New Analyses of Kite's Tecartus® CAR T-Cell Therapy Provide Additional Evidence Supporting Overall Survival and Durability of Response

-- Analyses Examined Responses in Relapsed or Refractory B-Cell Acute Lymphoblastic Leukemia and Relapsed or Refractory Mantle Cell Lymphoma --

Kite, a Gilead Company (Nasdaq: GILD), today announced findings from follow-up analyses of two pivotal studies (ZUMA-2 and ZUMA-3) of the CAR T-cell therapy Tecartus^® (brexucabtagene autoleucel). A comparison of two-year follow-up from ZUMA-3 and SCHOLAR-3, a retrospective historical control study, evaluating Tecartus versus standard of care (SOC) in adult patients with relapsed/refractory (R/R) B-cell acute lymphoblastic leukemia (B-ALL), was presented in a poster session at the 2022 American Society of Hematology (ASH) Annual Meeting & Exposition on December 10 (Abstract #1368) and simultaneously published in the Journal of Hematology & Oncology.

An additional exploratory analysis on patient and product characteristics associated with long-term response from the three-year follow-up of the Phase 2 ZUMA-2 study of Tecartus in patients with R/R mantle cell lymphoma (MCL) was also presented in a poster session on December 12 (Abstract #4199).

Finally, a comparison analysis of ZUMA-2 and SCHOLAR-2, a retrospective historical control study, evaluating Tecartus vs. SOC in adult patients with R/R MCL, was presented in a poster session on December 12 (Abstract # 4627).

“These analyses continue to support the significant and sustained responses with Tecartus that we saw in the ZUMA-2 and ZUMA-3 studies,” said Frank Neumann, MD, PhD, SVP & Global Head of Clinical Development, Kite. “The updated results reinforce that Tecartus has the potential for long-term remission for difficult-to-treat blood cancers like relapsed and refractory mantle cell lymphoma and B-cell acute lymphoblastic leukemia.”

Abstract #1368

Outcomes From the Historical Control Study SCHOLAR-3 Contextualizing Updated ZUMA-3 Results of Brexucabtagene Autoleucel (KTE-X19) in Adult Patients With Relapsed or Refractory B-Cell Acute Lymphoblastic Leukemia (R/R B-ALL)

A propensity score matching analysis comparing follow-up from the ZUMA-3 study (n=20 [blinatumomab/inotuzumab treatment-naïve], n=29 [blinatumomab/inotuzumab treated]) to matched patients from the SCHOLAR-3 external control cohort of historical clinical trials (n=20, n=20, respectively; median follow-up of 26.8 months), balanced for patient characteristics demonstrated that Tecartus had superior overall survival (OS) versus SOC regardless of prior therapies (blinatumomab/inotuzumab-treated or -naive). In the historical clinical trials, median OS was less than six months versus >25 months among matched patients in ZUMA-3 (5.5 months vs. 25.5 months [P<0.0001]). In those patients who were previously naïve to blinatumomab and inotuzumab, comparisons for complete remission (CR) and CR with incomplete hematological recovery (CRi) at 24 weeks were also conducted. CR/CRi rates among those treated with Tecartus in ZUMA-3 were more than two times those treated with SOC [85% (95% CI, 62.1-96.8) versus 35% (95% CI, 15.4-59.2; P=.0031)].

“Across efficacy measures in this propensity score matching analysis, Tecartus demonstrates impressive benefit over standard of care in relapsed or refractory B-cell acute lymphoblastic leukemia,” said Bijal Shah, MD, ZUMA-3 investigator and medical oncologist, Moffitt Cancer Center, Tampa, Florida. “The significant improvement in survival is especially exciting as these patients typically have poor response to treatment and short remissions.”

