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Exelixis Presents Final Overall Survival Results from Phase 3 CONTACT-02 Pivotal Study Evaluating Cabozantinib in Combination with an Immune Checkpoint Inhibitor in Metastatic Castration-Resistant Prostate Cancer at ESMO 2024

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Exelixis (EXEL) presented final overall survival (OS) results from the CONTACT-02 phase 3 study evaluating cabozantinib (CABOMETYX®) with atezolizumab in metastatic castration-resistant prostate cancer (mCRPC) at ESMO 2024. The study showed a numerical but not statistically significant improvement in OS favoring the combination (HR: 0.89; P=0.296). Notably, improved OS was observed in patients with bone or liver metastases. The combination demonstrated a manageable safety profile with treatment-related grade 3-4 adverse events occurring in 40% of patients. Exelixis plans to submit a supplemental New Drug Application for this combination in mCRPC later this year, based on the previously reported statistically significant progression-free survival benefit.

Exelixis (EXEL) ha presentato i risultati finali della sopravvivenza globale (OS) dallo studio di fase 3 CONTACT-02 che valuta il cabozantinib (CABOMETYX®) in combinazione con l'atezolizumab nel carcinoma prostatico metastatico resistente alla castrazione (mCRPC) durante l'ESMO 2024. Lo studio ha mostrato un miglioramento numerico ma non statisticamente significativo nella OS a favore della combinazione (HR: 0.89; P=0.296). È importante notare che è stata osservata una OS migliorata nei pazienti con metastasi ossee o epatiche. La combinazione ha evidenziato un profilo di sicurezza gestibile, con eventi avversi di grado 3-4 legati al trattamento che si sono verificati nel 40% dei pazienti. Exelixis prevede di presentare una domanda di registrazione farmacologica supplementare per questa combinazione nel mCRPC entro la fine dell'anno, sulla base del precedentemente riportato significativo beneficio di sopravvivenza libera da progressione.

Exelixis (EXEL) presentó los resultados finales de supervivencia global (OS) del estudio de fase 3 CONTACT-02 que evalúa cabozantinib (CABOMETYX®) junto con atezolizumab en cáncer de próstata metastásico resistente a la castración (mCRPC) en el ESMO 2024. El estudio mostró una mejora numérica pero no estadísticamente significativa en OS a favor de la combinación (HR: 0.89; P=0.296). Es notable que se observó una OS mejorada en pacientes con metástasis óseas o hepáticas. La combinación demostró un perfil de seguridad manejable con eventos adversos relacionados con el tratamiento de grado 3-4 que ocurrieron en el 40% de los pacientes. Exelixis planea presentar una solicitud de aplicación de nuevo fármaco suplementaria para esta combinación en mCRPC más adelante este año, basado en el previamente reportado beneficio estadísticamente significativo de supervivencia libre de progresión.

Exelixis (EXEL)는 ESMO 2024에서 전이성 거세 저항성 전립선 암(mCRPC)에서 카보잔티닙(CABOMETYX®)과 아테졸리주맙의 병용 요법을 평가한 CONTACT-02 3상 연구의 최종 전체 생존(OS) 결과를 발표했습니다. 이 연구는 병용 요법이 통계적으로 유의미하지는 않지만 OS에서 수치적으로 개선된 결과를 보였음을 보여주었습니다(HR: 0.89; P=0.296). 특히 뼈 또는 간 전이가 있는 환자에서 개선된 OS가 관찰되었습니다. 이 병용 요법은 관리 가능한 안전성 프로필을 나타냈으며, 치료와 관련된 3-4등급의 부작용이 환자의 40%에서 발생했습니다. Exelixis는 이 조합에 대한 보완 신약 신청서를 올해 말에 mCRPC에 제출할 계획이며, 이는 이전에 보고된 통계적으로 유의미한 무진행 생존 이점을 기반으로 합니다.

