Nivolumab

Immunocore announces randomization of first patient in the global, registrational Phase 3 clinical trial testing brenetafusp for the treatment of first-line advanced or metastatic cutaneous melanoma The Phase 3 PRISM-MEL-301 trial will study the efficacy and safety of brenetafusp (IMC-F106C; PRAME-A02) in combination with nivolumab versus nivolumab or nivolumab + relatlimab in first-line advanced or metastatic cutaneous melanoma First registrational Phase 3 trial investigating PRAME-targeted therapy (OXFORDSHIRE, England & CONSHOHOCKEN, Penn. & ROCKVILLE, Md., US, 18 June 2024) Immunocore Holdings plc (Nasdaq: IMCR) (“Immunocore” or the “Company”), a commercial-stage biotechnology company pioneering and delivering transformative immunomodulating medicines to radically improve outcomes for patients with cancer, infectious diseases and autoimmune diseases, today announces randomization of the first patient in the PRISM-MEL-301 trial, assessing the efficacy and safety of brenetafusp (IMC-F106C; PRAME-A02), in combination with nivolumab, in first-line advanced or metastatic cutaneous melanoma. “We are very proud to have started the registrational program for brenetafusp, our PRAME candidate, supported by the recent promising brenetafusp monotherapy data in late-line cutaneous melanoma” said Mohammed Dar, Senior Vice President, Clinical Development, and Chief Medical Officer, Immunocore. “The PRISM-MEL-301 trial – the first Phase 3 trial for any PRAME-targeted therapy – will test whether combining brenetafusp with nivolumab may be a more effective treatment option than current standards of care for newly diagnosed metastatic or advanced cutaneous melanoma patients.” The Phase 3 trial (NCT06112314) will randomize HLA-A*02:01 positive patients with first-line, advanced or metastatic cutaneous melanoma to brenetafusp + nivolumab versus a control arm of either nivolumab or nivolumab + relatlimab, depending on country. Bristol Myers Squibb will provide nivolumab. Professor Georgina Long, Co-Medical Director of Melanoma Institute Australia, said: “The PRISM-MEL-301 Phase 3 trial is a great example of outside-the-box scientific thinking, leveraging the immune system in a new way in the hope of beating cancer. My hope is that we can get closer to our goal of zero deaths from melanoma by conducting clinical trials with innovative drug therapies such as this.” The Company has shared the cutaneous melanoma Phase 1 data during an oral presentation at the 2024 American Society of Oncology (ASCO) Annual Meeting on 31 May. The data showed that brenetafusp was well tolerated as monotherapy and in combination with anti-PD1, and demonstrated promising monotherapy clinical activity, including disease control rate (partial response and stable disease), progression free survival, and circulating tumor DNA molecular response. Brenetafusp is the first PRAME x CD3 ImmTAC bispecific protein targeting an HLA-A*02:01 PRAME (PReferentially expressed Antigen in Melanoma) antigen. The Company is continuing to enroll patients into a Phase 1/2 trial in monotherapy and combination arms across multiple tumor types, including three expansion arms for patients with advanced ovarian, non-small cell lung, and endometrial cancers. About ImmTAC® molecules for cancer Immunocore’s proprietary T cell receptor (TCR) technology generates a novel class of bispecific biologics called ImmTAC (Immune mobilizing monoclonal TCRs Against Cancer) molecules that are designed to redirect the immune system to recognize and kill cancerous cells. ImmTAC molecules are soluble TCRs engineered to recognize intracellular cancer antigens with ultra-high affinity and selectively kill these cancer cells via an anti-CD3 immune-activating effector function. Based on the demonstrated mechanism of T cell infiltration into human tumors, the ImmTAC mechanism of action holds the potential to treat hematologic and solid tumors, regardless of mutational burden or immune infiltration, including immune “cold” low mutation rate tumors. About PRISM-MEL-301 – Phase 3 trial with brenetafusp (IMC-F106C, PRAME-A02) in 1L advanced cutaneous melanoma The Phase 3 registrational trial will randomize HLA-A*02:01-positive patients with previously untreated advanced melanoma to brenetafusp + nivolumab versus nivolumab or nivolumab + relatlimab, depending on the country where the patient is enrolled. The trial will initially randomize to three arms: two brenetafusp dose regimens (40 mcg and 160 