Cell-Therapy Manufacturers Get Creative on Checking Particulates

Manufacturers of cell-containing products are adopting new techniques to work around unclear regulatory guidance on particulates. That’s the experience of Diana Colleluori, PhD, principal chemistry, manufacturing and controls (CMC) consultant at Biologics Consulting.

According to Colleluori, cell-containing products can be harder to visually inspect for particulates, as they’re not clear and are often stored in opaque bags.

“Processing and testing cell-containing products already has challenges because they can’t be terminally sterilized,” she explains. “It’s also harder to make a visual assessment to meet regulatory requirements because they already contain cells and the final product is usually in a cell-freezing bag.”

The particulates are mostly (90%) plastic that enter the product from contact with the inside of single-use equipment used during manufacturing, she says, adding that other particulates can enter from product manipulation and, thus, it’s best to try to minimize this.

Companies that Colleluori has worked with have tackled this problem by running their process with the formulation buffer, but minus cells, she continues. This allows them to assess particulates in a clear solution, outside of a bag, which they can then extrapolate to running the same process with cells.

“By testing visible and sub-visible particles in those samples, you can prove your product contact materials are expected to meet the limits for your cell-containing products,” according to Colleluori.

The company can also run quality control tests on a small sample of the final product. Among the tests carried out are those based on the United States Pharmacopeia (USP) chapters 790 for visible particulates and injections,1790 for visual inspections of injections, and 788 for the sub-visible particles.

In addition, EU guidance on visual inspection of particles can also be relied upon. Which tests are run should depend on the method of administration, adds Colleluori.

“If you’re doing an intramuscular injection, it’s probably a little less rigorous than an intrathecal injection of products that have stricter regulations on the number of particles and sub-particles that can be present,” she says.

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Scaling Cell and Gene Therapy Manufacturing

As cell and gene therapies (CGTs) move closer to mainstream clinical use, manufacturers are under growing pressure to bridge the gap between scientific breakthroughs and commercial reality. To explore this transition, GEN talked with three industry leaders, and here’s what we learned.

GEN: In today’s bioprocessing for cell and gene therapies, what is the most crucial business challenge and why?

Jonathan Wofford, COO, Title21 Health Solutions: Currently, the most crucial business challenge to solve in cell and gene therapy bioprocessing is scalable, cost-effective manufacturing. While scientific advances and clinical outcomes have accelerated the demand for therapy development, producing consistent, high-quality products at commercial scale remains difficult due to the increasing complexity of processes, limited automation, underdeveloped data-management infrastructures, supply-chain constraints, and patient-specific workflows for autologous therapies.

Justin Irizarry, CEO, OrganaBio: The disconnect between starting material and everything downstream. Despite heavy investment in manufacturing and analytics, the quality and consistency of raw biological material still determines whether a process succeeds. Variable, fragmented sourcing becomes failed runs, slipped milestones, and regulatory risk, and you can’t engineer that variability back out of a living product.

Carol Houts, CEO, Germfree: The most pressing challenge in CGT bioprocessing today is the gap between clinical promise and manufacturing readiness. Developers are advancing therapies faster than the infrastructure, workforce, and supply chain can scale to support them, and that mismatch is costing time and patients.

GEN: What is the most effective way to address these challenges?

Wofford: In theory, the approach should focus on end-to-end process standardization and automation, supported by closed-system manufacturing, digital process infrastructure, and scalable platform technologies. This reduces variability, decreases labor costs, improves regulatory compliance, increases throughput, and enables consistent product quality from clinical development through commercial production. I say in theory because adoption may be limited by the significant upfront investment needed to implement advanced manufacturing technologies.

Irizarry: Vertical integration and co-location: control the chain from donor through processing and testing under one quality system, with a recallable donor pool, identical SOPs across RUO and GMP, and processing near collection sites.