Exelixis (EXEL) a présenté les résultats finaux de la survie globale (OS) de la étude de phase 3 CONTACT-02 évaluant le cabozantinib (CABOMETYX®) avec l'atezolizumab dans le cancer de la prostate métastatique résistant à la castration (mCRPC) lors de l'ESMO 2024. L'étude a montré une amélioration numérique mais non statistiquement significative de l'OS en faveur de la combinaison (HR : 0,89 ; P=0,296). Il est à noter que une OS améliorée a été observée chez les patients ayant des métastases osseuses ou hépatiques. La combinaison a montré un profil de sécurité gérable, avec des événements indésirables de grade 3-4 liés au traitement survenant chez 40 % des patients. Exelixis prévoit de soumettre une demande d'autorisation de mise sur le marché de médicament complémentaire pour cette combinaison dans le mCRPC plus tard cette année, sur la base du bénéfice de survie sans progression statistiquement significatif précédemment signalé.

Exelixis (EXEL) hat die endgültigen Ergebnisse zur Gesamtüberlebensrate (OS) aus der 3-phasigen CONTACT-02-Studie präsentiert, die Cabozantinib (CABOMETYX®) zusammen mit Atezolizumab bei metastasiertem kastrationsresistentem Prostatakrebs (mCRPC) auf der ESMO 2024 bewertet. Die Studie zeigte eine numerische, jedoch nicht statistisch signifikante Verbesserung der OS zugunsten der Kombination (HR: 0,89; P=0,296). Bemerkenswert ist, dass eine verbesserte OS bei Patienten mit Knochen- oder Lebermetastasen beobachtet wurde. Die Kombination zeigte ein handhabbares Sicherheitsprofil, wobei behandlungsbedingte Nebenwirkungen der Grade 3-4 bei 40% der Patienten auftraten. Exelixis plant, einen ergänzenden Antrag auf eine neue Arzneimittelzulassung für diese Kombination bei mCRPC noch in diesem Jahr einzureichen, basierend auf dem zuvor berichteten statistisch signifikanten Vorteil der progressionsfreien Überlebenszeit.

Positive
  • Improved overall survival observed in patients with bone or liver metastases
  • Statistically significant benefit in progression-free survival (PFS) in the predefined PFS ITT population
  • Manageable safety profile with similar treatment discontinuation rates to NHT
  • Quality of life not impaired relative to NHT
  • Plans to submit supplemental New Drug Application for cabozantinib with atezolizumab in mCRPC
Negative
  • Overall survival improvement not statistically significant in the intent-to-treat population (HR: 0.89; P=0.296)
  • Higher rate of treatment-related grade 3-4 adverse events (40%) compared to NHT (8%)

The CONTACT-02 study presents mixed results for the combination of cabozantinib and atezolizumab in mCRPC patients. While the trial did not meet its primary OS endpoint (HR: 0.89, P=0.296), it showed promising outcomes in specific subgroups. Notably, patients with liver metastases demonstrated a substantial OS improvement (HR: 0.68, P=0.051), suggesting a potential benefit for this hard-to-treat population. The 40% rate of grade 3-4 adverse events in the combination arm is concerning but not unexpected for this type of therapy. These results indicate a potential niche application rather than a broad treatment shift in mCRPC management.

The study's statistical outcomes warrant careful interpretation. While the overall OS results were not statistically significant, the subgroup analyses reveal important trends. The hazard ratio of 0.68 for liver metastases patients is clinically meaningful, despite narrowly missing statistical significance (P=0.051). This suggests a potential targeted benefit for this subpopulation. However, it's important to note that subgroup analyses are often exploratory and require further validation. The similar quality of life outcomes between arms is a positive finding, indicating that the combination therapy doesn't significantly impact patient well-being compared to NHT.

From a market perspective, these results present a mixed outlook for Exelixis. While the study didn't achieve statistical significance in OS, the positive PFS results and promising subgroup data could support a supplemental New Drug Application. The potential approval for mCRPC patients, especially those with liver metastases, could open a new market segment for cabozantinib. However, competition in the mCRPC space is fierce and the lack of a clear OS benefit may limit broad adoption. The similar discontinuation rates between arms (5% vs 2%) suggest manageable tolerability, which could support real-world use if approved. Investors should closely monitor the FDA's response to the planned submission.

