Sanofi (SNY) 6-KGlobal regulatory submissions will begin in H2 2024

Exhibit 99.3

Press Release

Sarclisa approved in the US as the first anti-CD38 therapy in combination with standard-of-care treatment for adult patients with newly diagnosed multiple myeloma not eligible for transplant

PARIS, September 21, 2024. The US Food and Drug Administration (FDA) has approved Sarclisa (isatuximab) in combination with bortezomib, lenalidomide, and dexamethasone (VRd) as a first line treatment option for adult patients with newly diagnosed multiple myeloma (NDMM) who are not eligible for autologous stem cell transplant (ASCT). Sarclisa is the first anti-CD38 therapy in combination with standard-of-care VRd to significantly reduce disease progression or death (by 40%) compared to VRd alone for patients with NDMM not eligible for transplant.

Thomas Martin M.D.

Helen Diller Family Comprehensive Cancer Center Clinical Professor of Medicine at the University of California San Francisco

“Multiple myeloma is most frequently diagnosed in patients 65 years and older, yet the options for treatment in this population are limited due to a combination of age, frailty, and co-morbidities. This has resulted in a longstanding need for new treatment options that can potentially improve the standard-of-care. The significant clinical benefit and improvements in progression-free survival demonstrated by the IMROZ regimen of isatuximab plus VRd versus VRd alone make today’s approval an important moment for this vulnerable patient population and the larger multiple myeloma community.”

This decision marks the third approved indication for Sarclisa in the US and the first approved indication in newly diagnosed patients. The FDA evaluated Sarclisa for this indication under Priority Review, which is reserved for medicines that represent potentially significant improvements in efficacy or safety in treating serious conditions. Sarclisa is also currently approved in more than 50 countries across two indications for the treatment of people with relapsed or refractory disease.

Brian Foard

Executive Vice President, Head of Specialty Care, Sanofi

“Since first launching in 2020, we have made significant progress towards our ambition of establishing Sarclisa as a best-in-class therapy. The FDA’s decision marks another momentous milestone toward our goal and expands the reach of this potentially transformative therapy to a larger population. With today’s approval, doctors now have an important new option at their disposal that’s been shown to slow disease progression for longer compared to the current standard-of-care for adults living with newly diagnosed multiple myeloma who are not eligible for transplant in the US.”

Results from the IMROZ phase 3 study supporting Sarclisa in NDMM not eligible for ASCT

The FDA approval is based on data from the IMROZ phase 3 study recently presented at the American Society of Clinical Oncology (ASCO) 2024 annual meeting and published in The New England Journal of Medicine. IMROZ is the first global phase 3 study of an anti-CD38 monoclonal antibody in combination with standard-of-care VRd to significantly improve PFS versus VRd alone.

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In the IMROZ study, Sarclisa-VRd followed by Sarclisa-Rd met the primary endpoint of PFS, significantly reducing the risk of recurrence or death by 40%, compared to VRd followed by Rd, in patients with NDMM not eligible for ASCT (HR 0.60; 95% CI: 0.44 to 0.81, p=0.0009). At a median follow-up of 59.7 months, the median PFS with the Sarclisa-VRd combination was not reached versus 54.3 months with VRd. The estimated PFS-rate at 60 months was 63.2% for patients treated with Sarclisa-VRd versus 45.2% for VRd.

Sarclisa-VRd also met several secondary endpoints which demonstrated deep responses in this patient population:

The safety and tolerability of Sarclisa observed in this study was consistent with the established safety profile of Sarclisa and VRd with no new safety signals observed. The most common adverse reactions (≥20%) were upper respiratory tract infections, diarrhea, fatigue, peripheral sensory neuropathy, pneumonia, musculoskeletal pain, cataract, constipation, peripheral edema, rash, infusion-related reaction, insomnia, and COVID-19. The most common hematologic laboratory abnormalities (≥80%) were decreased hemoglobin, decreased leukocytes, decreased lymphocytes, decreased platelets, and decreased neutrophils. Serious adverse reactions occurred in 71% of patients receiving Sarclisa combination therapy. The most frequent serious adverse reaction occurring in more than 5% of patients was pneumonia (30%). Permanent discontinuation of treatment due to an adverse reaction occurred in 22.8% of patients treated with Sarclisa combination therapy, compared to 26% in the comparator arm.

Advancing Sarclisa in multiple myeloma

Sanofi continues to advance Sarclisa as part of a patient-centric clinical development program, which includes several phase 2 and phase 3 studies across the MM treatment continuum spanning six potential indications. In addition, the company is evaluating a subcutaneous administration method for Sarclisa in clinical studies. The safety and efficacy of Sarclisa has not been evaluated by any regulatory authority outside of its approved indications and methods of delivery.

