PARIS and TARRYTOWN, N.Y. – February 9, 2021 - The U.S. Food and Drug Administration (FDA) has approved the PD-1 inhibitor Libtayo® (cemiplimab-rwlc) as the first immunotherapy indicated for patients with advanced basal cell carcinoma (BCC) previously treated with an hedgehog pathway inhibitor (HHI) or for whom an HHI is not appropriate. Full approval was granted for patients with locally advanced BCC and accelerated approval was granted for patients with metastatic BCC.

“Patients with advanced forms of basal cell carcinoma face a very difficult prognosis,” said Peter Adamson, Global Development Head, Oncology and Pediatric Innovation at Sanofi. “Thanks to the participation and support of researchers, clinicians, and patients around the world, we are proud to bring forward a new immunotherapy treatment option for appropriate patients in the U.S. affected by advanced BCC, another devastating non-melanoma skin cancer. Together with Regeneron, we continue to develop Libtayo in numerous clinical trials and settings, including as monotherapy and in combination with several other therapeutic approaches as part of our commitment to innovation towards meaningful treatment options for patients with significant unmet needs.”

Libtayo is the first treatment to show a clinical benefit in patients with advanced BCC after HHI therapy in a pivotal trial. The full approval in locally advanced BCC is based on the primary analysis from the trial, and the accelerated approval in metastatic BCC is based on an interim analysis showing the impact of Libtayo on tumor response rate and durability of response. Continued approval may be contingent on additional data from the trial verifying clinical benefit.

“Today’s FDA approval of Libtayo will change the treatment paradigm for patients with advanced basal cell carcinoma,” Karl Lewis, M.D., Professor in the Division of Medical Oncology at the University of Colorado and a trial investigator. “Advanced basal cell carcinoma is a persistent, painful and highly disfiguring cancer. While the primary systemic treatment options are hedgehog inhibitors, many patients will eventually progress on or become intolerant to this therapy. With Libtayo, these patients now have a new immunotherapy option that has demonstrated clinically meaningful and durable anti-tumor responses in locally advanced BCC.”

This marks the second U.S. approval for Libtayo, and is based on FDA Priority Review, which is reserved for medicines that, if approved, would represent significant improvements in safety or efficacy in treating serious conditions. In 2018, Libtayo was approved as the first systemic treatment for adults with metastatic cutaneous squamous cell carcinoma (CSCC) or locally advanced CSCC who are not candidates for curative surgery or curative radiation. Immune-mediated adverse reactions, which may be severe or fatal, can occur in any organ system or tissue during or after treatment with Libtayo.

BCC is the most common type of skin cancer in the U.S., with approximately two million new cases diagnosed every year. While the vast majority of BCCs are caught early and cured with surgery and radiation, a small proportion of tumors can become advanced and penetrate deep into surrounding tissues (locally advanced) or spread to other parts of the body (metastatic), which is more difficult to treat.

“With today’s approval, Libtayo is now approved for both advanced cutaneous squamous cell and basal cell carcinomas, building a strong foundation in dermato-oncology,” said Israel Lowy, M.D., Ph.D., Senior Vice President, Translational and Clinical Sciences, Oncology, at Regeneron. “Beyond skin cancers, we also continue to investigate the potential of Libtayo in other difficult-to-treat cancers, starting with non-small cell lung cancer where an FDA decision is expected by the end of February.”

Pivotal Clinical Trial Supporting the Approval

The FDA approval of Libtayo was based on an open-label, multicenter, non-randomized Phase 2 trial of patients with unresectable locally advanced BCC or metastatic BCC (nodal or distant). This was the largest prospective clinical trial (n=132) among this patient population, with 112 patients included in the efficacy analysis. Patients in both cohorts had either progressed on HHI therapy, had not had an objective response after 9 months on HHI therapy, or were intolerant of prior HHI therapy.