ALAMEDA, Calif.--(BUSINESS WIRE)-- Exelixis, Inc. (Nasdaq: EXEL) today announced detailed final overall survival (OS) results from CONTACT-02, a phase 3 pivotal study evaluating cabozantinib (CABOMETYX®) in combination with atezolizumab (Tecentriq®) compared with a second novel hormonal therapy (NHT) in patients with metastatic castration-resistant prostate cancer (mCRPC) and measurable extra-pelvic soft tissue disease who have progressed on one prior NHT. These data are being presented today at the 2024 European Society for Medical Oncology Congress (ESMO 2024) during the Proffered Paper Session: GU Tumours, Prostate at 2:45 p.m. CEST.

“Despite recent advancements, outcomes remain poor for patients with metastatic castration-resistant prostate cancer whose disease progresses after novel hormonal therapy – particularly those with liver metastases,” said Neeraj Agarwal, M.D., FASCO, Senior Director for Clinical Research at Huntsman Cancer Institute at the University of Utah and the global lead investigator of the trial. “I believe there is a critical need for novel agents with a new mechanism of action that are broadly accessible to patients and can delay disease progression. The positive results from CONTACT-02, especially in the subset of patients with liver metastasis, reinforce the therapeutic potential of cabozantinib in combination with atezolizumab for these patients.”

The two primary endpoints for CONTACT-02 were progression-free survival (PFS) and OS. At a median follow-up of 24.0 months, the final analysis of OS showed a numerical but not statistically significant improvement favoring cabozantinib in combination with atezolizumab (hazard ratio: 0.89; 95% confidence interval: 0.72-1.10; P=0.296). An improvement in OS was observed in multiple clinical subgroups, notably in patients with bone or liver metastases, with the latter category representing a population whose disease may be evolving away from androgen receptor signaling. Additional OS efficacy findings are included in Table 1 below.


TABLE 1

ITT population

Bone metastases

Liver metastases

Patients, n

575

446

132

HR
(95% CI)
P-value

0.89

(0.72, 1.10)

P=0.30

0.79

(0.63, 1.00)

P=0.046

0.68

(0.47, 1.00)

P=0.051

Median OS (C+A); months

14.8

(13.4, 16.7)

13.8

(11.9, 16.3)

12.2

(8.8, 13.8)

Median OS (NHT); months

15.0

(13.0, 18.5)

11.6

(10.5, 14.1)

7.1

(5.3, 10.4)

C+A: cabozantinib + atezolizumab; CI: confidence interval; HR: hazard ratio; ITT: intent-to-treat; NHT: novel hormonal therapy; OS: overall survival

“Within the current treatment landscape, there is a growing population of patients with metastatic castration-resistant prostate cancer with extra-pelvic soft tissue metastases whose disease has progressed after novel hormonal therapy, leaving a high unmet need for effective, widely available treatments for these patients,” said Amy Peterson, M.D., Executive Vice President, Product Development & Medical Affairs, and Chief Medical Officer, Exelixis. “Collectively, the results from the CONTACT-02 trial suggest that there are patients who could benefit from cabozantinib in combination with atezolizumab and that this regimen could be a valuable addition to the treatment landscape for patients with advanced prostate cancer.”

Treatment-related grade 3-4 adverse events (AEs) occurred in 40% of patients receiving cabozantinib in combination with atezolizumab and 8% of those receiving NHT. Treatment-related AEs leading to discontinuation of all treatment components were similar (5% for cabozantinib in combination with atezolizumab and 2% of those receiving NHT). The time to clinically meaningful deterioration in quality of life was similar between arms, and the combination of cabozantinib and atezolizumab did not impair quality of life relative to generally well-tolerated NHT.

As previously announced, CONTACT-02 met one of its two primary endpoints, demonstrating a statistically significant benefit in PFS in the predefined PFS ITT population (i.e., the first 400 randomized patients). Detailed results were presented at the American Society of Clinical Oncology 2024 Genitourinary Cancers Symposium in January 2024. Exelixis intends to submit a supplemental New Drug Application with the U.S. Food and Drug Administration for cabozantinib in combination with atezolizumab for mCRPC later this year.

