Category: facility

The Challenge of Cleanroom Classification Harmonization

In the world of pharmaceutical manufacturing, cleanroom classifications play a crucial role in ensuring product quality and patient safety. However, a significant hurdle in the global harmonization of regulations has been a pain in our sides for a long time, that highlights the persistent differences between major regulatory bodies, including the FDA, EMA, and others, despite efforts to align through organizations like the World Health Organization (WHO) and the Pharmaceutical Inspection Co-operation Scheme (PIC/S).

The Current Landscape

United States Approach

In the United States, cleanroom classifications are primarily governed by two key documents:

  1. The FDA’s “Sterile Drug Products Produced by Aseptic Processing” guidance
  2. ISO 14644-1 standard for cleanroom classifications

The ISO 14644-1 standard is particularly noteworthy as it’s a general standard applicable across various industries utilizing cleanrooms, not just pharmaceuticals.

European Union Approach

The European Union takes a different stance, employing a grading system outlined in the EU GMP guide:

  • Grades A through D are used for normal cleanroom operation
  • ISO 14644 is still utilized, but primarily for validation purposes

World Health Organization Alignment

The World Health Organization (WHO) aligns with the European approach, adopting the same A to D grading system in its GMP guidelines.

The Implications of Disharmony

This lack of harmonization in cleanroom classifications presents several challenges:

  1. Regulatory Complexity: Companies operating globally must navigate different classification systems, potentially leading to confusion and increased compliance costs.
  2. Technology Transfer Issues: Transferring manufacturing processes between regions becomes more complicated when cleanroom requirements differ.
  3. Inspection Inconsistencies: Differences in classification systems can lead to varying interpretations during inspections by different regulatory bodies.

The Missed Opportunity in Annex 1

The recent update to Annex 1, a key document in GMP regulations, could have been a prime opportunity to address this disharmony. However, despite involvement from WHO and PIC/S (and through them the FDA), the update failed to bring about the hoped-for alignment in cleanroom classifications.

Moving Forward

As the pharmaceutical industry continues to globalize, the need for harmonized regulations continues to be central. I would love to see future efforts towards harmonization here that would:

  1. Prioritize alignment on fundamental technical specifications like cleanroom classifications
  2. Consider the practical implications for manufacturers operating across multiple jurisdictions

While the journey towards full regulatory harmonization may be long and challenging, addressing key discrepancies like cleanroom classifications would represent a significant step forward for the global pharmaceutical industry.

Viral Controls in Facility Design

Facility design and control considerations for mitigating viral contamination risk is a holistic approach to facility design and controls, considering all potential routes of viral introduction and spread. A living risk management approach should be taken to identify vulnerabilities and implement appropriate mitigation measures.

Facility Considerations

  • Segregation of areas: Separate areas for cell banking, small-scale and large-scale upstream cell culture/fermentation, downstream processing, media/buffer preparation, materials management, corridors, and ancillary rooms (e.g. cold rooms, freezer rooms, storage areas).
  • Traffic flow: Control and minimize traffic flow of materials, personnel, equipment, and air within and between areas and corridors. Implement room segregation strategies.
  • Air handling systems: Design HVAC systems to maintain appropriate air quality and prevent cross-contamination between areas. Use HEPA filtration where needed.
  • Room Classifications
    • For open operations:
      • Open sterile and aseptic operations must be performed in an environment where the probability of contamination is acceptably low, i.e. an environment meeting the bioburden requirements for a Grade A space.
      • Open bioburden-controlled processing may be performed in an ISO Grade 8/EU Grade C or EU Grade D environment as appropriate for the unit operation.
      • Open aseptic operations require a Grade A environment. Maintaining a Grade A cleanroom for large bioreactors is not feasible.
    • For closed operations:
      • Closed systems do not require cleanroom environments. ICH Q7 states that closed or contained systems can be located outdoors if they provide adequate protection of the material.
      • When all equipment used to manufacture a product is closed, the surrounding environment becomes less critical. The cleanroom requirements should be based on a business risk assessment and could be categorized as unclassified.
      • Housing a closed aseptic process in a Grade C or Grade B cleanroom would not mitigate contamination risk compared to an unclassified environment.
      • For low bioburden closed operations, the manufacturing environment can be unclassified.

Equipment Considerations

Closed vs. open processing: Utilize closed processing operations where possible to prevent introduction/re-introduction of viruses. Implement additional controls for open processing steps.

Closure LevelDescription
Closed EquipmentSingle use, never been used, such as irradiated and autoclaved assembles; connections are made using sterile connectors or tube wielders/sealers
Functionally closed equipment: cleaned and sterilizedOpen vessels or connections that undergo cleaning and sterilization prior to use and are then aseptically connected. The connection is then sterilized after being closed and remains closed during use.
Functionally closed equipment: cleaned and sanitizedOpen vessels or connections that are CIPed including bioburden reducing flushes, but not sterilized before use and remain closed during use
OpenConnections open to the environment without subsequent cleaning, sanitization or sterilization prior to use

Operational Practices

  • Personnel controls: Implement rigorous training programs, safety policies and procedures for personnel working in critical areas.
  • Cleaning and sanitization: Establish frequent and thorough cleaning protocols for facilities, equipment, and processing areas using appropriate cleaning agents effective against viruses.
  • Material and equipment flow: Define procedures for disinfection and transfer of materials and equipment between areas to prevent contamination spread.
  • Storage practices: Implement proper storage procedures for product contact materials, intermediates, buffers, etc. Control access to cold rooms and freezers.

Additional Controls

  • Pest control: Implement comprehensive pest control strategies both inside and outside facilities, including regular treatments and monitoring.
  • Water systems: Design and maintain water systems to prevent microbial growth and contamination.
  • Process gases: Use appropriate filtration for process air and gases.
  • Environmental monitoring: Establish environmental monitoring programs to detect potential contamination early.