May 16-18, 2011 Beijing, China. Mark Rosolowsky, Ph.D. Vice President, Bristol-Myers Squibb
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1 What You Should Know When You Make Manufacturing Changes to Biotechnology Products May 16-18, 2011 Beijing, China Mark Rosolowsky, Ph.D. Vice President, Global Regulatory Sciences-CMC Bristol-Myers Squibb
2 Disclaimers The information within this presentation represents the views of the presenter and is based on the presenter s expertise and experience 2
3 Overview Comparability - key points for consideration Discuss changes to biotechnology products: During development Post-marketing 3
4 Why are Changes to Biotechnology Products so Complex? Small Molecules Usually synthetic, organic compounds having well defined structures and chemical characteristics Typically produced through chemical synthesis Usually micromolecules having molecular weights of less than 500 Daltons Generally very stable, and not extremely sensitive to heat Biotechnology Products Usually a protein- or carbohydrate-based product with complex structure Either composed of / or extracted from a living organism or produced via cell culture Macromolecular by nature, and usually have a molecular weight greater than 500 Daltons Tend to be rather labile, and are usually very heat- and sheersensitive Tend to be immunogenic 4
5 What is Comparability? ICHQ5E Definitions Comparable: A conclusion that products have highly similar quality attributes before and after manufacturing process changes and that no adverse impact on the safety or efficacy, including immunogenicity, of the drug product occurred. This conclusion can be based on an analysis of product quality attributes. In some cases, nonclinical or clinical data might contribute to the conclusion. Comparability Exercise: The activities, including study design, conduct of studies, and evaluation of data, that are designed to investigate whether the products are comparable. 5
6 Comparability Exercise Considerations No one right answer when deciding a comparability package Decision must be made with consideration of: Product clinical development plan Complexity of the product Stage of development of the product Robustness of analytical methods Existence of relevant animal models Previous health authority interactions 6
7 What is Highly Similar? Comparability does not require quality attributes of pre-change and post-change product to be identical Highly similar depends upon whether: Existing knowledge can adequately support that differences in quality attributes have no adverse impact upon safety or efficacy Side-by-side analysis of post-change vs. prechange product is useful for contemporaneous evaluation 7
8 Comparability is a Sequential Process Quality Non-clinical Clinical and/or Pharmacovigilance If the analytical procedures used are not sufficient to discern relevant differences, then Non-clinical studies may be necessary, if non-clinical studies cannot discern relevant differences, then Confirmatory clinical testing may be necessary OVERALL GOAL: Assess potential impact to safety and efficacy of the product 8
9 Parameters to Consider Production step where changes are introduced. Potential impact of changes to: purity, physicochemical and biological properties considering complexity and degree of knowledge (e.g., impurities, product related substances). Availability of suitable analytical techniques to detect potential modifications Understanding di of relationship between quality attributes and safety and efficacy, based on overall nonclinical and clinical experience. Relevant physicochemical and biological characterization data regarding quality attributes; Need for stability data, including accelerated or stress conditions, to provide insight into potential product differences in the degradation pathways 9
10 Parameters to Consider (continued) Batches used for demonstration of manufacturing consistency; Historical data that provide insight into potential drift of quality attributes Critical control points in the manufacturing process that affect product characteristics, Impact of the process change on the quality of in-process materials & ability of downstream steps to accommodate material from a changed cell culture process; Adequacy of the in-process controls (critical control points & inprocess testing: In-process controls for post-change process should be confirmed, modified, or created, as appropriate, to maintain product quality Nonclinical or clinical characteristics of the drug product and its therapeutic indications 10
11 Risk Assessment Utilize prior knowledge and development studies Categorize risk change of process parameters based upon potential to impact product quality Examples: High: Change to Master Cell Bank (MCB) Moderate: Media composition change using established raw materials, <50% output Low: Step optimization (e.g. flow rate, wash volumes, elution collection criteria) Provides an effective tool for internal discussion of change & subsequent communications to regulators regarding the assessment 11
12 Risk Assessment Model High risk Red = Stop & Reconsider High likelihood to Impact program Change Typ pe Low risk Yellow = Proceed with Caution Moderate likelihood lih to impact program Green = Go Unlikely to impact program High risk Phase of clinical program
13 Example Risk Assessment Tool Total risk score generated by multiplying individual risk factors Each risk factor category has built-in drop-down boxes with potential values Higher values indicate greater risk Team discussion is critical to document thought process that drove the scores ( no one right answer ) 13
14 Evaluating Changes During Development 14
15 Phase-based Approach to Changes Early Development: Before nonclinical studies: Comparability is not generally not a concern Subsequent nonclinical and clinical studies using the post-change product as part of the development process support change Early phases of nonclinical ic l and clinical ic l studies: Comparability testing is generally not as extensive as for an approved product As knowledge and information accumulate, the comparability exercise will generally become more comprehensive
