Scale-Up and Technology Transfer

Scale-up and technology transfer describe how a pharmaceutical process developed at small scale is reproduced reliably at the larger scale and the different site needed for commercial supply. The aim is that a product made at full production scale has the same quality as the material on which development and clinical studies were based, despite changes in equipment, batch size, and operating conditions.

Definition

Technology transfer is the documented process of conveying product and process knowledge between development and manufacturing, or between manufacturing sites, to achieve product realisation, while scale-up is the adjustment of an established process to a larger batch size and equipment train while maintaining product quality.

Scope

This entry covers the principles of moving a process from laboratory or pilot scale to commercial scale, and of transferring it between development and manufacturing or between sites. It addresses the knowledge that must be transferred, the scale-dependent variables that affect quality, the role of equivalence and post-approval change frameworks, and the documentation that demonstrates a successful transfer. It is a reference treatment of these activities, not an operational procedure for a specific product.

Core questions

• What product and process knowledge must be transferred for manufacture to succeed elsewhere?
• Which variables change with scale and how do they affect critical quality attributes?
• How is equivalence between scales or sites demonstrated?
• How are scale-up and post-approval changes managed within the regulatory framework?

Key concepts

• Sending and receiving unit
• Process knowledge transfer
• Scale-dependent parameters
• Pilot, registration, and commercial scale
• Comparability and equivalence
• Scale-up and post-approval changes (SUPAC)
• Gap analysis and transfer protocol
• Process robustness across scales

Mechanisms

Scale-up and transfer succeed when the knowledge that defines a process, including its critical quality attributes, critical process parameters, and control strategy, is conveyed completely from a sending unit to a receiving unit and verified at the new scale or site. Because some process variables (such as mixing intensity, heat and mass transfer, and residence time) change with equipment and batch size, scale-up requires identifying which parameters are scale-dependent and adjusting them so that the product attributes are preserved. A transfer protocol with predefined acceptance criteria and confirmatory batches demonstrates that the receiving operation reproduces the intended quality.

Clinical relevance

Scale-up and technology transfer protect the continuity and consistency of medicine supply, so that a product reaching patients at commercial scale matches the quality of the material studied during development. This entry describes manufacturing and quality activities and is not a basis for individual diagnostic or treatment decisions.

Evidence & guidelines

Technology transfer is framed within the ICH Q10 pharmaceutical quality system, which identifies it as an element of product realisation, and is detailed in the WHO guidelines on transfer of technology in pharmaceutical manufacturing. Scale-up and post-approval changes for common dosage forms are addressed by FDA SUPAC guidance, and the principles have been synthesised in reviews such as that by Patil and Pethe.

History

Pharmaceutical scale-up drew on chemical-engineering principles of process scale-up but had to accommodate the strict quality and equivalence requirements of regulated medicines. The FDA SUPAC guidances of the mid-1990s gave a structured framework for managing scale and post-approval changes, and the later WHO technology-transfer guidance and ICH Q10 placed transfer within a lifecycle quality system as outsourcing and multi-site manufacture became widespread.

Seminal works

• who-trs961-tt-2011
• ich-q10-2008

Frequently asked questions

Why is a process not simply 'copied' when it moves to a larger scale?

Because some variables that affect quality, such as mixing, heat transfer, and residence time, change with equipment and batch size; scale-up requires understanding which parameters are scale-dependent and adjusting them so that product quality is preserved.

What is the difference between scale-up and technology transfer?

Scale-up changes the batch size and equipment of an established process, while technology transfer conveys the product and process knowledge between development and manufacturing or between sites; the two often occur together when a product moves toward commercial production.