R-289 is under clinical development by Rigel Pharmaceuticals and currently in Phase II for Myelodysplastic Syndrome. According to GlobalData, Phase II drugs for Myelodysplastic Syndrome have a 30% phase transition success rate (PTSR) indication benchmark for progressing into Phase III. GlobalData’s report assesses how R-289’s drug-specific PTSR and Likelihood of Approval (LoA) scores compare to the indication benchmarks. Buy the report here.

GlobalData tracks drug-specific phase transition and likelihood of approval scores, in addition to indication benchmarks based off 18 years of historical drug development data. Attributes of the drug, company and its clinical trials play a fundamental role in drug-specific PTSR and likelihood of approval.

R-289 overview

R-289 is under development for myelodysplastic syndrome. It is administered orally. The drug candidate acts by targeting interleukin 1 receptor associated kinase 1 (IRAK1) and interleukin 1 receptor associated kinase 4 (IRAK4).

Rigel Pharmaceuticals overview

Rigel Pharmaceuticals (Rigel), is a biotechnology company that discovers and develops innovative small-molecule drugs for patients with immune disorders, hematological disorders, cancer and rare diseases. Its research activities focus on signaling pathways that are critical to disease mechanisms. The company’s lead product, the US FDA-approved Tavalisse (fostamatinib disodium hexahydrate), is an oral spleen tyrosine kinase inhibitor to treat adult patients with chronic immune thrombocytopenia. Rigel is also evaluating Fostamatinib for autoimmune hemolytic anemia and IgA nephropathy in Phase II trials. The company has partnered clinical programs with Aclaris, BerGenBio, Daiichi, AstraZeneca, Kissei, Grifols, Merck and Novartis. Rigel is headquartered in South San Francisco, California, the US.

For a complete picture of R-289’s drug-specific PTSR and LoA scores, buy the report here.


GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData’s Likelihood of Approval analytics tool dynamically assesses and predicts how likely a drug will move to the next stage in its clinical pathway (PTSR), as well as how likely the drug will be approved (LoA). This is based on a proprietary algorithm built from the drugs’ sales forecast, regulatory milestones, cost forecasts, WACC rate and other proprietary data sources found on GlobalData’s Pharmaceutical Intelligence Center.