In September, isatuximab-irfc (Sarclisa) was also added to the National Comprehensive Cancer Network (NCCN^®) Clinical Practice Guidelines in Oncology (NCCN Guidelines^®) for MM non-transplant candidates as an NCCN Category 1 Preferred option in combination with VRd for patients <80 years old who are not frail. Category 1 is based upon high-level evidence, there is uniform NCCN consensus that the intervention is appropriate. Preferred intervention are interventions that are based on superior efficacy, safety, and evidence; and, when appropriate, affordability.

*NCCN makes no warranties of any kind whatsoever regarding their content, use or application and disclaims any responsibility for their application or use in any way.

About Sarclisa

Sarclisa (isatuximab) is a monoclonal antibody that binds to a specific epitope on the CD38 receptor on MM cells, inducing distinct antitumor activity. It is designed to work through multiple mechanisms of action including programmed tumor cell death (apoptosis) and immunomodulatory activity. CD38 is highly and uniformly expressed on the surface of MM cells, making it a target for antibody-based therapeutics such as Sarclisa.

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Based on the ICARIA-MM phase 3 study, Sarclisa is approved in more than 50 countries, including the US and the EU, in combination with pomalidomide and dexamethasone for the treatment of patients with relapsed refractory MM (RRMM) who have received ≥2 prior therapies, including lenalidomide and a proteasome inhibitor and who progressed on last therapy. Based on the IKEMA phase 3 study, Sarclisa is also approved in 50 countries in combination with carfilzomib and dexamethasone, including in the US for the treatment of patients with RRMM who have received 1–3 prior lines of therapy and in the EU for patients with MM who have received at least one prior therapy. In the US, the non-proprietary name for Sarclisa is isatuximab-irfc, with irfc as the suffix designated in accordance with nonproprietary naming of biological products guidance for industry issued by the US Food and Drug Administration.

Sarclisa continues to be evaluated in multiple ongoing phase 3 clinical studies in combination with current standard treatments across the MM treatment continuum. It is also under investigation for the treatment of other hematologic malignancies, and its safety and efficacy have not been evaluated by any regulatory authority outside of its approved indication.

Sanofi is committed to pursuing the advancement of Sarclisa through several investigational studies across the MM treatment continuum. Various patient-centric clinical development programs aim to bring Sarclisa to more patients, intercept the disease earlier in the treatment journey, explore potential new combinations and assess subcutaneous administration via a proprietary on body device system. The safety and efficacy of Sarclisa has not been evaluated by any regulatory authority outside of its approved indications and methods of delivery.

In striving to become the number one immunoscience company globally, Sanofi remains committed to advancing oncology innovation. Through focused strategic decisions the company has reshaped and prioritized its pipeline, leveraging its expertise in immunoscience to drive progress. Efforts are centered on difficult-to-treat cancers such as select hematologic malignancies, and solid tumors with critical unmet needs, including multiple myeloma, acute myeloid leukemia, certain types of lymphomas, as well as gastrointestinal and lung cancers.

For more information on Sarclisa clinical studies, please visit www.clinicaltrials.gov.

About multiple myeloma

MM is the second most common hematologic malignancy¹, affecting more than 130,000 patients in the US; approximately 32,000 Americans are diagnosed with MM each year.² Despite available treatments, MM remains an incurable malignancy with an estimated 52% five-year survival rate for newly diagnosed patients.³ According to physician-based surveys, the majority of NDMM patients are not considered eligible for transplant, creating a need for new frontline therapeutic options, particularly due to high attrition rates in subsequent lines of therapy.

About Sanofi

We are an innovative global healthcare company, driven by one purpose: we chase the miracles of science to improve people’s lives. Our team, across the world, is dedicated to transforming the practice of medicine by working to turn the impossible into the possible. We provide potentially life-changing treatment options and life-saving vaccine protection to millions of people globally, while putting sustainability and social responsibility at the center of our ambitions.

Sanofi is listed on EURONEXT: SAN and NASDAQ: SNY

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Investor Relations

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Sanofi Forward-Looking Statements

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¹ Kazandjian. Multiple myeloma epidemiology and survival: A unique malignancy. Semin Oncol. 2016;43(6):676-681. doi:10.1053/j/seminoncol.2016.11.004.

² National Cancer Institute. Myeloma Cancer Stat Facts. Available at: www.seer.cancer.gov/statfacts/html/mulmy.html. Accessed on December 12, 2019.

³ Fonseca, R., Usmani, S.Z., Mehra, M. et al. Frontline treatment patterns and attrition rates by subsequent lines of therapy in patients with newly diagnosed multiple myeloma. BMC Cancer. 2020: 20(1087). https://doi.org/10.1186/s12885-020-07503-y.

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