Exelixis Provides Regulatory Update Related to Supplemental New Drug Application for Cabozantinib (CABOMETYX®) for the Treatment of Patients with Previously Treated Advanced Neuroendocrine Tumors
As announced in August 2023, the Alliance for Clinical Trials in Oncology independent Data and Safety Monitoring Board unanimously recommended that enrollment in the CABINET trial be stopped and randomized patients be unblinded to therapy with the allowance for crossover from placebo to cabozantinib due to the substantial improvement in progression-free survival (PFS) observed at this interim analysis. Final results from the enrolled patient population, which were presented at the 2024 European Society of Medical Oncology Congress and published concurrently in the New England Journal of Medicine, confirmed statistically significant and clinically meaningful improvements with cabozantinib versus placebo in the primary endpoint of PFS by blinded independent central review. Additional analyses supported consistency of benefit across all clinical subgroups examined, including primary tumor site, grade and prior systemic anticancer therapy.
ODACs review and evaluate data regarding the safety and effectiveness of marketed and investigational human drug products for use in the treatment of cancer and make recommendations to the Commissioner of Food and Drugs. More general information about ODAC reviews can be found on the FDA website, here. The planned ODAC meeting is not related to the current approved indications for CABOMETYX in the
About CABINET (Alliance A021602)
CABINET (Randomized, Double-Blinded Phase III Study of CABozantinib versus Placebo In Patients with Advanced NEuroendocrine Tumors After Progression on Prior Therapy) is sponsored by the National Cancer Institute (NCI), part of the National Institutes of Health, and is being led and conducted by the NCI-funded Alliance for Clinical Trials in Oncology with participation from the NCI-funded National Clinical Trials Network as part of Exelixis’ collaboration through a Cooperative Research and Development Agreement with the NCI’s Cancer Therapy Evaluation Program.
CABINET is a multicenter, randomized, double-blinded, placebo-controlled phase 3 pivotal trial that had enrolled a total of 298 patients in the
About Neuroendocrine Tumors (NET)
NET are cancers that begin in the specialized cells of the body’s neuroendocrine system.1 These cells have traits of both hormone-producing endocrine cells and nerve cells.1 In the
NET can develop in any part of the body, but most commonly start in the GI tract or in the lungs, where they have historically been referred to as carcinoid tumors and are more recently called epNET.1 The five-year survival rates for advanced GI and lung NET tumors are
About CABOMETYX® (cabozantinib)
In the
CABOMETYX is not indicated as a treatment for NET.
IMPORTANT SAFETY INFORMATION
WARNINGS AND PRECAUTIONS
Hemorrhage: Severe and fatal hemorrhages occurred with CABOMETYX. The incidence of Grade 3 to 5 hemorrhagic events was
Perforations and Fistulas: Fistulas, including fatal cases, occurred in
Thrombotic Events: CABOMETYX increased the risk of thrombotic events. Venous thromboembolism occurred in
Hypertension and Hypertensive Crisis: CABOMETYX can cause hypertension, including hypertensive crisis. Hypertension was reported in
Diarrhea: Diarrhea occurred in
Palmar-Plantar Erythrodysesthesia (PPE): PPE occurred in
Hepatotoxicity: CABOMETYX in combination with nivolumab can cause hepatic toxicity with higher frequencies of Grades 3 and 4 ALT and AST elevations compared to CABOMETYX alone.
Monitor liver enzymes before initiation of and periodically throughout treatment. Consider more frequent monitoring of liver enzymes than when the drugs are administered as single agents. For elevated liver enzymes, interrupt CABOMETYX and nivolumab and consider administering corticosteroids.
With the combination of CABOMETYX and nivolumab, Grades 3 and 4 increased ALT or AST were seen in
Adrenal Insufficiency: CABOMETYX in combination with nivolumab can cause primary or secondary adrenal insufficiency. For Grade 2 or higher adrenal insufficiency, initiate symptomatic treatment, including hormone replacement as clinically indicated. Withhold CABOMETYX and/or nivolumab and resume CABOMETYX at a reduced dose depending on severity.