mcg) and control arm and will discontinue one of the brenetafusp dose regimens after an initial review of the first 60 patients randomized to the two experimental arms (90 patients randomized total). The primary endpoint of the trial is progression free survival (PFS) by blinded independent central review (BICR), with secondary endpoints of overall survival (OS) and overall response rate (ORR). About the IMC-F106C-101 Phase 1/2 trial IMC-F106C-101 is a first-in-human, Phase 1/2 dose escalation trial in patients with multiple solid tumor cancers including non-small cell lung cancer (NSCLC), small-cell lung cancer (SCLC), endometrial, ovarian, cutaneous melanoma, and breast cancers. The Phase 1 dose escalation trial was designed to determine the maximum tolerated dose (MTD), as well as to evaluate the safety, preliminary anti-tumor activity and pharmacokinetics of IMC-F106C (brenetafusp), a bispecific protein built on Immunocore’s ImmTAC technology, and the Company’s first molecule to target the PRAME antigen. The Company has initiated patient enrollment into four expansion arms in cutaneous melanoma, ovarian, NSCLC, and endometrial carcinomas. The IMC-F106C-101 trial is adaptive and includes the option for Phase 2 expansion, allowing for approximately 100 patients treated per tumor type in the Phase 1 and 2 expansion arms. Ph1 monotherapy continues in additional solid tumors as well as multiple combinations with standards-of-care, including checkpoint inhibitors, chemotherapy, targeted therapies, and tebentafusp. About Cutaneous Melanoma Cutaneous melanoma (CM) is the most common form of melanoma. It is the most aggressive skin carcinoma and is associated with the vast majority of skin cancer-related mortality. The majority of patients with CM are diagnosed before metastasis but survival remains poor for the large proportion of patients with metastatic disease. Despite recent progress in advanced melanoma therapy, there is still an unmet need for new therapies that improve first-line response rates and duration of response as well as for patients who are refractory to first-line treatments. About Immunocore Immunocore is a commercial-stage biotechnology company pioneering the development of a novel class of TCR bispecific immunotherapies called ImmTAX – Immune mobilizing monoclonal TCRs Against X disease – designed to treat a broad range of diseases, including cancer, autoimmune, and infectious disease. Leveraging its proprietary, flexible, off-the-shelf ImmTAX platform, Immunocore is developing a deep pipeline in multiple therapeutic areas, including nine active clinical and pre-clinical programs​ in oncology, infectious diseases, and autoimmune diseases. The Company’s most advanced oncology TCR therapeutic, KIMMTRAK has been approved for the treatment of HLA-A*02:01-positive adult patients with unresectable or metastatic uveal melanoma in the United States, European Union, Canada, Australia, and the United Kingdom. Forward Looking Statements This press release contains “forward-looking statements” within the meaning of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Words such as “may,” “will,” “believe,” “expect,” “plan,” “anticipate,” “estimate,” and similar expressions (as well as other words or expressions referencing future events or circumstances) are intended to identify forward-looking statements. All statements, other than statements of historical facts, included in this press release are forward-looking statements. These statements include, but are not limited to, statements regarding the expected clinical benefits of brenetafusp and the Company’s expectations regarding the design, progress, randomization and scope of the Phase 3 PRISM-MEL301 trial with brenetafusp plus nivolumab versus standard nivolumab in 1L advanced cutaneous melanoma and the IMC-F106C-101 Phase 1/2 dose escalation trial with brenetafusp in patients with multiple solid tumor cancers including non-small cell lung cancer, small-cell lung cancer, endometrial, ovarian, cutaneous melanoma, and breast cancers. Any forward-looking statements are based on management’s current expectations and beliefs of future events and are subject to a number of risks and uncertainties that could cause actual events or results to differ materially and adversely from those set forth in or implied by such forward-looking statements, many of which are beyond the Company’s control. These risks and uncertainties include, but are not limited to, the impact of