Article | February 3, 2022

Four Variables Impacting Cell And Gene Therapy Product Development Success


Robust and reproducible manufacturing processes are a critical differentiator in an increasingly competitive and crowded cell and gene therapy space. The FDA predicts that more than 200 applications will be filed per year from 2020 onwards, and 10–20 cell and gene therapy products will be approved annually by 2025. As more products make it to market, manufacturing processes are expected to improve as well. With a myriad of clinical trials currently ongoing worldwide, not every product is going to make it to the finishing line, let alone win the race to commercial success. Apart from clinical efficacy and safety, robustness and reproducibility of manufacturing processes are crucial to the ultimate success or failure of a product.

As more products are launched, some of the determinants of clinical and commercial success are being continuously re-defined. Obtaining regulatory approval for a product is a necessary but not guaranteed condition for success. Therapeutics developers with a first-to-market product, sound clinical data but poor manufacturing processes are in a fragile position to win the commercialization race. But one key success factor that will remain constant is the manufacturing process. As frequently quoted in the cell and gene therapy industry: “the product is the process and the process is the product."

There are four key inter-connected variables exerting pressure on therapeutics developers to improve their processes earlier in the product’s development:


The average time from IND filing to market for monoclonal antibodies is around 7-8 years.When looking at three FDA-approved CAR-T products (Yescarta® [Kite, a Gilead company], Kymriah® [Novartis], and Tecartus® [Kite, a Gilead company]), the average time from IND filing to market is about 3–4 years. The main driver for reduced development times is the changed clinical trial paradigm. It is not uncommon for a Phase 2 clinical trial to be positioned as “pivotal” – for example, Celgene/BMS and Bluebird Bio’s bb2121 CAR-T program – KarMMa Phase 2 pivotal study], or Poseida’s P-BCMA-101 pivotal Phase 2 trial. Positioning Phase 2 (or, combined Phase 1/2) as pivotal puts an onus on therapeutics developers to have a robust and reproducible manufacturing process already in place for Phase 1/2.


Therapeutic indication crowding has been cited as a concern in the cell and gene industry, as multiple therapeutics developers target the same diseases. This is particularly relevant in the context of rare diseases and potentially curative therapies. Unlike traditional therapeutic approaches, cell and gene therapies for rare diseases have the potential to be curative and as patients are “cured”, the already relatively small patient population shrinks. There are, for example, at least 15 gene therapy candidates in clinical development for Duchenne muscular dystrophy (DMD), 11 products in clinical development for hemophilia B, and 9 clinical products for Beta-Thalassemia. The commercial implications of this cannot be overlooked and contribute to the highly competitive nature of the sector.

In addition to efficacy and safety, optimizing a product’s manufacturing process can be a key differentiator among competitors. Furthermore, post-approval commercial success can also be impacted by manufacturing issues. For example, Novartis has been able to successfully ship its Kymriah product 90% of the time, with the failures attributed to out-of-specification and manufacturing issues. In contrast, Gilead, claimed 97% of manufacturing success for Yescarta.


Historically, biotech companies have been rushing to show clinical data to impress investors. This has been particularly critical to smaller biotech companies with fragile cash positions and a high burn rate. Much of the innovation in cell and gene therapy comes from smaller sized biotech companies, with 90% of the development estimated to come from companies with fewer than 500 employees. The quality and robustness of a company’s manufacturing process is already a crucial factor taken into account by investors to evaluate possible investment options. As the field matures with landmark approvals (Yescarta®, Kymriah®, Luxturna®, Zynteglo™, Tecartus™)and late-stage pipelines, investors are bound to pay even more attention to manufacturing processes when evaluating the commercial viability of a product. Clinical data alone is not enough to guarantee commercial success.


Despite and maybe because of shortened development timelines, the FDA is determined to scrutinize manufacturing process, including as a pre-requisite for approval. In May 2020, the FDA sent a strong message in this regard by refusing to review a BLA submission by BMS and Bluebird Bio for idecabtagene vicleucel (ide-cel; bb2121). BMS announced that the regulatory agency had raised concerns regarding the manufacturing component rather than clinical/non-clinical data. In August 2020, in another widely publicized example, the FDA questioned whether Mesoblast’s manufacturing process allows for the consistent production of “lots of acceptable quality” for remestemcel-L, mesenchymal stromal cells (MSC)-based therapy indicated to treat pediatric patients with steroid-refractory acute graft-vs-host disease (SR-aGVHD).

These four drivers require the strategic imperative for therapeutic developers to focus on the quality of their process as early as possible in the development of their product, to maximize potential commercial success. By developing a robust and reproducible process early on, companies also avoid expensive and time-consuming comparability and bridging studies, which would be needed if they were to change the process at a later stage of development. Process development is the most critical element during the entire race of drug development and commercialization, affecting both clinical and business outcomes. As the industry matures, the speed to successful commercialization inevitably trumps the speed to market. The race to success in cell and gene therapy is a marathon, not a sprint. And how you start matters.

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