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Process Validation:
A Critical Step in Ensuring
Biopharmaceutical Product Quality

Process validation demonstrates, with documented scientific evidence, that a manufacturing process consistently produces product meeting predetermined quality attributes within defined parameter ranges. It ensures lifecycle-wide consistency, not just a one-time check.

Core Elements
  • Scientific evidence: data-driven records and validation reports.
  • Process understanding: defined CQAs and CPPs and appropriate control strategies.
  • Lifecycle approach: ongoing assurance from development through commercial production.of ADC.

Process Validation Lifecycle

Process validation is not a one-time activity but a continuous process throughout the product lifecycle, divided into three key phases:
  • Phase One

    Phase One
    Process design

    develop and characterize the process: identify CQAs/CPPs, perform process development, risk assessment and scale-down/scale-up studies.

  • Phase One

    Phase Two
    Process qualification

    Confirm performance at commercial scale via validation batches and supporting studies (e.g., intermediate stability, viral clearance).

  • Phase One

    Phase Three
    Continued process verification

    Routine monitoring, annual product review and periodic revalidation or improvement as needed.

Prerequisites

  • Qualified facilities and equipment.
  • Validated analytical methods.
  • Trained personnel.
  • Approved material suppliers and material control.

Strategy & Methods

  • Use a risk-based validation plan proportional to product and process complexity.
  • Typical requirement: three consecutive successful validation batches (or equivalent requalification, e.g., bracketing and matrixing).
  • Equipment qualification: DQ, IQ, OQ, PQ.
  • Process validation: protocol with on- and off-line validation (each unit operation: ≥ 3 consecutive runs).

Critical Control Points

  • Upstream: cell bank, media, cell density/viability, expression titer.
  • Downstream: purity, clarity, virus removal, intermediate quality.
  • Formulation: pH, osmolality, stability, container closure integrity.

Supporting Studies

  • Virus clearance validation.
  • Intermediate stability studies.
  • Cleaning validation.
  • Sterile filter performance qualification.
  • Container-closure integrity testing.

Acceptance Criteria & Conclusion

  • Process validation is successful when parameters remain within set limits, product CQAs meet specifications, batch-to-batch consistency is demonstrated, and process capability meets targets.

Value

  • A robust, flexible validation program ensures product quality and regulatory compliance, reduces risks and costs (fewer failures/recalls), and provides a solid basis for continuous improvement.