About CONTACT-02
CONTACT-02 is a global, multicenter, randomized, phase 3, open-label study that randomized 575 patients 1:1 to the experimental arm of cabozantinib in combination with atezolizumab and the control arm of a second NHT (either abiraterone and prednisone or enzalutamide). The two primary endpoints of the trial are PFS and OS. The study included patients with mCRPC who have measurable extra-pelvic soft tissue metastasis and who have progressed on one prior NHT. The secondary endpoint is objective response rate per blinded independent radiology committee. The trial is sponsored by Exelixis and co-funded by Ipsen, Roche and Takeda Pharmaceutical Company Limited (Takeda). Takeda is conducting the trial in Japan. More information about CONTACT-02 is available at ClinicalTrials.gov.

About CRPC
According to the American Cancer Society, approximately 299,000 new cases of prostate cancer will be diagnosed in the U.S., and over 35,000 people will die from the disease in 2024.1 Prostate cancer that has spread beyond the prostate and does not respond to androgen-suppression therapies—a common treatment for prostate cancer—is known as mCRPC.2 Men diagnosed with mCRPC often have a poor prognosis, with an estimated survival of 1-2 years.3,4

About CABOMETYX® (cabozantinib)
In the U.S., CABOMETYX tablets are approved as monotherapy for the treatment of patients with advanced renal cell carcinoma (RCC) and in combination with nivolumab as a first-line treatment for patients with advanced RCC; for the treatment of patients with hepatocellular carcinoma (HCC) who have been previously treated with sorafenib; and for adult and pediatric patients 12 years of age and older with locally advanced or metastatic differentiated thyroid cancer (DTC) that has progressed following prior VEGFR-targeted therapy and who are radioactive iodine-refractory or ineligible. CABOMETYX tablets have also received regulatory approvals in over 65 countries outside the U.S. and Japan, including the European Union. In 2016, Exelixis granted Ipsen Pharma SAS exclusive rights for the commercialization and further clinical development of cabozantinib outside of the U.S. and Japan. In 2017, Exelixis granted exclusive rights to Takeda Pharmaceutical Company Limited for the commercialization and further clinical development of cabozantinib for all future indications in Japan. Exelixis holds the exclusive rights to develop and commercialize cabozantinib in the U.S.

CABOMETYX is not indicated as a treatment for CRPC.

IMPORTANT SAFETY INFORMATION
WARNINGS AND PRECAUTIONS

Hemorrhage: Severe and fatal hemorrhages occurred with CABOMETYX. The incidence of Grade 3 to 5 hemorrhagic events was 5% in CABOMETYX patients in RCC, HCC, and DTC studies. Discontinue CABOMETYX for Grade 3 or 4 hemorrhage and prior to surgery as recommended. Do not administer CABOMETYX to patients who have a recent history of hemorrhage, including hemoptysis, hematemesis, or melena.

Perforations and Fistulas: Fistulas, including fatal cases, occurred in 1% of CABOMETYX patients. Gastrointestinal (GI) perforations, including fatal cases, occurred in 1% of CABOMETYX patients. Monitor patients for signs and symptoms of fistulas and perforations, including abscess and sepsis. Discontinue CABOMETYX in patients who experience a Grade 4 fistula or a GI perforation.

Thrombotic Events: CABOMETYX increased the risk of thrombotic events. Venous thromboembolism occurred in 7% (including 4% pulmonary embolism) and arterial thromboembolism in 2% of CABOMETYX patients. Fatal thrombotic events occurred in CABOMETYX patients. Discontinue CABOMETYX in patients who develop an acute myocardial infarction or serious arterial or venous thromboembolic events that require medical intervention.

Hypertension and Hypertensive Crisis: CABOMETYX can cause hypertension, including hypertensive crisis. Hypertension was reported in 37% (16% Grade 3 and <1% Grade 4) of CABOMETYX patients. Do not initiate CABOMETYX in patients with uncontrolled hypertension. Monitor blood pressure regularly during CABOMETYX treatment. Withhold CABOMETYX for hypertension that is not adequately controlled with medical management; when controlled, resume at a reduced dose. Permanently discontinue CABOMETYX for severe hypertension that cannot be controlled with anti-hypertensive therapy or for hypertensive crisis.

