Webinar 7 April Cell & gene therapies 30 minutes

Are you ready for FDA
questions about impurities?

WHAT to measure - and HOW

When you submit an IND for a Cell or Gene Therapy product, guidelines state that you must measure process-related impurities in the drug substance and monitor process performance parameters for process consistency.

Often there is no impurity ELISA available – or the host cell protein (HCP) coverage of the ELISA is low. So how do you find a good impurity assay?

In 30 minutes you get an overview of the documentation guidelines for process related impurities in cell and gene therapies. You are also introduced to a mass spectrometry method to monitor multiple proteins with one assay.

About this webinar:

How do you document process related impurities in cell and gene therapies?

Host cell protein analysis of gene therapies


  • Do you have trouble finding an ELISA that covers all proteins present in your product from the expression system?
  • Is the coverage of your ELISA lower than expected?
  • Would you like to know how you can easily quantify specific process related impurities?


If you work on gene therapies and can answer YES to at least one of the above, this webinar is relevant for you.

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Do you know that a good impurity assay for gene therapies should …

… be able to measure the majority of proteins in the early process, and cover HCPs that potentially could end up in the product?

… detect with high sensitivity and specificity the few impurities in the drug substance?



Cell and gene therapies are much more complex than recombinant protein drugs. Often several organisms are used to produce the product. This results in a broad population of process-related impurities from different sources, such as viral proteins, host cell proteins and growth medium.

With this complexity, it can be very difficult to find a suitable commercial HCP ELISA kit that can handle the challenge. Therefore, many cell and gene therapy developers search for an alternative to ELISA. Especially, since development of a sufficient ELISA assay could take years – if it is even possible?

protein analysis services

But why are process-related impurities a concern?

Regulatory authorities and biologics developers have become increasingly aware of the impact protein impurities may have on patient safety and product stability.

It has been observed that host cell proteins may:

  • Cause immunologic reactions in patients
  • Decrease drug product stability
  • Modify the drug function


Therefore, you should

setup an impurity analysis in early process development. So you can monitor HCP clearance all the way from process samples to the purified drug product.

Good news:

This method completely outmatches ELISA

With mass spectrometry, it is easy to measure and document both a broad population of impurities as well as specific HCPs in cell and gene therapies.

In this webinar, we both go over the guidelines for cell and gene therapies. And we show how to analyze the entire HCP population in complex biopharmaceutical products, using mass spectrometry.

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In just 30 minutes, Ejvind Mortz, COO and Head of Development, covers:

Ejvind Mørtz, Alphalyse talks on impurities in gene therapies

  • A walk-through of the newest impurity guidelines from regulatory agencies.
  • Short explanation of how mass spectrometry can quantify all protein impurities.
  • How to select a suitable ELISA with the highest HCP coverage.
  • Customer cases to show how mass spectrometry was applied to cell and gene therapies.
protein analysis services

We have conducted more than 100 projects – so far

The Alphalyse laboratory is probably the most experienced in the world when it comes to HCP analysis by mass spectrometry. In 2020 we were the first to present a comparison of HCPs found in commercial mAbs – including a list of impurities of concern.

We believe that mass spec can replace ELISA as the HCP analysis approach for our future projects.
European biopharma company
Chief Scientific Officer

Examples of companies who used our services:

  • customers
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This webinar is worth your time, if you:

  • Manage the process development of cell or gene therapies.
  • Consult for a company that cannot find or develop a suitable ELISA.
  • Have (the slightest) doubt about the impurity guidelines for cell/gene therapy products.

Or simply have an interest in the newest technologies for Host Cell Protein analysis.

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After participating, you..

  • Know how regulatory agencies prefer the documentation of process-related impurities.
  • Have seen examples of results from HCP analysis of gene and cell therapies.
  • Understand how mass spectrometry can be applied to products originating from multiple expression systems.


protein analysis services

– About the webinar –


7 April 9am EST / 15:00 CET


7 April 1pm EST / 19:00 CET

It takes less than a minute to register:
Just press the button and fill in your name and work email in the pop-up box.

Finish by pressing ‘Register Now’.

After signing up, you will receive an email with a link to the webinar.
It works in all web browsers, and on all devices (laptop, PC, phone) – with no need to download anything.

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CRO Denmark

Still wondering if you should sign up?

Here are 3 reasons why it’s worth your time:

  • You will get a new perspective on the concept of HCP analysis – even if you work with it on a daily basis.
  • Attending this webinar may save your project timeline, by showing you how to provide the right documentation needed later on in the clinical stage approval.
  • It’s free and only takes 30 minutes of your time.
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