age and gender Dependent on expiratory flow Reproducible Responsive to ICS Suitable for cross-over BE study Measurable Asthma
54 Induced Sputum Eosinophil number Eosinophil Cationic Protein (ECP) IL-5 Neutrophils TNF-alpha Asthma
55 Asthma Stability Model Inhaled Corticosteroids Dose Scale Approach: FEV1 Asthma
56 Induced Sputum Neutrophil number IL-8 BAL and biopsy Exhaled breath eno exhaled ethane Blood C-Reactive protein TNF-alpha COPD disease markers
57 Experience teaches you to recognize a mistake when you ve made it again. Unknown
58 Typical ICS Study Design Parallel Treatment Groups 1-12 Months of Treatment Baseline PFTs, Sx, etc. ICS Improvement in PFTs, Sx, PEFR (a) high variability (S) (b) shallow sloped DRC (B) (c) carry-over (prevents cross-over)
59 Statistical Power Associated with a Bioassay Study Related to: Variability of responses (S) Steepness of dose-response slope (B) S + B do not function independently, but in concert as the ratio of S/B The smaller S/B, the more powerful the study
60 Computed Sample Size Relationship Between S/B and Computed Sample Size Busse Study (HFA-BDP, QVAR) S/B Ratio Typical Study?? 2 by 2 Study Design
61 Asthma Stability Following Prednisone Burst and 800 mcg/d HFA-BDP 2. Cross-over Prednisone burst Baseline PFTs, Sx, etc. ICS Deterioration in PFTs, Sx, etc.?? 3. Multiple variables examined (58) 4. Estimate S/B for each 5. The lower S/B, the better
62 Computed Sample Size Relationship Between S/B and Computed Sample Size 200 PM FEV1 150 PC20 FEV1 (Methacholine) AM PEFR AM FEF by 2 Study Design 0 AM FEV S/B Ratio
63 Computed Sample Size Relationship Between Crossover and Parallel Study Designs PC20 FEV1 Parallel Design Busse Study (HFA-BDP, QVAR) AM FEF25-75 AM PEFR Crossover Design S/B Ratio
64 Asthma Stability Following High-Dose Corticosteroid Burst RUN-IN PERIOD 4 weeks LOW-DOSE ICS (CFC-BDP 100 mcg/d) 2 weeks high-dose ICS (Budesonide DPI 1600 mcg/d) ENTRANCE CRITERIA: >7% predicted increase between HIGH and LOW- DOSE ICS
65 FEV1 (Liters) QVAR versus Flovent Diskus HFA-BDP FP-Diskus Dose (mcg/day) p-value Regress Parallel mcg QVAR = 0.84 mcg FP (90% CI : )
66 Asthma Stability Following High-Dose Corticosteroid Burst RUN-IN PERIOD Approx. 20% of subjects met this entrance criteria This screening burden => Increased time and cost
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