212PB-DOTAMTATE is the first targeted alpha therapy to receive a breakthrough therapy designation in this intent-to-treat population.
The FDA has granted breakthrough therapy designation to 212PB-DOTAMTATE for the treatment of patients with inoperable or metastatic, progressive SSTR-expressing GEP-NETs who have not received treatment with a peptide receptor radionuclide therapy (PPRT).1
The breakthrough therapy designation is designed to expedite development and review of agents targeting serious conditions where early data demonstrates a potential improvement over existing therapies.
“The FDA's breakthrough therapy designation underscores [212PB-DOTAMTATE’s] potential as an innovative treatment that could redefine how patients with neurendocrine tumors are treated. We believe that [212PB-DOTAMTATE] has potential to demonstrate substantial benefit over currently FDA approved PRRT with beta-particle emitters for patients with metastatic or inoperable SSTR-expressing GEP-NETs,” said Ebrahim Delpassand, MD, chairman and chief executive officer of RadioMedix, in a press release.
The designation of 212PB-DOTAMTATE, an SSTR-targeting peptide complete radiolabeled with lead-212 generating alpha particles, is supported by phase 1 and ongoing phase 2 clinical trials (NCT05153772).
In the phase 1 study, 212PB-DOTAMTATE delivered an ORR of 62.5% for PRRT- and lutetium Lu 177 dotatate (Lutathera)-naive patients. Topline data from the phase 2 trial is expected in mid-2024; however, investigators note that the target response rate has already been achieved.
“The FDA's decision is a great news for patients suffering from this illness, and an important milestone to expedite the development of this new therapy,” added Delpassand, in the press release.
The study has an estimated enrollment of 68 patients who are aged 18 or older with confirmed SSTR receptors on all lesions and have progressive disease following somatostatin analog treatment.2 Patients who are PRRT-naive should have documented disease progression within 12 months of study enrollment. Patients must have an ECOG performance status of 0 to 2, a life expectancy of at least 12 weeks, and adequate bone marrow capacity and organ function within 3 weeks of treatment initiation.
Patients are not eligible to enroll if they have received regional hepatic radionuclide therapy within 4 months of study enrollment, nonradioactive hepatic therapy within 6 months of study enrollment, a known hypersensitivity to the study agents, a history of myelodysplastic syndrome, uncontrolled congestive heart failure, or uncontrolled diabetes mellitus.
The primary end points are ORR and incidence of treatment-related adverse events. Secondary end points include median progression-free survival, overall survival, time to tumor progression, and health-related quality of life.