LONDON, Jan 4 (Reuters) - Europe's largest privately held biotech company, Germany-based BioNTech, has raised $270 million to support its work in developing personalised immunotherapies for cancer, ahead of an expected eventual stock market flotation.
Overall, the company has brought in close to $950 million since it was founded in 2008 -- taking account of initial seed funding, grants and partnership deals with big drugmakers -- giving it war chest to finance operations well into 2019.
Chief Operating Officer Sean Marett told Reuters the group would go public at some stage, given the capital-intensive nature of its business, although an initial public offering (IPO) was unlikely this year.
"Inevitably, in the end we will IPO just because of the size and the capital demands required by individualised approaches to treatment. You have to invest enormously in manufacturing," he said.
BioNTech hit the headlines in July when its experimental personalised cancer vaccine, tailored to the tumours of individual patients, kept disease in check in an early-stage clinical trial.
The approach offers a way to widen the use of a new generation of immunotherapy drugs from the likes of Merck & Co , Bristol-Myers Squibb and Roche that currently only work for a limited number of patients.
By adding a personalised cancer vaccine, scientists believe it should be possible to improve substantially the effectiveness of such immune-boosting medicines.
BioNTech has already signed a $310 million deal with Roche allowing the Swiss drugmaker to test the vaccine with its marketed immunotherapy drug Tecentriq.
The individualised vaccine uses so-called messenger RNA to carry code for making mutated proteins that are specific to a patient's tumour, prompting specialist T-cells to step up their attack on cancer cells.
BioNTech, which has around 700 employees at sites in Germany -- more than any other unlisted biotech firm in Europe -- is also working on other cancer-fighting technologies, including antibodies, cell therapies and small molecules.
In addition to the deal with Roche's Genentech unit, it has corporate partnerships with Eli Lilly, Sanofi, Genmab and Bayer Animal Health.
Mainz-based BioNTech has yet to make a profit and has been bankrolled for the past decade by majority owners Thomas and Andreas Struengmann, who sold their generic drugs business Hexal to Novartis in 2005.
The latest Series A financing, announced on Thursday, includes a fresh commitment by the Struengmanns, alongside investments from Redmile Group, Janus Henderson Investors, Invus, Fidelity and other European family offices. (Reporting by Ben Hirschler. Editing by Jane Merriman)