worsening macroeconomic conditions on the Company’s business, financial position, strategy and anticipated milestones, including Immunocore’s ability to conduct ongoing and planned clinical trials; Immunocore’s ability to obtain a clinical supply of current or future product candidates or commercial supply of KIMMTRAK or any future approved products, including as a result of health epidemics or pandemics, war in Ukraine, the conflict between Hamas and Israel, the broader risk of a regional conflict in the Middle East, or global geopolitical tension; Immunocore’s ability to obtain and maintain regulatory approval of its product candidates, including KIMMTRAK; Immunocore’s ability and plans in continuing to establish and expand a commercial infrastructure and to successfully launch, market and sell KIMMTRAK and any future approved products; Immunocore’s ability to successfully expand the approved indications for KIMMTRAK or obtain marketing approval for KIMMTRAK in additional geographies in the future; the delay of any current or planned clinical trials, whether due to patient enrollment delays or otherwise; Immunocore’s ability to successfully demonstrate the safety and efficacy of its product candidates and gain approval of its product candidates on a timely basis, if at all; competition with respect to market opportunities; unexpected safety or efficacy data observed during preclinical studies or clinical trials; actions of regulatory agencies, which may affect the initiation, timing and progress of clinical trials or future regulatory approval; Immunocore’s need for and ability to obtain additional funding, on favorable terms or at all, including as a result of worsening macroeconomic conditions, including inflation, interest rates and unfavorable general market conditions, and the impacts thereon of the war in Ukraine, the conflict between Hamas and Israel, and global geopolitical tension; Immunocore’s ability to obtain, maintain and enforce intellectual property protection for KIMMTRAK or any of its product candidates it or its collaborators are developing; and the success of Immunocore’s current and future collaborations, partnerships or licensing arrangements. These and other risks and uncertainties are described in greater detail in the section titled "Risk Factors" in Immunocore’s filings with the Securities and Exchange Commission, including Immunocore’s most recent Annual Report on Form 10-K for the year ended December 31, 2023 filed with the Securities and Exchange Commission on February 28, 2024, as well as discussions of potential risks, uncertainties, and other important factors in the Company’s subsequent filings with the Securities and Exchange Commission. All information in this press release is as of the date of the release, and the Company undertakes no duty to update this information, except as required by law. Contact Information Immunocore Sébastien Desprez, Head of CommunicationsT: +44 (0) 7458030732E: sebastien.desprez@immunocore.comFollow on Twitter: @Immunocore Investor Relations Clayton Robertson, Head of Investor RelationsT: +1 (215) 384-4781E: ir@immunocore.com

Multikine significantly increases overall survival in patients with low levels of tumor cell PD-L1 expression in contrast to approved checkpoint inhibitors 73% survival for Multikine vs 45% in the control arm at 5 years Statistically significant log rank p = 0.0015 5-year risk of death cut in half from 55% to 27% Hazard ratio = 0.35 (95% CIs [0.19, 0.66]) Working to commence FDA confirmatory Registration Study for Multikine VIENNA, Va.--(BUSINESS WIRE)-- CEL-SCI Corporation (NYSE American: CVM) today announced the Company’s Chief Scientific Officer, Dr. Eyal Talor, delivered a presentation titled “Neoadjuvant Immunotherapy for Head and Neck Cancer: Low Tumor PD-L1 Expression - IT-MATTERS – RCT” at the International Drug Discovery Science & Technology (IDDST) 20th Annual Congress in Budapest, Hungary on Tuesday, June 18, 2024. Dr. Talor presented during the Cancers/Tumors session which he Chaired along with Dr. Elizabeth Tran of Purdue University. This press release features multimedia. View the full release here: (Graphic: Business Wire) Multikine* (Leukocyte Interleukin, Injection) is the first investigational pre-surgical cancer drug intended for use in newly diagnosed locally advanced resectable head and neck cancer. There is extensive affirmative safety and efficacy data from 750 patients who have been treated with Multikine. A