Adrenal insufficiency occurred in
Approximately
Proteinuria: Proteinuria was observed in
Osteonecrosis of the Jaw (ONJ): ONJ occurred in <
Impaired Wound Healing: Wound complications occurred with CABOMETYX. Withhold CABOMETYX for at least 3 weeks prior to elective surgery. Do not administer CABOMETYX for at least 2 weeks after major surgery and until adequate wound healing. The safety of resumption of CABOMETYX after resolution of wound healing complications has not been established.
Reversible Posterior Leukoencephalopathy Syndrome (RPLS): RPLS, a syndrome of subcortical vasogenic edema diagnosed by characteristic findings on MRI, can occur with CABOMETYX. Evaluate for RPLS in patients presenting with seizures, headache, visual disturbances, confusion, or altered mental function. Discontinue CABOMETYX in patients who develop RPLS.
Thyroid Dysfunction: Thyroid dysfunction, primarily hypothyroidism, has been observed with CABOMETYX. Based on the safety population, thyroid dysfunction occurred in
Patients should be assessed for signs of thyroid dysfunction prior to the initiation of CABOMETYX and monitored for signs and symptoms of thyroid dysfunction during CABOMETYX treatment. Thyroid function testing and management of dysfunction should be performed as clinically indicated.
Hypocalcemia: CABOMETYX can cause hypocalcemia. Based on the safety population, hypocalcemia occurred in
In COSMIC-311, hypocalcemia occurred in
Monitor blood calcium levels and replace calcium as necessary during treatment. Withhold and resume at reduced dose upon recovery or permanently discontinue CABOMETYX depending on severity.
Embryo-Fetal Toxicity: CABOMETYX can cause fetal harm. Advise pregnant women and females of reproductive potential of the potential risk to a fetus. Verify the pregnancy status of females of reproductive potential prior to initiating CABOMETYX and advise them to use effective contraception during treatment and for 4 months after the last dose.
ADVERSE REACTIONS
The most common (≥
CABOMETYX as a single agent: diarrhea, fatigue, PPE, decreased appetite, hypertension, nausea, vomiting, weight decreased, and constipation.
CABOMETYX in combination with nivolumab: diarrhea, fatigue, hepatotoxicity, PPE, stomatitis, rash, hypertension, hypothyroidism, musculoskeletal pain, decreased appetite, nausea, dysgeusia, abdominal pain, cough, and upper respiratory tract infection.
DRUG INTERACTIONS
Strong CYP3A4 Inhibitors: If coadministration with strong CYP3A4 inhibitors cannot be avoided, reduce the CABOMETYX dosage. Avoid grapefruit or grapefruit juice.
Strong CYP3A4 Inducers: If coadministration with strong CYP3A4 inducers cannot be avoided, increase the CABOMETYX dosage. Avoid St. John’s wort.
USE IN SPECIFIC POPULATIONS
Lactation: Advise women not to breastfeed during CABOMETYX treatment and for 4 months after the final dose.
Hepatic Impairment: In patients with moderate hepatic impairment, reduce the CABOMETYX dosage. Avoid CABOMETYX in patients with severe hepatic impairment.
Please see accompanying full Prescribing Information
https://www.cabometyx.com/downloads/CABOMETYXUSPI.pdf.
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit http://www.fda.gov/medwatch or call 1-800-FDA-1088.
About Exelixis
Exelixis is a globally ambitious oncology company innovating next-generation medicines and regimens at the forefront of cancer care. Powered by drug discovery and development excellence, we are rapidly evolving our product portfolio to target an expanding range of tumor types and indications with our clinically differentiated pipeline of small molecules, antibody-drug conjugates and other biotherapeutics. This comprehensive approach harnesses decades of robust investment in our science and partnerships to advance our investigational programs and extend the impact of our flagship commercial product, CABOMETYX® (cabozantinib). Exelixis is driven by a bold scientific pursuit to create transformational treatments that give more patients hope for the future. For information about the company and its mission to help cancer patients recover stronger and live longer, visit www.exelixis.com, follow @ExelixisInc on X (Twitter), like Exelixis, Inc. on Facebook and follow Exelixis on LinkedIn.