Diarrhea: Diarrhea occurred in 62% of CABOMETYX patients. Grade 3 diarrhea occurred in 10% of CABOMETYX patients. Monitor and manage patients using antidiarrheals as indicated. Withhold CABOMETYX until improvement to ≤ Grade 1, resume at a reduced dose.

Palmar-Plantar Erythrodysesthesia (PPE): PPE occurred in 45% of CABOMETYX patients. Grade 3 PPE occurred in 13% of CABOMETYX patients. Withhold CABOMETYX until improvement to Grade 1 and resume at a reduced dose for intolerable Grade 2 PPE or Grade 3 PPE.

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 11% of patients. ALT or AST >3 times ULN (Grade ≥2) was reported in 83 patients, of whom 23 (28%) received systemic corticosteroids; ALT or AST resolved to Grades 0-1 in 74 (89%). Among the 44 patients with Grade ≥2 increased ALT or AST who were rechallenged with either CABOMETYX (n=9) or nivolumab (n=11) as a single agent or with both (n=24), recurrence of Grade ≥2 increased ALT or AST was observed in 2 patients receiving CABOMETYX, 2 patients receiving nivolumab, and 7 patients receiving both CABOMETYX and nivolumab. Withhold and resume at a reduced dose based on severity.

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 4.7% (15/320) of patients with RCC who received CABOMETYX with nivolumab, including Grade 3 (2.2%), and Grade 2 (1.9%) adverse reactions. Adrenal insufficiency led to permanent discontinuation of CABOMETYX and nivolumab in 0.9% and withholding of CABOMETYX and nivolumab in 2.8% of patients with RCC.

Approximately 80% (12/15) of patients with adrenal insufficiency received hormone replacement therapy, including systemic corticosteroids. Adrenal insufficiency resolved in 27% (n=4) of the 15 patients. Of the 9 patients in whom CABOMETYX with nivolumab was withheld for adrenal insufficiency, 6 reinstated treatment after symptom improvement; of these, all (n=6) received hormone replacement therapy and 2 had recurrence of adrenal insufficiency.

Proteinuria: Proteinuria was observed in 8% of CABOMETYX patients. Monitor urine protein regularly during CABOMETYX treatment. For Grade 2 or 3 proteinuria, withhold CABOMETYX until improvement to ≤ Grade 1 proteinuria; resume CABOMETYX at a reduced dose. Discontinue CABOMETYX in patients who develop nephrotic syndrome.

Osteonecrosis of the Jaw (ONJ): ONJ occurred in <1% of CABOMETYX patients. ONJ can manifest as jaw pain, osteomyelitis, osteitis, bone erosion, tooth or periodontal infection, toothache, gingival ulceration or erosion, persistent jaw pain, or slow healing of the mouth or jaw after dental surgery. Perform an oral examination prior to CABOMETYX initiation and periodically during treatment. Advise patients regarding good oral hygiene practices. Withhold CABOMETYX for at least 3 weeks prior to scheduled dental surgery or invasive dental procedures, if possible. Withhold CABOMETYX for development of ONJ until complete resolution, resume at a reduced dose.

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 19% of patients treated with CABOMETYX, including Grade 3 in 0.4% of patients.

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 13% of patients treated with CABOMETYX, including Grade 3 in 2% and Grade 4 in 1% of patients. Laboratory abnormality data were not collected in CABOSUN.

In COSMIC-311, hypocalcemia occurred in 36% of patients treated with CABOMETYX, including Grade 3 in 6% and Grade 4 in 3% of patients.

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 (≥20%) adverse reactions are:

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 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.