randomized, controlled, Phase 3 trial (RCT) in head and neck cancer revealed that Multikine significantly increases overall survival in patients with low levels of tumor cell PD-L1 expression in contrast to checkpoint inhibitors (e.g. Keytruda, Opdivo) which show longer survival benefit in patients with a higher level of tumor cell PD-L1 expression. Tumor cell PD-L1, also known as Programmed Death-Ligand 1, is a protein that plays a crucial role in immune system regulation. It is the target pathway for immune checkpoint inhibitors, a major class of immune-oncology drugs which work by blocking the interaction between tumor cell PD-L1 and the PD-1 receptor on immune effector cells, thereby favoring immune evasion by the tumor. “The survival benefit of Multikine we observed from previous data for the same study population is much higher than that which will be required to be successful in the confirmatory study,” stated Dr. Talor. The presentation may be accessed on CEL-SCI’s website at the following: About CEL-SCI Corporation CEL-SCI believes that boosting a patient’s immune system while it is still intact should provide the greatest possible impact on survival. Multikine is designed to help the immune system "target" the tumor at a time when the immune system is still relatively intact and thereby thought to be better able to mount an attack on the tumor. Multikine (Leukocyte Interleukin, Injection), a true first-line cancer therapy, has been dosed in over 750 patients and received Orphan Drug designation from the FDA for neoadjuvant therapy in patients with squamous cell carcinoma (cancer) of the head and neck. Multikine significantly extended life in its target patient population demonstrating a 73% survival rate with Multikine treatment regimen plus standard of Care (SOC) vs. only 45% for SOC without Multikine, at 5 years after treatment, Kaplan-Meier life table log rank p-value 0.0015. Based on this very strong data, the FDA concurred with CEL-SCI’s target patient selection criteria and gave the go-ahead to conduct a smaller, focused, confirmatory Registration Study of 212 patients. CEL-SCI will enroll newly diagnosed treatment naïve locally advanced primary SCC of the head and neck (oral cavity) cancer patients with no lymph node involvement (determined via PET scan) and with low PD-L1 tumor expression (determined via biopsy). Globally, there are approximately 100,000 patients meeting these diagnostic criteria annually. The Company has operations in Vienna, Virginia, and near/in Baltimore, Maryland. Forward-Looking Statements This press release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. When used in this press release, the words "intends," "believes," "anticipated," "plans" and "expects," and similar expressions, are intended to identify forward-looking statements. Such statements are subject to risks and uncertainties that could cause actual results to differ materially from those projected. Factors that could cause or contribute to such differences include an inability to duplicate the clinical results demonstrated in clinical studies, timely development of any potential products that can be shown to be safe and effective, receiving necessary regulatory approvals, difficulties in manufacturing any of the Company's potential products, inability to raise the necessary capital and the risk factors set forth from time to time in CEL-SCI's filings with the Securities and Exchange Commission, including but not limited to its report on Form 10-K for the year ended September 30, 2023. The Company undertakes no obligation to publicly release the result of any revision to these forward-looking statements which may be made to reflect the events or circumstances after the date hereof or to reflect the occurrence of unanticipated events. * Multikine (Leukocyte Interleukin, Injection) is the trademark that CEL-SCI has registered for this investigational therapy. This proprietary name is subject to FDA review in connection with the Company's future anticipated regulatory submission for approval. Multikine has not been licensed or approved for sale, barter or exchange by the FDA or any other regulatory agency. Similarly, its safety or efficacy has not been established for any use. View source version on businesswire.com: Contacts Gavin de Windt CEL-SCI Corporation (703) 506-9460 Source: CEL-SCI Corporation Smart Multimedia Gallery Photo (Graphic: Business Wire) Logo View this news release and multimedia online at: