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Priothera closes €30 million Series A financing to develop highly promising therapies for acute myeloid leukemia (AML)

Financing to advance mocravimod, a modulator of sphingosine 1 phosphate (S1P) receptors, and potential best-in-class therapy for AML patients

DUBLIN, Ireland –  12th October 2020Priothera Limited, a clinical stage company developing orally applied sphingosine 1 phosphate (S1P) receptor modulators for haematological malignancies, today announced that it  has successfully closed a Series A financing round of €30 million led by Fountain Healthcare Partners with participation from co-lead investor HealthCap and funds managed by Tekla Capital  Management, LLC as well as EarlyBird Venture Capital.

Priothera will use the funds to progress the clinical development of mocravimod, a modulator of sphingosine 1 phosphate (S1P) receptors, to enhance the curative potential of allogenic hematopoietic stem cell transplantation (HSCT) for treating AML. Priothera expects to generate further randomized clinical data in high risk AML patients with this Series A funding round.

Mocravimod has already been extensively tested in multiple immunologic indications and has shown survival benefit in an early clinical study evaluating acute myeloid leukemia (AML) and acute lymphocytic leukemia (ALL) patients undergoing hematopoietic stem cell transplantation (HSCT).  Priothera acquired mocravimod from KYORIN Pharmaceutical Co., Ltd.

Following the closing of the financing, Florent Gros (Priothera’s Co-Founder and CEO), Dr. Dhaval Patel (Priothera’s Co-Founder and CSO at UCB), Dr. Manus Rogan (Fountain Healthcare Partners Co-Founder and Managing Director), Dr. Mårten Steen (Partner at HealthCap), Dr. Henry Skinner (Senior Vice President at Tekla Capital Management, LLC) and Lionel Carnot (Partner at EarlyBird Venture Capital), have joined the Board of Directors.


Florent Gros, Co-Founder and CEO of Priothera, commented, “We are delighted to welcome this terrific syndicate of investors, who share our passion, commitment, and vision for advancing Priothera’s potentially best-in-class new therapy, mocravimod, in patients with acute myeloid leukemia and other hematologic malignancies. Allogenic stem cell transplant is the only potentially curative approach for AML patients, but has unacceptably high mortality with current treatments.  We are excited about mocravimod which has a unique mechanism of action and clinical proof of concept demonstrating its ability to improve survival outcomes for this devastating disease.”

Dr. Dhaval Patel, Co-Founder and Board Director of Priothera, who previously led Research Europe and the Autoimmunity, Transplantation and Inflammation Disease Area at Novartis, known for its success in developing other S1P receptor modulators, stated, “Mocravimod is an outstanding, well-characterized and well-behaved S1P receptor modulator that is well-suited for clinical development and commercial manufacturing. Based on the clinical results to date, mocravimod has the potential to be a best-in-class therapy to decrease the morbidity and mortality associated with HSCT for AML. I have high hopes that Priothera can make an impactful difference for these patients.”

Commenting on the launch of the company, Dr. Manus Rogan, Chairman of Priothera  added, “The Priothera team has identified and validated a novel commercial opportunity for an S1P receptor modulator allowing the company to complete this significant Series A funding round. With their extensive expertise and capabilities I am confident that Florent and the team are uniquely placed to successfully generate futher clinical data to highlight the significant potential of  mocravimod.


Priothera is leading the way in developing orally applied sphingosine 1 phosphate (S1P) receptor modulators for haematological malignancies. S1P receptor modulators have been suggested to largely reduce egress of T cell subsets from lymphatic tissues allowing for dual inhibition of graft-versus-host-disease (GvHD) and enhancing graft-versus-leukemia benefits in patients receiving allogenic stem cell transplant.

Headquartered in Dublin, Ireland, Priothera was founded in 2020 by Drs. Florent Gros and Dhaval Patel. Joining the founding team are the experienced industry executive, Dr. Christoph Bucher, Dr Simone Seiter, and Brice Suire.

Founding investors are Fountain Healthcare Partners (Dublin, Ireland), funds managed by Tekla Capital  Management, LLC (Boston, Massachusetts), HealthCap (Stockholm, Sweden) and EarlyBird Venture Capital (Berlin, Germany).

KYORIN Pharmaceutical Co., Ltd.

Trusted among patients and professionals in the medical industry, KYORIN Pharmaceutical strives to be a company that contributes to public health and is recognized as a key player with social significance, by improving its presence in specific therapeutic areas through global discovery programs of novel drugs.  KYORIN Pharmaceutical uses a franchise customer strategy where its marketing efforts are focused on respiratory, otolaryngology and urology indications.  In drug discovery, Kyorin is deploying ‘selection and concentration’ approach and is promoting activities aimed at identifying first-in-class drug candidates. Actively searching for and introducing external drug discovery themes as well as multi-tiered program development are at the center of Kyorin’s effforts.

Fountain Healthcare Partners

Fountain Healthcare Partners is a life science focused venture capital fund with EUR 300 million (USD 354 million) under management. Within the life science sector, specific areas of interest to Fountain include specialty pharma, medical devices, biotechnology and diagnostics. The firm deploys the majority of its capital in Europe, with the balance in the United States. Fountain’s main office is in Dublin, Ireland, with a second office in New York.


HealthCap is a family of venture capital funds investing globally in life sciences. With more than EUR 1 billion raised since the start in 1996, HealthCap is one of the largest specialized providers of venture capital within life sciences in Europe. The investment strategy focuses on diseases with high-unmet medical needs and breakthrough therapies that have the potential to be transformative and change medical practice, and the lives of patients suffering these conditions. Over the years HealthCap has backed and built more than 100 companies, taken more than 40 companies public and done numerous trade sales.


Tekla Capital Management LLC is a registered investment adviser based in Boston, Massachusetts and is the investment adviser for four closed-end funds, Tekla Healthcare Investors, Tekla Life Sciences Investors, Tekla Healthcare Opportunities Fund and Tekla World Healthcare Fund. The Funds predominately invest in the securities of public and private healthcare companies.


Earlybird is a venture capital investor focused on European technology companies. Founded in 1997, Earlybird invests in all growth and development phases of a company. Amongst the most experienced venture investors in Europe, Earlybird offers its portfolio companies not only financial resources, but also strategic and operational support as well as access to an international network and capital markets. Earlybird manages separate funds focussing on digital technologies in Eastern and Western Europe as well as healthcare across Europe. With over EUR 1 billion under management, seven IPOs and 24 trade sales, Earlybird is one of the most successful venture capital firms in Europe.


Florent Gros, CEO
E :

Citigate Dewe Rogerson
Sylvie Berrebi, David Dible, Frazer Hall
T: +44 (0)7714 306525

Source: Priothera