Abstract #4199

Assessment of Durable Responses After Brexucabtagene Autoleucel (KTE-X19) in the ZUMA-2 Study in Relapsed/Refractory Mantle Cell Lymphoma (R/R MCL)

A separate exploratory analysis of ZUMA-2 was designed to identify factors associated with long-term response to Tecartus in adults with R/R MCL, comparing patients who remained in ongoing response at 24 months (47%; n=29; “ongoing responders”) and those who had relapsed (48%; n=30; “relapsed responders”). Patients had received a median of three prior therapies, including ibrutinib as last prior therapy (66% in ongoing responders versus 43% in relapsed responders) and acalabrutinib as last prior therapy (14% in ongoing responders versus 13% in relapsed responders), with a median time from last prior therapy of 63.0 and 64.5 months, respectively. A smaller proportion of ongoing responders compared with relapsed responders received bridging therapy (21% versus 53%) and prior platinum therapy (10% versus 40%). Similar proportions of patients in each group had received prior bendamustine therapy (45% versus 53%), prior proteosome inhibitor therapy (41% and 37%), and prior autologous stem cell transplant (48% versus 37%). At baseline, a greater proportion of ongoing responders had an ECOG score of 0 compared to relapsed responders (79% versus 57%) and the incidence of high-risk features was similar between the two groups. Levels of CAR T-cells were approximately double in ongoing versus relapsed responders (median 102.4 cells/µL [range, 0.3-2241.6] versus median 59.9 cells/µL [range, 1.6-2589.5]).

“After three years of median follow-up, nearly half of patients in the ZUMA-2 study remain in ongoing response at two years post-infusion, attesting to the durability of the response to brexucabtagene autoleucel in patients with mantle cell lymphoma,” said Michael Wang, MD, ZUMA-2 investigator and Professor, Department of Lymphoma, Myeloma – Division of Cancer Medicine, MD Anderson. “This analysis also helps us understand who may be most likely to achieve long-term response, as patients with lower ECOG score and less tumor burden achieved a longer response.”

Abstract #4627

A Comparison of Overall Survival with Brexucabtagene Autoleucel (Brexu-cel) CAR T-Cell Therapy (ZUMA-2) and Standard of Care (SCHOLAR-2) in Patients with Relapsed/Refractory Mantle Cell Lymphoma (R/R MCL) Previously Treated with a Covalent Bruton Tyrosine Kinase Inhibitor (BTKi)

In a separate presentation, results from an indirect treatment comparison study assessing individual patient data from ZUMA-2 and the retrospective, observational, SCHOLAR-2 study, further support long-term efficacy of Tecartus in adults with R/R MCL. The study investigated the comparative efficacy of brexucabtagene autoleucel versus SOC in patients with R/R MCL who had previously been treated with Bruton Tyrosine Kinase Inhibitor therapy using three different statistical methods to adjust for imbalances between the non-randomized studied populations. These data suggested improved OS for patients treated with brexucabtagene autoleucel (n=68) versus SOC (n=59), in which the median OS was 46.6 months (95% CI: 24.9–not reached) versus 14.2 (95% CI 6.8-30.9), HR 0.38 (95% CI: 0.23–0.63; p < 0.001), inverse probability weighting adjusted [IPW]), respectively.

Tecartus is currently approved for the treatment of R/R MCL, as the first and only CAR T-cell therapy to receive accelerated approval from the U.S. Food and Drug Administration (FDA) in this indication. Tecartus is also approved for R/R B-cell ALL, as the first and only CAR T-cell therapy approved for adults 26 years or older. The Tecartus U.S. Prescribing Information has a Boxed Warning in its product label regarding the risks of CRS and neurologic toxicities, and Tecartus is approved with a risk evaluation and mitigation strategy (REMS) due to these risks; see below for Indication and Important Safety Information.

About B-ALL

ALL is an aggressive type of blood cancer that can also involve the lymph nodes, spleen, liver, central nervous system and other organs. Globally, approximately 64,200 people are diagnosed with ALL each year. Of those, 60% of cases occur in those under age 20. Approximately 1,000 adults in the U.S. are treated annually for relapsed or refractory ALL. B-cell precursor ALL is the most common form, accounting for approximately 75% of cases, and treatment is typically associated with inferior outcomes compared with other types of ALL. Survival rates remain very poor in adult patients with relapsed or refractory ALL, with median OS at less than eight months.

About MCL

MCL is a rare form of non-Hodgkin lymphoma (NHL) that arises from cells originating in the “mantle zone” of the lymph node and predominantly affects men over the age of 60. Approximately 33,000 people worldwide are diagnosed with MCL each year. MCL is highly aggressive following relapse, with many patients progressing following therapy.