Forward-Looking Statements
This press release contains forward-looking statements, including, without limitation, statements related to: the presentation of detailed final OS results from the CONTACT-02 trial at ESMO 2024; the therapeutic potential of cabozantinib in combination with atezolizumab to benefit patients with mCRPC and measurable extra-pelvic soft tissue disease who have progressed on one prior NHT, especially in the subset of patients with liver metastasis, and Exelixis’ belief that this combination regimen could be a valuable addition to the treatment landscape for patients with advanced prostate cancer; Exelixis’ plans to submit a supplemental New Drug Application with the U.S. Food and Drug Administration for cabozantinib in combination with atezolizumab for mCRPC later this year; and Exelixis’ scientific pursuit to create transformational treatments that give more patients 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: the availability of data at the referenced times; complexities and the unpredictability of the regulatory review and approval processes in the U.S. and elsewhere; Exelixis’ continuing compliance with applicable legal and regulatory requirements; unexpected concerns that may arise as a result of the occurrence of adverse safety events or additional data analyses of clinical trials evaluating cabozantinib; Exelixis’ dependence on its relationships with its cabozantinib commercial collaboration partners, including the level of their investment in the resources necessary to pursue regulatory approvals and successfully commercialize cabozantinib in the territories where approved; Exelixis’ dependence on third-party vendors for the development, manufacture and supply of cabozantinib; Exelixis’ ability to protect its intellectual property rights; market competition, including the potential for competitors to obtain approval for generic versions of CABOMETYX; changes in economic and business conditions; and other factors affecting Exelixis and its development programs detailed from time to time under the caption “Risk Factors” in Exelixis’ most recent Annual Report on Form 10-K and subsequent Quarterly Reports on Form 10-Q, and in Exelixis’ future filings with the Securities and Exchange Commission. All forward-looking statements in this press release are based on information available to Exelixis as of the date of this press release, and Exelixis undertakes no obligation to update or revise any forward-looking statements contained herein, except as required by law.

Exelixis, the Exelixis logo and CABOMETYX are registered U.S. trademarks of Exelixis.

TECENTRIQ is registered U.S. trademark of Genentech, a member of the Roche Group.

1 Cancer Facts & Figures 2024. ACS. Available at: https://www.cancer.org/content/dam/cancer-org/research/cancer-facts-and-statistics/annual-cancer-facts-and-figures/2024/2024-cancer-facts-and-figures-acs.pdf. Accessed September 2024.

2 Patient education: Treatment for advanced prostate cancer (Beyond the Basics). UpToDate website. Available at: https://www.uptodate.com/contents/treatment-for-advanced-prostate-cancer-beyond-the-basics. Accessed September 2024.

3 Freedland, S. J., et al. Real-world treatment patterns and overall survival among men with Metastatic Castration-Resistant Prostate Cancer (mCRPC) in the US Medicare population. Prostate Cancer Prostatic Dis. 2023.

4 Moreira, D. M., Howard, L. E., Sourbeer, K. N., et al. Predicting Time From Metastasis to Overall Survival in Castration-Resistant Prostate Cancer: Results From SEARCH. Clin Genitourin Cancer. 2017;15:60–66.e2

Investors:

Susan Hubbard

EVP, Public Affairs and Investor Relations

Exelixis, Inc.

(650) 837-8194

shubbard@exelixis.com



Media:

Claire McConnaughey

Senior Director, Public Affairs

Exelixis, Inc.

(650) 837-7052

cmcconn@exelixis.com

Source: Exelixis, Inc.

FAQ

What were the primary endpoints of the CONTACT-02 study for Exelixis (EXEL)?

The two primary endpoints for CONTACT-02 were progression-free survival (PFS) and overall survival (OS).

Did the CONTACT-02 study meet its overall survival endpoint for Exelixis (EXEL)?

No, the study showed a numerical but not statistically significant improvement in overall survival favoring cabozantinib with atezolizumab (HR: 0.89; P=0.296).

Which patient subgroups showed improved overall survival in the Exelixis (EXEL) CONTACT-02 study?

Improved overall survival was observed in patients with bone or liver metastases, particularly in those with liver metastases.

What are Exelixis' (EXEL) plans following the CONTACT-02 study results?

Exelixis intends to submit a supplemental New Drug Application with the FDA for cabozantinib in combination with atezolizumab for mCRPC later this year.

How did the safety profile of cabozantinib with atezolizumab compare to NHT in the Exelixis (EXEL) study?

Treatment-related grade 3-4 adverse events occurred in 40% of patients receiving the combination, compared to 8% for NHT. Discontinuation rates were similar at 5% and 2%, respectively.

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