The primary efficacy endpoint was confirmed objective response rate (ORR) and a key secondary endpoint was duration of response (DOR), assessed by independent central review.

Efficacy results for patients treated with Libtayo 350 mg every three weeks were clinically meaningful and durable, with specific data as follows:

+: Denotes ongoing at last assessment

1. Median duration of follow up: mBCC 9.5 months; laBCC 15.1 months
2. With longer follow-up, ORR in laBCC increased to 26 patients (31%) as reported at ESMO 2020

Among patients evaluable for safety (n=132), the most common adverse reactions reported in at least 15% of patients were fatigue, musculoskeletal pain, diarrhea, rash, pruritus and upper respiratory tract infection. Serious adverse reactions occurred in 32% of patients; those occurring in at least two patients included urinary tract infection, colitis, acute kidney injury, adrenal insufficiency, anemia, infected neoplasm and somnolence. Adverse reactions resulting in permanent discontinuation occurred in 13% of patients, with the most common reactions (occurring in at least two patients) being colitis and general physical health deterioration.

About Libtayo

Libtayo is a fully-human monoclonal antibody targeting the immune checkpoint receptor PD-1 on T-cells. By binding to PD-1, Libtayo has been shown to block cancer cells from using the PD-1 pathway to suppress T-cell activation.

The recommended dose of Libtayo is 350 mg administered as an intravenous infusion over 30 minutes every three weeks, until disease progression or unacceptable toxicity. Libtayo is available as a single-dose 350 mg vial. No PD-L1 or tumor mutational burden (TMB) testing is required before starting treatment with Libtayo for advanced BCC.

In the U.S., the generic name for Libtayo in its approved indications is cemiplimab-rwlc, with rwlc as the suffix designated in accordance with Nonproprietary Naming of Biological Products Guidance for Industry issued by the FDA. Outside of the U.S., the generic name for Libtayo in its approved indication is cemiplimab.

About the Libtayo Development Program

Libtayo is currently under Priority Review by the FDA for advanced non-small cell lung cancer with ≥50% PD-L1 expression with a target action date of February 28, 2021. The European Medicines Agency (EMA) is assessing Libtayo in both advanced NSCLC with ≥50% PD-L1 expression and locally advanced BCC following treatment with a hedgehog inhibitor, and decisions from the European Commission are expected in mid-2021.

The extensive clinical program for Libtayo is focused on difficult-to-treat cancers. In skin cancer, this includes trials in adjuvant and neoadjuvant CSCC. Libtayo is also being investigated in pivotal trials in NSCLC (in combination with chemotherapy) and cervical cancer, as well as in trials combining Libtayo with either conventional or novel therapeutic approaches for both solid tumors and blood cancers. These potential uses are investigational, and their safety and efficacy have not been evaluated by any regulatory authority.

Libtayo is being jointly developed by Regeneron and Sanofi under a global collaboration agreement.

IMPORTANT SAFETY INFORMATION AND INDICATION FOR U.S. PATIENTS

What is LIBTAYO?

LIBTAYO is a prescription medicine used to treat people with a type of skin cancer called cutaneous squamous cell carcinoma (CSCC) that has spread or cannot be cured by surgery or radiation.

LIBTAYO is a prescription medicine used to treat people with a type of skin cancer called basal cell carcinoma that cannot be removed by surgery (locally advanced BCC) and have received treatment with an hedgehog pathway inhibitor (HHI), or cannot receive treatment with an HHI

LIBTAYO is a prescription medicine used to treat people with a type of skin cancer called basal cell carcinoma that has spread (metastatic BCC) and have received treatment with an hedgehog pathway inhibitor (HHI), or cannot receive treatment with an HHI. This use is approved based on how many patients responded to treatment and how long they responded. Studies are ongoing to provide additional information about clinical benefit.

It is not known if LIBTAYO is safe and effective in children.

What is the most important information I should know about LIBTAYO?

