On June 5, 2025 Tempest Therapeutics, Inc. (Nasdaq: TPST), a clinical-stage biotechnology company with a pipeline of first-in-class1 targeted and immune-mediated therapeutics to fight cancer, reported that the European Medicines Agency (EMA) has granted Orphan Drug Designation (ODD) to amezalpat (TPST-1120), an oral, small molecule, selective PPAR⍺ antagonist for the treatment of patients with hepatocellular carcinoma (HCC) (Press release, Tempest Therapeutics, JUN 5, 2025, View Source [SID1234653742]).
Schedule your 30 min Free 1stOncology Demo!
Discover why more than 1,500 members use 1stOncology™ to excel in:
Early/Late Stage Pipeline Development - Target Scouting - Clinical Biomarkers - Indication Selection & Expansion - BD&L Contacts - Conference Reports - Combinatorial Drug Settings - Companion Diagnostics - Drug Repositioning - First-in-class Analysis - Competitive Analysis - Deals & Licensing
Schedule Your 30 min Free Demo!
"We’re incredibly pleased to receive Orphan Drug Designation from the EMA, building on the momentum of regulatory support we’ve already received from the FDA," said Stephen Brady, president and chief executive officer of Tempest. "These designations reflect the significant unmet need in liver cancer and reinforce our belief in the potential of amezalpat to make a meaningful difference for patients and families affected by this devastating disease."
The company announced earlier this year that the FDA had granted both ODD and Fast Track Designation (FTD) to amezalpat to treat patients with HCC. These three designations follow positive data across multiple key study efficacy and safety endpoints from a global, randomized Phase 1b/2 clinical study evaluating amezalpat plus standard-of-care atezolizumab and bevacizumab versus atezolizumab and bevacizumab alone in the first-line treatment of patients with unresectable or metastatic HCC. Notable positive outcomes of the randomized comparison include a six-month improvement in median overall survival (OS) with a hazard ratio (HR) of 0.65 for patients receiving the amezalpat combination therapy. In addition, a survival benefit from patients receiving amezalpat was preserved in key sub-populations including PD-L1 negative disease, which is consistent with amezalpat’s proposed mechanism of action to target both the tumor cells directly and the patient’s immune system.
About Hepatocellular Carcinoma
HCC is an aggressive cancer with rising mortality and is projected to become the third leading cause of cancer death by 2030.2 Every year, more than 900,000 people worldwide are diagnosed with HCC.3 Incidence and mortality are highest in East Asia and are increasing in parts of Europe and the US.4 In the US, HCC represents the fastest-rising cause of cancer-related death.3
Nine out of ten cases of HCC are caused by chronic liver disease, which includes chronic hepatitis B and C infection, non-alcoholic fatty liver disease (NAFLD), non-alcoholic steatohepatitis (NASH), alcohol-related liver disease (ALD) and cirrhosis resulting from these conditions.5
Even if diagnosed in the early stage, an estimated 70-80% of people with early-stage HCC experience disease recurrence following surgery.6 Early recurrence is associated with poorer prognosis and shorter survival.5,7 Tumor size, number of tumors, and portal vein invasion are associated with an increased risk of recurrence.6
About Amezalpat
Amezalpat is an oral, small molecule, selective PPAR⍺ antagonist. Data suggest that amezalpat treats cancer by targeting tumor cells directly and by modulating immune suppressive cells and angiogenesis in the tumor microenvironment. In a global randomized Phase 1b/2 study of amezalpat in combination with atezolizumab and bevacizumab in first-line patients with advanced HCC, the amezalpat arm showed clinical superiority across multiple study endpoints, including overall survival in both the entire population and key subpopulations, when compared to atezolizumab and bevacizumab alone, the standard of care. These randomized data were supported by additional positive results observed in the Phase 1 clinical trial in patients with heavily pretreated advanced solid tumors, including renal cell carcinoma and cholangiocarcinoma.
About Orphan Drug Designation
Orphan Designation is granted to therapies intended for the treatment, prevention, or diagnosis of life-threatening or chronically debilitating diseases that affect no more than two in 10,000 people in the European Union (EU) and for which no satisfactory therapy is available. The treatment must also provide significant benefit to those affected by the condition. EMA orphan drug designation provides certain benefits, including the potential for 10 years of market exclusivity following regulatory approval in the EU, reduction in regulatory fees and a centralized EU approval process.