Exelixis Forward-Looking Statements
This press release contains forward-looking statements, including, without limitation, statements related to: the FDA’s plans to discuss the sNDA for cabozantinib for the treatment of adults with previously treated advanced pNET and advanced epNET at an ODAC meeting in March 2025; the therapeutic potential of cabozantinib as a treatment for patients with previously treated advanced pNET and advanced epNET; the regulatory review process with respect to Exelixis’ sNDA for cabozantinib in previously treated advanced pNET and advanced epNET, including the Prescription Drug User Fee Act target action date assigned by the FDA; and Exelixis’ scientific pursuit to create transformational treatments that give patients more hope for the future. Any statements that refer to expectations, projections or other characterizations of future events or circumstances are forward-looking statements and are based upon Exelixis’ current plans, assumptions, beliefs, expectations, estimates and projections. Forward-looking statements involve risks and uncertainties. Actual results and the timing of events could differ materially from those anticipated in the forward-looking statements as a result of these risks and uncertainties, which include, without limitation: complexities and the unpredictability of the regulatory review and approval processes in the
Exelixis, the Exelixis logo and CABOMETYX are registered
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1 Neuroendocrine Tumors. Cleveland Clinic website. Available at: https://my.clevelandclinic.org/health/diseases/22006-neuroendocrine-tumors-net. Accessed November 2024.
2 Population Estimate: Unresectable, Locally Advanced or Metastatic Extra-Pancreatic NET. June 2024 (internal data on file).
3 Pathak, S., Starr, J.S., Halfdanarson T., et al. Understanding the increasing incidence of neuroendocrine tumors. Expert Rev Endocrinol Metab. September 2023;18(5):377-385.
4 Pancreatic Neuroendocrine Tumors (Islet Cell Tumors) Treatment (PDQ®)–Patient Version. NCI website. Available at: https://www.cancer.gov/types/pancreatic/patient/pnet-treatment-pdq. Accessed November 2024.
5 What Is a Pancreatic Neuroendocrine Tumor? ACS website. Available at: https://www.cancer.org/cancer/types/pancreatic-neuroendocrine-tumor/about/what-is-pnet.html. Accessed November 2024.
6 McClellan, K., Chen. E.Y, Kardosh A., et al. Therapy Resistant Gastroenteropancreatic Neuroendocrine Tumors. Cancers. 2022, 14(19), 4769.
7 What is a Gastrointestinal Carcinoid Tumor? ACS website. Available at: https://www.cancer.org/cancer/types/gastrointestinal-carcinoid-tumor/about/what-is-gastrointestinal-carcinoid.html. Accessed November 2024.
8 Survival Rates for Gastrointestinal Carcinoid Tumors. ACS website. Available at: https://www.cancer.org/cancer/types/gastrointestinal-carcinoid-tumor/detection-diagnosis-staging/survival-rates.html. Accessed November 2024.
9 Survival Rates for Lung Carcinoid Tumors. ACS website. Available at: https://www.cancer.org/cancer/types/lung-carcinoid-tumor/detection-diagnosis-staging/survival-rates.html. Accessed November 2024.
10 Survival Rates for Pancreatic Neuroendocrine Tumor. ACS website. Available at: https://www.cancer.org/cancer/types/pancreatic-neuroendocrine-tumor/detection-diagnosis-staging/survival-rates.html. Accessed November 2024.
11 Neuroendocrine Tumor (NET). NCI website. Available at: https://www.cancer.gov/pediatric-adult-rare-tumor/rare-tumors/rare-endocrine-tumor/carcinoid-tumor. Accessed November 2024.
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Exelixis, Inc.
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Source: Exelixis, Inc.