16 Phase-based Approach to Changes During Pivotal Clinical Studies: Changes are discouraged Sponsor should seek scientific advice from the relevant health authorities If process changes are introduced in late (postpivotal studies) stages of development: Thorough comparability exercise is generally required: Physicochemical and biological in vitro studies Clinical pharmacokinetic and / or pharmacodynamic comparability studies may also be required If comparability exercise cannot rule out impact to the efficacy and safety profile: Additional clinical studies may be required 16
17 Guidelines for Acceptance Criteria Setting for Analytical Comparability Release Test Pre Pivotal Development Release Specification 3SD from small number of lots Post Pivotal Development or Commercial Release Specification 3SD from larger number of lots CQA - closer to manufacture history Reported as found but summarized Extended by expert analyst as being comparable Characterization a or not comparable the analyst uses to make the determination. Quantified acceptance criteria where possible. Visual equivalence should have defined criteria Stability Same requirements depending on whether the test is a release test or extended characterization. Same requirements depending on whether the test is a release test or extended characterization. b Stability CQA stress changes demonstrate comparable rate changes c a Orthogonal support for release test or independent attribute assessment for structure-function relationship b If a stability indicating attribute is identified under recommended storage conditions c If a forced degradation or stressed condition degradation product attribute is identified and believed relevant to structure-function
18 Case Study - Development 18
19 Case Study Process Changes Overview of Changes Drug Substance New MCB (higher producing subclone of current MCB) New DS manufacturing site (Site A Site B ) New DS manufacturing process (cell culture and purification) Drug Product New DP manufacturing site (Site X Site Y ) Minor change to sterile filtration (0.1 μm 0.2 μm) Reason for Changes Increase drug substance yield ~4X Manufacturing control COG
20 Comparability Exercise Goal - to ensure the quality, safety and efficacy of drug product produced by a changed manufacturing process How - through collection and evaluation of the relevant data based on process and product knowledge Analytical assays Biological assays Nonclinical data Clinical data
21 Analytical Comparability Established at multiple points In-process Release Release tests Extended characterization tests Stability profile Recommended storage condition Accelerated/Stress storage conditions Downstream Drug substance changes may only be seen in the drug product (release, stability profile)
22 Analytical Acceptance Criteria In-process Comparable process/product related impurity/adventitious agent clearance Release tests Current (pre-change) specification Additional tests may be needed Extended characterization May need to evaluate additional pre-change batches to establish appropriate acceptance criteria Evaluation against historical data (i.e. clinical experience) Side-by-side comparison of pre- and post-change product by various analytical characterization techniques
23 Binding Kinetics by Surface Plasmon Resonance RU Resp. Diff Association Dissociation Time s
24 Electron Spray Ionization Mass Spectrometry Post-change product Slight increase in one subtype observed Reference material (pre-change)
25 Tryptic Peptide Maps Overlay of pre- and post-change materials AU pglu-h H Minutes
26 Comparison of Carbohydrate Profiles by HPAEC-PADPAD Post-change material Pre-change material 26
27 Isoelectrically Focused Lane 1: Reference material (pre-change) Lanes 2 through 5: Post-change material
28 Cation Exchange Profiles Gray line: Pre-change material Black line: Post-change material
29 Evaluating Changes for Marketed Products 29
30 Changes to Marketed Products Changes during life-cycle are inevitable: Yield increases necessary to meet market demand / address cost of goods issues Quality improvements are necessary to adhere to current GMPs Unexpected events require corrective action, such as process parameter changes Vendor / supply issues necessitate use of alternate materials 30
31 Hypothetical Process Evolution Process Step Phase II Phase III & Commercial Process C Process D Process E Cell Bank XYZ-01 XYZ-01.1 Same Same Same Media DE CD-CHO, erdf & Yeastolate Production Conditions No temp. shift Two phase temp. shift Same, Plus Additional Minerals Same Same Same Same Single temp. shift Downstream Sequence Six columns Five columns Same Change of one resin Change of one resin Other Process Changes N/A N/A Centrifugation & filtration parameters Filter changes N/A
32 Case Study Marketed Product 32
33 Case Study: Change in Media Quality: Media component change resulted in minor differences to quality attributes Nonclinical: Study conducted using nonhuman primate model with previously wellestablished concordance to human PK for the product Model had demonstrated sensitivity to changes in: Minor glycosylation alterations Moderate sialic acid profile shifts 33
34 Non-Human Primate Results Serum Concen ntration [ug/ml] Time in Hours Red line = pre-change Blue line = post-change
35 FDA Feedback Quality attributes evaluated against historic data alone deemed insufficient the Agency strongly encourages the use of side-by-side analysis as the most rigorous assessment of comparability Side-by-side comparison required: Since the product approved for marketing authorization was made using the media..., this product should be directly compared to the product produced from the proposed process
36 Regulatory Experiences with Comparability Comparability exercises can be successfully used to support changes Most changes can be supported on Quality attributes alone Specifications alone are generally NOT sufficient to support comparability Additional characterization required Side-by-side analysis preferred by FDA Additional non-clinical & clinical data may be required Safety & efficacy data are generally not required 36
37 In Summary Comparability is a key issue for biotech products There is no single, correct strategy to demonstrate comparability Decision must be made with consideration of multiple factors: Complexity of the product Stage of development of the product Process knowledge & robustness of analytical methods Existence of relevant animal models Previous health authority interactions Comparability should be approached stepwise: Quality Non-clinical Clinical 37
38 Acknowledgements Cheryl Watson Reb Russell Dave Peck Charlene Craig Gary Lazarus 38
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