Houts: The most effective response is committing to manufacturing strategy early, not as an afterthought to clinical development. That means purpose-built environments, modular infrastructure that can grow with the program, and partners who understand GMP from day one. The groundwork determines whether a therapy ever reaches the people who need it.

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Hybrid Single-Use and Stainless-Steel Plants the Greener Option

Hybrid biopharmaceutical manufacturing facilities that combine stainless steel (SSTs) and single-use (SUTs) technologies are the “sweet spot” from an environmental sustainability perspective, according to new research. The research compared the environmental impact—specifically, the carbon footprint— of hybrid facilities with those where SUTs are used, arguing that ongoing efforts to decarbonize energy generation may have shifted the metrics.

And the key findings are that the CO2 footprint of SUTs is significantly higher than previously assumed and that key SST process steps can now have a lower carbon footprint than their single-use counterparts.

Lead author Jan Reiners, rer. nat. , from Roche, tells GEN, “For a long time, SUT was considered more sustainable because it avoids the energy needed to clean and steam-sterilize stainless steel. However, this paradigm has now inverted due to the rapid decarbonization worldwide due to the expansion of renewable energy.

“A single-use run at the 2,000L scale generates up to 6.5 tons of CO2e per batch only in plastic and packaging waste. We didn’t do this assessment for a full stainless-steel system, but the hybrid facility used less than half of plastics,” he adds.

Reiners and colleagues used “market-based emissions accounting” data for the analysis, noting it is becoming common for drug companies to decouple emissions from local energy supplies through tools like power purchase agreements and on-site photovoltaic (PV) installations.

“For instance, our own organization, Roche, has recently achieved its global goal of sourcing 100% sustainable electricity across all worldwide operations. And we are not alone: AstraZeneca is reducing energy emissions by 98% by 2026 and transitioning to 100% renewable energy for heat and power. Novartis claims to have become carbon neutral for energy in 2025, as do many other companies,” he says.

The researchers also found that some long-standing assumptions about SUT systems— for example, that they have lower HVAC costs—no longer hold.

“In modern biomanufacturing, cleanroom ISO classifications remain identical for both SUT and SST due to functionally closed processing, while the massive logistics and warehousing required to store SUT consumables actually expand physical space requirements,” continues Reiners. “And finally, the mass of fossil-fuel-based plastics was underestimated and its CO2 impact actually increased by ~30% in updated global life cycle databases like Ecoinvent v3.12.”

Hybrid alternatives

Considering the findings, Reiners and co-authors suggest that, to minimize emissions and costs, biopharmaceutical manufacturers need to combine stainless-steel systems with SUTs.

“Although SUT is less sustainable, it has other advantages like faster product changeover, more flexibility, less investment, but higher running costs. A hybrid facility is the ‘sweet spot’ of combining SUT and stainless steel to reduce the CO2 impact,” he maintains. “Depending on the facility layout, various measures can reduce the footprint, but per se it is about retaining stainless steel for simple, high-volume, resource-heavy operations—like buffer and media preparation—while keeping single-use for the complex, flexible core process like bioreactors.

“In our study, comparing a full-SUT facility to a hybrid facility reduced the material-related carbon footprint by 62%, dropping emissions from 6.5 tons of CO2e to just 2.8 tons of CO2e per batch.”

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STAT+: Pharma tries to tamp down broad China restrictions

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Good morning. All my social media feeds have been filled with Jimothy the raccoon, and I hope your feeds now will be too.

The need-to-know this morning

  • Celldex Therapeutics said its experimental drug barzolvolimab failed in a Phase 2 study in the skin condition prurigo nodularis, sending its shares down in premarket trading. The company is continuing to test the drug in a number of other indications, with data expected in September or October from Phase 3 trials in chronic spontaneous urticaria, which causes chronic hives. 
  • Summit Therapeutics released updated survival data from its Phase 3 HARMONi trial testing the drug ivonescimab in a form of non-small cell lung cancer. The FDA is set to make an approval decision on the drug in the disease by Nov. 14.  

