Multivariate Tools for Modern Pharmaceutical Control FDA Perspective
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1 Multivariate Tools for Modern Pharmaceutical Control FDA Perspective IFPAC Annual Meeting 22 January 2013 Christine M. V. Moore, Ph.D. Acting Director ONDQA/CDER/FDA
2 Outline Introduction to Multivariate Analysis (MVA) Utilization of MVA Chemical Analysis - Spectroscopy Identity of Complex Products Process Monitoring and Control Real Time Release Testing Considerations for MVA Models Concluding Remarks 2
3 Multivariate Analysis Multivariate Analysis Definition (MVA) - Any statistical technique analyzing the relationship of simultaneous and combined effects of more than two variables Examples of Multivariate Analysis Methods Multiple Linear Regression Principal Component Analysis (PCA) Partial Least Squares (PLS) k-nearest Neighbor (knn) Artificial Neural Networks (ANN) 3
4 Multivariate Analysis Features of Multivariate Analysis Uncover inherent patterns in data Discover similarities and differences in data Identify features that explain the patterns and outliers Build models to predict for classification or quantitation Limitations of Multivariate Analysis Requires calibration, often using a reference method Data driven model does not reveal underlying mechanisms Valid only within the ranges/conditions studied 4
5 Example Uses Example Methods Data Exploration & Clustering HCA knn PCA SVR Classifying & Discrimination? Cooman s plot ANN CLASS 1 OUTLIERS Quantitative Prediction & Correlation CLASS 1&2 CLASS 2 5
6 Chemometric Analysis Chemometric methods for spectroscopy are the most common MVA method seen in pharmaceutical regulatory filings Useful in support of in-process measurements for Process Analytical Technology (PAT) and/or Real Time Release Testing (RTRT) Potential uses include: Identification of materials (raw materials, finished products) Determination of water or residual solvents In-process blending analysis In-line/at-line determination of assay and content uniformity 6
7 Quantitative Assay Determination of Number of Factors Assay by Near Infra Red (NIR) analysis. 7
8 Regression Models for Predicting Impurities Analysis of Dermatan Sulfate (DS) in heparin samples using NMR. Regression Models Multiple Variable (MLR) Ridge Regression (RR) Partial Least Squares (PLS) Support Vector (SVR) R 2 = 0.99 RMSE = 0.21 All Regression M odels Performed Equally Well 8
9 Rate of Change Measurement Blend Uniformity Example Excipient Run #1 Excipient Run #2 Drug Substance Run #1 Drug Substance Run #2 Uniformity of excipients and blend determined by on-line process monitoring by NIR 9
10 Characterizing Complex Products Characterization of complex / heterogeneous products can be difficult Identity, purity Chemometrics allows extraction of information from analytical methods Ability to handle multidimensional data Can be used to simultaneously evaluate data from multiple analytical methods May lead to discovery of hidden/unexpected patterns Fingerprint approach May be used to identify trace contaminants Extending methodologies to botanical products Expert Analyst Expert System 10
11 Classification of Good Heparin Samples Heparin NMR Data OSCS Good Product Contaminant Reference: Q.Zang, et. al, J.Pharm.Biomed.Anal.(2011), doi: /j.jpba
12 Botanical samples Different plant parts distinguished by fingerprinting analysis PCA by UPLC fingerprints 12
13 Role of Multivariate Statistical Process Control (MSPC) Routine monitoring consistency checking identification of atypical operation Part of RTRT approaches Used to assure that operation is within ranges previously studied Potential to use as a surrogate as part of RTRT control strategy Potential to support reduced testing approach 13
14 Multivariate Statistical Process Control Parameter 2 Quality Product Parameter 1 Parameter 2 Parameter 1 time time OOS Product? (adapted from T. Kourti, PAT, 1 (1), p ) Process variables often track together Reducing the dimensionality of the process into principle components (combined variables) can simply fault diagnosis Multivariate approach can identify some quality issues that univariate analysis might not detect in RTRT approach 14
15 Process Signatures Crystallization Wet Granulation Many batch processes are path dependent Arriving at the same endpoint does not assure the same quality product Often important physical or chemical attributes are not measured routinely but can affect downstream product performance 15
16 Example: Routine Monitoring of High Shear Granulation Aim of MSPC model is to understand current state of the process and flag deviations MSPC of High Shear Granulation MSPC of a Granulation Process 10 5 First Score Dry Mixing Solution addition Rinsing water addition Kneading Pre-mixing Water addition Rinsing Time SIMCA-P :53:14 Kneading 16