About Tecartus

Please see full FDA Prescribing Information, including BOXED WARNING and Medication Guide.

Tecartus is a CD19-directed genetically modified autologous T cell immunotherapy indicated for the treatment of:

• Adult patients with relapsed or refractory mantle cell lymphoma (MCL).

This indication is approved under accelerated approval based on overall response rate and durability of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial.

• Adult patients with relapsed or refractory B-cell precursor acute lymphoblastic leukemia (ALL).

U.S. IMPORTANT SAFETY INFORMATION

BOXED WARNING: CYTOKINE RELEASE SYNDROME and NEUROLOGIC TOXICITIES

• Cytokine Release Syndrome (CRS), including life-threatening reactions, occurred in patients receiving Tecartus. Do not administer Tecartus to patients with active infection or inflammatory disorders. Treat severe or life-threatening CRS with tocilizumab or tocilizumab and corticosteroids.
• Neurologic toxicities, including life-threatening reactions, occurred in patients receiving Tecartus, including concurrently with CRS or after CRS resolution. Monitor for neurologic toxicities after treatment with Tecartus. Provide supportive care and/or corticosteroids as needed.
• Tecartus is available only through a restricted program under a Risk Evaluation and Mitigation Strategy (REMS) called the Yescarta and Tecartus REMS Program.

Cytokine Release Syndrome (CRS), including life-threatening reactions, occurred following treatment with Tecartus. In ZUMA-2, CRS occurred in 91% (75/82) of patients receiving Tecartus, including ≥ Grade 3 CRS in 18% of patients. Among the patients who died after receiving Tecartus, one had a fatal CRS event. The median time to onset of CRS was three days (range: 1 to 13 days) and the median duration of CRS was ten days (range: 1 to 50 days). Among patients with CRS, the key manifestations (>10%) were similar in MCL and ALL and included fever (93%), hypotension (62%), tachycardia (59%), chills (32%), hypoxia (31%), headache (21%), fatigue (20%), and nausea (13%). Serious events associated with CRS included hypotension, fever, hypoxia, tachycardia, and dyspnea.

Ensure that a minimum of two doses of tocilizumab are available for each patient prior to infusion of Tecartus. Following infusion, monitor patients for signs and symptoms of CRS daily for at least seven days at the certified healthcare facility, and for four weeks thereafter. Counsel patients to seek immediate medical attention should signs or symptoms of CRS occur at any time. At the first sign of CRS, institute treatment with supportive care, tocilizumab, or tocilizumab and corticosteroids as indicated.

Neurologic Events, including those that were fatal or life-threatening, occurred following treatment with Tecartus. Neurologic events occurred in 81% (66/82) of patients with MCL, including ≥ Grade 3 in 37% of patients. The median time to onset for neurologic events was six days (range: 1 to 32 days) with a median duration of 21 days (range: 2 to 454 days) in patients with MCL. Neurologic events occurred in 87% (68/78) of patients with ALL, including ≥ Grade 3 in 35% of patients. The median time to onset for neurologic events was seven days (range: 1 to 51 days) with a median duration of 15 days (range: 1 to 397 days) in patients with ALL. For patients with MCL, 54 (66%) patients experienced CRS before the onset of neurological events. Five (6%) patients did not experience CRS with neurologic events and eight patients (10%) developed neurological events after the resolution of CRS. Neurologic events resolved for 119 out of 134 (89%) patients treated with Tecartus. Nine patients (three patients with MCL and six patients with ALL) had ongoing neurologic events at the time of death. For patients with ALL, neurologic events occurred before, during, and after CRS in 4 (5%), 57 (73%), and 8 (10%) of patients; respectively. Three patients (4%) had neurologic events without CRS. The onset of neurologic events can be concurrent with CRS, following resolution of CRS or in the absence of CRS.

The most common neurologic events (>10%) were similar in MCL and ALL and included encephalopathy (57%), headache (37%), tremor (34%), confusional state (26%), aphasia (23%), delirium (17%), dizziness (15%), anxiety (14%), and agitation (12%). Serious events including encephalopathy, aphasia, confusional state, and seizures occurred after treatment with Tecartus.

Monitor patients daily for at least seven days for patients with MCL and at least 14 days for patients with ALL at the certified healthcare facility and for four weeks following infusion for signs and symptoms of neurologic toxicities and treat promptly.

REMS Program: Because of the risk of CRS and neurologic toxicities, Tecartus is available only through a restricted program under a Risk Evaluation and Mitigation Strategy (REMS) called the Yescarta and Tecartus REMS Program which requires that:

• Healthcare facilities that dispense and administer Tecartus must be enrolled and comply with the REMS requirements. Certified healthcare facilities must have on-site, immediate access to tocilizumab, and ensure that a minimum of two doses of tocilizumab are available for each patient for infusion within two hours after Tecartus infusion, if needed for treatment of CRS.
• Certified healthcare facilities must ensure that healthcare providers who prescribe, dispense, or administer Tecartus are trained in the management of CRS and neurologic toxicities. Further information is available at www.YescartaTecartusREMS.com or 1-844-454-KITE (5483).

Hypersensitivity Reactions: Serious hypersensitivity reactions, including anaphylaxis, may occur due to dimethyl sulfoxide (DMSO) or residual gentamicin in Tecartus.

Severe Infections: Severe or life-threatening infections occurred in patients after Tecartus infusion. Infections (all grades) occurred in 56% (46/82) of patients with MCL and 44% (34/78) of patients with ALL. Grade 3 or higher infections, including bacterial, viral, and fungal infections, occurred in 30% of patients with ALL and MCL. Tecartus should not be administered to patients with clinically significant active systemic infections. Monitor patients for signs and symptoms of infection before and after Tecartus infusion and treat appropriately. Administer prophylactic antimicrobials according to local guidelines.

Febrile neutropenia was observed in 6% of patients with MCL and 35% of patients with ALL after Tecartus infusion and may be concurrent with CRS. The febrile neutropenia in 27 (35%) of patients with ALL includes events of “febrile neutropenia” (11 (14%)) plus the concurrent events of “fever” and “neutropenia” (16 (21%)). In the event of febrile neutropenia, evaluate for infection and manage with broad spectrum antibiotics, fluids, and other supportive care as medically indicated.

In immunosuppressed patients, life-threatening and fatal opportunistic infections have been reported. The possibility of rare infectious etiologies (e.g., fungal and viral infections such as HHV-6 and progressive multifocal leukoencephalopathy) should be considered in patients with neurologic events and appropriate diagnostic evaluations should be performed.

Hepatitis B virus (HBV) reactivation, in some cases resulting in fulminant hepatitis, hepatic failure, and death, can occur in patients treated with drugs directed against B cells. Perform screening for HBV, HCV, and HIV in accordance with clinical guidelines before collection of cells for manufacturing.

Prolonged Cytopenias: Patients may exhibit cytopenias for several weeks following lymphodepleting chemotherapy and Tecartus infusion. In patients with MCL, Grade 3 or higher cytopenias not resolved by Day 30 following Tecartus infusion occurred in 55% (45/82) of patients and included thrombocytopenia (38%), neutropenia (37%), and anemia (17%). In patients with ALL who were responders to Tecartus treatment, Grade 3 or higher cytopenias not resolved by Day 30 following Tecartus infusion occurred in 20% (7/35) of the patients and included neutropenia (12%) and thrombocytopenia (12%); Grade 3 or higher cytopenias not resolved by Day 60 following Tecartus infusion occurred in 11% (4/35) of the patients and included neutropenia (9%) and thrombocytopenia (6%). Monitor blood counts after Tecartus infusion.

Hypogammaglobulinemia: B cell aplasia and hypogammaglobulinemia can occur in patients receiving treatment with Tecartus. Hypogammaglobulinemia was reported in 16% (13/82) of patients with MCL and 9% (7/78) of patients with ALL. Monitor immunoglobulin levels after treatment with Tecartus and manage using infection precautions, antibiotic prophylaxis, and immunoglobulin replacement.

The safety of immunization with live viral vaccines during or following Tecartus treatment has not been studied. Vaccination with live virus vaccines is not recommended for at least six weeks prior to the start of lymphodepleting chemotherapy, during Tecartus treatment, and until immune recovery following treatment with Tecartus.

Secondary Malignancies may develop. Monitor life-long for secondary malignancies. In the event that one occurs, contact Kite at 1-844-454-KITE (5483) to obtain instructions on patient samples to collect for testing.

Effects on Ability to Drive and Use Machines: Due to the potential for neurologic events, including altered mental status or seizures, patients are at risk for altered or decreased consciousness or coordination in the 8 weeks following Tecartus infusion. Advise patients to refrain from driving and engaging in hazardous activities, such as operating heavy or potentially dangerous machinery, during this period.

Adverse Reactions: The most common non-laboratory adverse reactions (≥ 20%) were fever, cytokine release syndrome, hypotension, encephalopathy, tachycardia, nausea, chills, headache, fatigue, febrile neutropenia, diarrhea, musculoskeletal pain, hypoxia, rash, edema, tremor, infection with pathogen unspecified, constipation, decreased appetite, and vomiting. The most common serious adverse reactions (≥ 2%) were cytokine release syndrome, febrile neutropenia, hypotension, encephalopathy, fever, infection with pathogen unspecified, hypoxia, tachycardia, bacterial infections, respiratory failure, seizure, diarrhea, dyspnea, fungal infections, viral infections, coagulopathy, delirium, fatigue, hemophagocytic lymphohistiocytosis, musculoskeletal pain, edema, and paraparesis.

Please see full Prescribing Information, including BOXED WARNING and Medication Guide.

About Kite

Kite, a Gilead Company, is a global biopharmaceutical company based in Santa Monica, California, focused on cell therapy to treat and potentially cure cancer. As the global cell therapy leader, Kite has treated more patients with CAR T-cell therapy than any other company. Kite has the largest in-house cell therapy manufacturing network in the world, spanning process development, vector manufacturing, clinical trial production and commercial product manufacturing. For more information on Kite, please visit www.kitepharma.com.

About Gilead Sciences

Gilead Sciences, Inc. is a biopharmaceutical company that has pursued and achieved breakthroughs in medicine for more than three decades, with the goal of creating a healthier world for all people. The company is committed to advancing innovative medicines to prevent and treat life-threatening diseases, including HIV, viral hepatitis and cancer. Gilead operates in more than 35 countries worldwide, with headquarters in Foster City, California.

Forward-Looking Statements

This press release includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that are subject to risks, uncertainties and other factors, including the risk that physicians and patients may not see the potential benefits of Tecartus for the treatment of adult patients with relapsed or refractory B-cell ALL or MCL; the possibility of unfavorable results from ongoing and additional clinical trials involving Tecartus; and the possibility that Tecartus may not receive regulatory approvals in the European Union and United Kingdom for the treatment of adult patients with relapsed or refractory B-cell ALL or MCL in the anticipated timelines or at all, and the risk that any such approvals, if granted, may have significant limitation on its use. These and other risks, uncertainties and other factors are described in detail in Gilead’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2022, as filed with the U.S. Securities and Exchange Commission. These risks, uncertainties and other factors could cause actual results to differ materially from those referred to in the forward-looking statements. All statements other than statements of historical fact are statements that could be deemed forward-looking statements. Investors are cautioned that any such forward-looking statements are not guarantees of future performance and involve risks and uncertainties and are cautioned not to place undue reliance on these forward-looking statements. All forward-looking statements are based on information currently available to Kite and Gilead, and Kite and Gilead assume no obligation and disclaim any intent to update any such forward-looking statements.

U.S. Prescribing Information for Tecartus including BOXED WARNING, is available at www.kitepharma.com and www.gilead.com.

Kite, the Kite logo, Tecartus, XLP and GILEAD are trademarks of Gilead Sciences, Inc. or its related companies.

For more information on Kite, please visit the company’s website at www.kitepharma.com or call Gilead Public Affairs at 1-800-GILEAD-5 or 1-650-574-3000. Follow Kite on social media on Twitter (@KitePharma) and LinkedIn.

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