The most common side effects include increased creatinine, diarrhea-colitis, fatigue, nausea, neutropenia, transaminase elevation, musculoskeletal pain, anemia, thrombocytopenia, upper respiratory tract infection, vomiting, abdominal pain, decreased appetite, and rash.[2]
Umbralisib was granted accelerated approval for medical use in the United States in February 2021.[2][6][7] However, due to concerns for increased long term side effects leading to inferior overall survival which led to increased FDA scrutiny in the form of an ODAC review,[8] it has been withdrawn from the US market.[9]
In April 2022, TG Therapeutics announced the voluntary withdrawal of Ukoniq (umbralisib) from sale for its approved use in the treatment of marginal zone lymphoma and follicular lymphoma.[10] Furthermore, the company withdrew the pending Biologics License Application (BLA) and supplemental New Drug Application (sNDA) for the treatment of chronic lymphocytic leukemia (CLL) and small lymphocytic leukemia (SLL) which utilized umbralisib in tandem with ublituximab, known as the "U2" regimen. The decision was based on the overall survival (OS) data from the phase III trial, Unity-CLL, that illustrated and increasing imbalance in OS.
Umbralisib is indicated for adults with relapsed or refractory marginal zone lymphoma (MZL) who have received at least one prior anti-CD20-based regimen; and adults with relapsed or refractory follicular lymphoma (FL) who have received at least three prior lines of systemic therapy.[1][2][3][10]
The prescribing information provides warnings and precautions for adverse reactions including infections, neutropenia, diarrhea and non-infectious colitis, hepatotoxicity, and severe cutaneous reactions.[2]
FDA approval was based on two single-arm cohorts of an open-label, multi-center, multi-cohort trial, UTX-TGR-205 (NCT02793583), in 69 participants with marginal zone lymphoma (MZL) who received at least one prior therapy, including an anti-CD20 containing regimen, and in 117 participants with follicular lymphoma (FL) after at least two prior systemic therapies.[2] The application for umbralisib was granted priority review for the marginal zone lymphoma (MZL) indication and orphan drug designation for the treatment of MZL and follicular lymphoma (FL).[2][18][19][20][21][22]
In June 2022, due to safety concerns, the US Food and Drug Administration (FDA) withdrew its approval for Ukoniq (umbralisib).[3]
Updated findings from the UNITY-CLL clinical trial show a possible increased risk of death in people receiving Ukoniq.[3] As a result, the FDA determined the risks of treatment with Ukoniq outweigh its benefits.[3] Based upon this determination, the drug's manufacturer, TG Therapeutics, announced it was voluntarily withdrawing Ukoniq from the market for the approved uses in MZL and FL.[3][10]
^Clinical trial number NCT02268851 for "A Phase I/Ib Safety and Efficacy Study of the PI3K-delta Inhibitor TGR-1202 and Ibrutinib in Patients With CLL or MCL" at ClinicalTrials.gov
^Clinical trial number NCT02793583 for "Study to Assess the Efficacy and Safety of Ublituximab + TGR-1202 With or Without Bendamustine and TGR-1202 Alone in Patients With Previously Treated Non-Hodgkin's Lymphoma (UNITY-NHL)" at ClinicalTrials.gov