17 Real Time Release Testing Real Time Release Testing (RTRT) is the ability to evaluate and ensure the quality of in-process and/or final product based on process data Typically include a valid combination of measured material attributes and process controls ICH Q8(R2) 17
18 Example: Surrogate Dissolution Model in RTRT PROCESS DATA Multivariate Model (e.g., MSPC) PC2 B3 B1 B2 Calibration Data B4 RAW MATERIAL DATA Manufacturing Data PC1 Quantitative Prediction by PLS Measured Predicted 18
19 Considerations for MVA Development and Implementation Training data selection Model development Validation Implementation The principles of model building are the same regardless of the use of the model! 19
20 MVA Model Development Considerations Calibration data Include potential sources of variance (e.g., operating conditions, raw materials, scale) Cover intended areas of operation/design space Appropriate distribution of samples over the analysis range Model development Data pre-treatment / scaling Selection of parameters/spectra Number of model factors justified (avoid overfitting) Model validation Internal validation using subsets of calibration data External validation using an independent data set Ability to detect bad material/batches Robust and representative reference method 20
21 MVA Model Maintenance and Update Considerations Model results may change as new sources of variability are introduced Changes in raw material, process or analyzer Evaluation of outliers as part of maintenance Can detect atypical trends with process and/or analyzers Usually implemented through examination of residuals Outliers do not imply a failed batch! Develop and document procedures on how to evaluate and update the calibration model Done under the manufacturer s quality system Include frequency and methods of periodical model evaluation Depth of validation done on updated model, depending on level of change 21
22 Considerations for Setting Acceptance Criteria for MSPC RTRT models Based on scientific rationale Allowable deviation from the historical process average What is the highest deviation experienced so far? Address risk of accepting marginal batches and rejecting good batches Use historical knowledge and information from development 22
23 Future Growth Opportunities for MVA Identity of complex molecules Routine use of MSPC as part of continual process verification Monitoring in support of RTRT Integration of multiple sensors for control of entire process Implementation of feed-back or feed-forward control Control to a process signature Control of continuous manfacturing Further development of data management tools 23
24 Considerations for Submission of Models Level of detail in submission should depend on the importance of the model to the overall control strategy Low Impact Model (e.g., models for development) General discussion of how model was used to make decisions during process development Medium Impact Model (e.g., design space models) - More detailed information about model building, summary of results and statistical analysis - Discussion of how the model fits into the control strategy High Impact Model (e.g., RTRT models) Full description of data collection, pretreatment and analysis Justification of model building approach Statistical summary of results Verification using data external to calibration set Discussion of approaches for model maintenance and update 24
25 Interactions with FDA Request meeting according to guidance Formal Meetings Between the FDA and Sponsors or Applicants Clearly state as CMC meeting for RTRT Both CMC and GMP questions can be included End of Phase II or Pre-supplement submission is a good time to start dialogue Initially, not all details or data are expected to be available Discuss desired or expected approach Ask specific questions Additionally, a Pre-Operational Review (or Pre-Operational Visit, POV) can be requested See PAT Guidance (2004) or ORA Field Management Directive
26 Communicate Early and Often! 26
27 Concluding Remarks Multivariate models can be used for a variety of ways in pharmaceutical manufacturing Assay or uniformity measurements by spectroscopy Identity of complex products Monitoring and/or control of routine production Support of RTRT Mathematics and model building approaches are similar for all approaches FDA supports implementation of MVA using a science and risk based approach Recommend discussions with the Agency before implementation of novel approaches 27
28 Acknowledgments Bogdan Kurtyka (FDA) Sharmista Chatterjee (FDA) Weida Tong (FDA) Cindy Buhse (FDA) Bill Welsh (UMDNJ) 28
29 g{tç~ çéâ4 Questions, comments, concerns: 29
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