The U.S. Food and Drug Administration (FDA) granted Fast Track designation for PD-0325901, an investigational, oral, small molecule inhibitor of MEK1 and MEK2, for the treatment of patients 2 years of age or older with neurofibromatosis type 1-associated inoperable plexiform neurofibromas that are progressing or causing significant morbidity.

Neurofibromatosis type 1-associated plexiform neurofibromas (NF1-PN) is a rare genetic disorder characterized by mutations in the MAPK pathway, leading to the growth of peripheral nerve sheath tumors that cause significant pain, disfigurement and morbidity. NF1-PNs are most often diagnosed in the first two decades of life and are characterized by aggressive tumor growth, which is typically more rapid during childhood.1-3 There are currently no therapies approved for the treatment of NF1-PN.

“The Fast Track designation recognizes that plexiform neurofibromas have a substantial impact on the lives of patients, and that our MEK inhibitor has the potential to address the significant needs faced by this patient community who currently do not have an FDA-approved treatment,” said Saqib Islam, Chief Executive Officer of SpringWorks Therapeutics. “We look forward to continuing to work closely with the FDA on our upcoming Phase 2b study, which will enroll pediatric and adult NF1 patients with plexiform neurofibromas.”

The FDA’s Fast Track program is designed to expedite the development and review of drugs with the potential to treat serious or life-threatening conditions, and with nonclinical or clinical data that demonstrate the potential to address unmet medical needs. Fast Track designation enables a company to have frequent communication with the FDA throughout the drug development and review process.4

In November 2018, the FDA granted Orphan Drug designation for PD-0325901 for the treatment of neurofibromatosis type 1. SpringWorks expects to initiate a Phase 2b single-arm, open-label study of PD-0325901 in pediatric and adult patients with NF1-PN in the third quarter of 2019.

About Neurofibromatosis Type 1
Neurofibromatosis type 1 (NF1) is a rare genetic disorder that is caused by mutations in the NF1 gene, and that affects both children and adults. Throughout their lifetime, about 30 to 50 percent of NF1 patients progress to a more severe form of the disease that results in the development of plexiform neurofibromas (PN), which are progressive peripheral nerve sheath tumors that cause severe pain, disfigurement, debilitating loss of range of motion, and can significantly shorten lifespan.1-3The clinical course of NF1-PN is heterogeneous with varying manifestations and severity across patients.

It is estimated that NF1 affects 1 in 3,000 individuals worldwide, and that there are approximately 100,000 patients in the United States living with this disease.5 Most patients with NF1-PN are treated with surgical removal of the tumors, sometimes requiring amputation; however, surgery has variable success rates and a high rate of recurrence has been observed because of the aggressive nature of these tumors.6 There are no therapies currently approved for the treatment of NF1-PN.

The SpringWorks Therapeutics press release can be found here.

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