dissolution – biopharmaceutics vision in the office of … · dissolution – biopharmaceutics...
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Dissolution – Biopharmaceutics Vision in the Office of New Drug Products
2015 GPhA Fall Technical Conference November 4, 2015
Paul Seo, Ph.D. Division Director (Acting)
OPQ/ONDP/Division of Biopharmaceutics
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Outline • Division Organization and Responsibilities
– OPQ Standup – A historical perspective
• Current state • Desired state • Initiatives • Additional Considerations • Conclusions/Questions
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OPQ Standup
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Approximately 10 months old!
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A historical perspective • Biopharmaceutics discipline at FDA
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OGD Divisions of
Bioequivalence
ONDQA Biopharmaceutics
Review Staff
OPQ/ONDP Division of
Biopharmaceutics
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Division Organization • 2 Primary Review Branches • 1 Support and Research Branch • Review Branches Organized by
Therapeutic Area • Support and Research Branch focuses on
issues that support review functions (e.g. in silico modelling, IVIVC/R, PKPD, PBPK)
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Approach
ANDAs (QC In-Vitro Release) ANDA supplements Control Correspondence Consults
NDAs NDA supplements INDs Consults
GDUFA PDUFA
Biopharmaceutics
Current State
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Approach
-QC Release Testing (e.g. dissolution) -SUPAC Related PAS-dissolution, In-Vitro Release Tests
-b(1) & b(2) Biowaivers -BCS -QC dissolution -IVIVC/R - SUPAC Related PAS-dissolution -ER Claim -MR Integrity (e.g. in vitro EtOH Dumping)
GDUFA PDUFA
Biopharmaceutics
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• Biopharmaceutics: – The study of the physical and chemical
properties of drugs and their proper dosage as related to the onset, duration, and intensity of drug action.1
• Applying this definition to the regulatory perspective
8 1. The American Heritage® Stedman's Medical Dictionary. Retrieved October 20, 2015.
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Challenges • PDUFA and GDUFA program
responsibilities, timelines, and deliverables are markedly different – Balancing between the programs is
challenging • Historically, approaches to the review
have been different – Finding some parity in approach
• Training of new staff
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GDUFA PDUFA
Approach
Biopharmaceutics
Clinical Relevance
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Why Clinical Relevance? • Conceptually, CRS can apply to any aspect of review.
From a Biopharmaceutics perspective, this impacts QC in-vitro release testing (e.g. Dissolution)
• Provide better test methods and acceptance criteria that are able to identify and reject drug product batches that are likely to perform inadequately in the indicated patient population.
• Evaluate risks based on clinically relevant product attributes, which impact the drug safety and efficacy
• Consistent safety and efficacy performance for the marketed product compared to those for the clinical trial formulation
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• Better understanding of critical quality attributes and manufacturing processes
• Helps link the product quality (e.g. formulation science, chemistry, manufacturing) to the safety and efficacy of the product (i.e. Bioequivalence)
• Enhanced lifecycle management (e.g. post approval changes)
• CDER Organizational Strategy: Clinically Relevant Quality Standards
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Why Clinical Relevance?
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Biopharmaceutics Approach
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In-Vivo
In-Silico
In-Vitro
Biopharmaceutics
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Biopharmaceutics Approach
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In-Vivo
In-Silico
In-Vitro
Biopharmaceutics
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Current State
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Biopharmaceutics
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Current State
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Biopharmaceutics
• Dissolution assessment often independent of in vivo assessment
• Dissolution methodology sometimes oversimplified for higher risk products (e.g. apparatus selection, media, etc.)
• Sometimes methodology is overdiscriminating as in vivo results can be “less sensitive” • CRS via IVIVC or in silico
supported can lead to wider specifications
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Market Regulatory Decision
• Approval / Complete Response
• Phase IV Commitments
Clinical Development (Phase 1, 2,
3)
• Phase 1-3 Trials • Human PK • Dose Selection • Bioavailability • Formulations
Bridging
Preclinical Development
• PK/PD • ADME • Safety • Pre-formulation • Drug Delivery
• PK Optim. • Dosage Form
Selection • Modeling
Discovery
•Medicinal Chemistry •Target ID •Receptor Binding
New Drug Development
• Agency sees smaller “snapshot” • Larger datapool often not used • Misconception where CRS consideration occurs
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Product Selection
•Securing API
Product Development
• Formulation Optimization
• Monograph Analysis
• Pilot BE (not always)
Exhibit Batches
• Testing, manufacturing, and production
• Quality Systems
• Stability
Pivotal BE/Clinical
Trials • Individual
Product BE Guidance
• General BA/BE Guidance
Regulatory
• ANDA Filing • Amendments • Approval /
Complete Response
Market
Generic Drug Development
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• Agency sees smaller “snapshot” • Larger datapool often not used • Misconception where CRS consideration occurs
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Desired State (A/NDA) Early product method development data
In Vivo Data
In Vitro Data
In Silico Data
Clinically Relevant In Vitro Acceptance Criteria
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Desired State • CRS for dissolution is difficult with the in
vitro and in vivo data currently contained in a typical ANDA
• Need the extra data not always contained in regulatory submissions (e.g. product/method development data)
• Aims to leverage in silico modeling to handle the extra data and potential for relationships or correlations
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Initiatives: How do we get there? • Currently focusing on higher risk products
– Modified Release Formulations
• Encourage IVIVC Applications
• Encourage QBD applications/concepts
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• Requests for additional information: – Solubility data for the drug substance covering the pH range
– Formulation dependent dissolution method development
encouraged. Method development showing selection of optimal test method (e.g. selection of the equipment/apparatus, media, agitation/rotation speed, pH, assay, sink conditions, surfactant selection criteria, etc.)
– Any testing conducted to demonstrate the discriminating ability of the selected dissolution method for the drug product manufactured under target conditions vs. the drug products that are intentionally manufactured with clinically meaningful variations (i.e. aberrant formulations and manufacturing conditions) for the most relevant manufacturing variables
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Initiatives: How do we get there?
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Requests for additional information: • Any IVIVC/R pre-analysis (i.e.correlation
studies conducted in development stage, but not submitted) could be submitted
• Any computational modeling (e.g. mechanistic IVIVC, PBPK absorption/dissolution modeling, simulations) and its related dataset/database could be submitted
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Modifying the Biopharmaceutics Approach
• Plans for leveraging FDA knowledgebase if/where applicable – Physicochemical attributes
• Log P, pKa
– Relevant physiological parameters • GI Transit/Residence Time, pH, biological
volumes, absorption parameters, fraction unbound in plasma, blood to plasma ratio, etc.
– Publicly available information (product labeling, publications, FOIA documents)
• PK Parameters, Excipient effects, Permeability/absorption
• In Silico Modeling and Analysis
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In Silico Modeling • Many approaches possible
– Curve fitting exercise (data fit to several models leading to model selection criteria)
• Correlations may not always be possible, but other information can be discerned to make CRS
• Best examples so far include clear, stepwise description of the thought process
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Additional Considerations • Open to different dissolution apparatuses with
justification • “Bio-Relevant Dissolution”
– Apparatus? – Media? – In-Vivo Correlated? From QC perspective, could be none or all of these. Application/Product specific.
• Various apparatuses often explored in development phase but not seen as “viable” as QC. – Could still have relevance in modeling
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Additional Considerations • Exploring the use of IVIVR (when IVIVC
has failed) – Can provide a rank-order relationship b/w
dissolution and systemic exposure – While not a surrogate for BE, could provide
determination of clinically relevant specifications
– Explorations using mechanistic modeling in support of IVIVC/R
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Conclusions • Evolving thought processes/Flexible • Open to exploring new approaches/methodologies • More early development data should be submitted in
support of QC in vitro release tests – Computational modeling a useful tool with larger data
pool • Clinically relevant specs could:
– Allow for wider in vitro release acceptance criteria – Provide more insight during post approval changes – Increased confidence in release and stability data
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Acknowledgements • Lawrence Yu, Ph.D. • Sarah Pope Miksinski, Ph.D. • John Duan, Ph.D. • Rik Lostritto, Ph.D. • Sandra Suarez, Ph.D.
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Thank you
Questions?
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