Pharma tries to tamp down broad China restrictions

From STAT’s Daniel Payne: Pharmaceutical leaders are trying to convince policymakers to back off pushes for aggressive restrictions on investments in Chinese firms.

Continue to STAT+ to read the full story…

Engitix Licenses Lonza’s Technology to Advance ADC Therapies

Lonza and Engitix signed a licensing agreement to advance the development of antibody-drug conjugates (ADCs) as therapies for patients with chronic diseases.

Engitix will access Lonza’s ADC technology platform through a single-target license, including the use of SYNtecan E™ linker-payload and complementary GlycoConnect® and HydraSpace®. These technologies are intended to support Engitix’s goal to develop and commercialize therapies.

Lonza, through one of its affiliated companies, is eligible to receive upfront, clinical, regulatory, and commercial milestone payments, plus royalties on net sales of resulting products. Lonza is responsible for manufacturing components that are related to its proprietary technologies, and Engitix will work on the R&D, manufacturing, and commercialization of the ADCs.

Engitix has developed a proprietary human extracellular matrix (ECM) platform that allows the study of disease biology directly in human tissue, according to a company official, who adds that this approach focuses on targets within the ECM itself, offering a differentiated pathway compared to traditional methods that focus on cell surface targets. 

The collaboration enables Engitix to leverage Lonza’s established ADC technology platform to develop differentiated therapeutic candidates designed to selectively deliver potent payloads to tumor-selective targets identified through Engitix’s proprietary human ECM discovery platform, explains Giuseppe Mazza, MD, PhD, CEO and co-founder of Engitix.

‘We are committed to translating our unique understanding of the disease microenvironment into transformative therapies for patients with high unmet medical need,” he continues. “Licensing Lonza’s clinically validated conjugation and linker-payload technologies provides us with a powerful toolkit to develop next-generation ECM-targeted therapeutics with the potential for enhanced efficacy, reduced toxicity and improved therapeutic index.” 

“We are pleased to collaborate with Engitix on this innovative program,” says Jan Vertommen, vice president of commercial development, advanced synthesis, Lonza. “By combining our ADC development and  manufacturing expertise with Engitix’s unique ECM-based discovery platform, we aim to advance next-generation ADCs and unlock new possibilities in targeted therapies for patients.” 

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Job dissatisfaction and health care access uncertainty grows in the U.S., new study finds

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Good morning. I admit that I didn’t finish rereading “The Odyssey” before I saw the movie last weekend, but it’s never too late. For now, scroll down to read a related First Opinion essay and to sign up for office hours with Bob Herman, STAT’s own Homeric chronicler of the business of health care.

Read the rest…

STAT+: ‘Cochlear implant for blindness’ debuts in Europe, could launch in U.S. in 2027

Europeans can now receive a device that can partially restore their vision loss. Americans may not have to wait long to get it, either.

Science Corporation announced Wednesday that European regulators had approved the commercial sale of the startup’s retinal implant that improves eyesight for patients with age-related macular degeneration in their central vision, enough to read books and road signs more clearly. 

“We have a cochlear implant for vision now,” said Science founder and CEO Max Hodak.

Continue to STAT+ to read the full story…

AI is moving inside the device. Who owns the clinical risk?

Tips to mitigate the risk that medtech teams keep leaving unowned as artificial intelligence moves into Class II and III medical devices. By Dr. Sarah Matt, Vital Werks By the time a clinician trusts a wrong output from your artificial-intelligence-powered device, every decision that made the trust possible was made years earlier. How many decisions…

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Medtech CDMO Aptyx names new CEO

Aptyx has promoted CFO David Price to the role of CEO effective immediately, succeeding former Aptyx CEO Gregg Tobin. Price joined the Tempe, Arizona-based medical device contract development and manufacturing organization as CFO in 2025 and is “the right leader to build on Aptyx’s strong foundation and accelerate the company’s continued growth,” said John Pless,…

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