LIBTAYO is a medicine that may treat certain types of skin cancer by working with your immune system. LIBTAYO can cause your immune system to attack normal organs and tissues in any area of your body and can affect the way they work. These problems can sometimes become severe or life-threatening and can lead to death. You can have more than one of these problems at the same time. These problems may happen anytime during treatment or even after your treatment has ended.

Call or see your healthcare provider right away if you develop any new or worsening signs or symptoms, including:

• Lung problems: cough, shortness of breath, or chest pain
• Intestinal problems: diarrhea (loose stools) or more frequent bowel movements than usual, stools that are black, tarry, sticky or have blood or mucus, or severe stomach-area (abdomen) pain or tenderness
• Liver problems: yellowing of your skin or the whites of your eyes, severe nausea or vomiting, pain on the right side of your stomach area (abdomen), dark urine (tea colored), or bleeding or bruising more easily than normal
• Hormone gland problems: headache that will not go away or unusual headaches, eye sensitivity to light, eye problems, rapid heartbeat, increased sweating, extreme tiredness, weight gain or weight loss, feeling more hungry or thirsty than usual, urinating more often than usual, hair loss, feeling cold, constipation, your voice gets deeper, dizziness or fainting, or changes in mood or behavior, such as decreased sex drive, irritability, or forgetfulness
• Kidney problems: decrease in your amount of urine, blood in your urine, swelling of your ankles, or loss of appetite
• Skin problems: rash, itching, skin blistering or peeling, painful sores or ulcers in mouth or nose, throat, or genital area, fever or flu-like symptoms, or swollen lymph nodes
• Problems can also happen in other organs and tissues. These are not all of the signs and symptoms of immune system problems that can happen with LIBTAYO. Call or see your healthcare provider right away for any new or worsening signs or symptoms, which may include: chest pain, irregular heartbeat, shortness of breath or swelling of ankles, confusion, sleepiness, memory problems, changes in mood or behavior, stiff neck, balance problems, tingling or numbness of the arms or legs, double vision, blurry vision, sensitivity to light, eye pain, changes in eyesight, persistent or severe muscle pain or weakness, muscle cramps, low red blood cells, or bruising
• Infusion reactions that can sometimes be severe. Signs and symptoms of infusion reactions may include: chills or shaking, itching or rash, flushing, shortness of breath or wheezing, dizziness, feel like passing out, fever, back or neck pain, or facial swelling.
• Rejection of a transplanted organ. Your healthcare provider should tell you what signs and symptoms you should report and monitor you, depending on the type of organ transplant that you have had.
• Complications, including graft-versus-host disease (GVHD), in people who have received a bone marrow (stem cell) transplant that uses donor stem cells (allogeneic). These complications can be serious and can lead to death. These complications may happen if you underwent transplantation either before or after being treated with LIBTAYO. Your healthcare provider will monitor you for these complications.

Getting medical treatment right away may help keep these problems from becoming more serious. Your healthcare provider will check you for these problems during your treatment with LIBTAYO. Your healthcare provider may treat you with corticosteroid or hormone replacement medicines. Your healthcare provider may also need to delay or completely stop treatment with LIBTAYO if you have severe side effects.

Before you receive LIBTAYO, tell your healthcare provider about all your medical conditions, including if you:

• have immune system problems such as Crohn’s disease, ulcerative colitis, or lupus
• have received an organ transplant
• have received or plan to receive a stem cell transplant that uses donor stem cells (allogeneic)
• have a condition that affects your nervous system, such as myasthenia gravis or Guillain-Barré syndrome
• are pregnant or plan to become pregnant. LIBTAYO can harm your unborn baby
  ​Females who are able to become pregnant:
  • Your healthcare provider will give you a pregnancy test before you start treatment.
  • You should use an effective method of birth control during your treatment and for at least 4 months after your last dose of LIBTAYO. Talk with your healthcare provider about birth control methods that you can use during this time.
  • Tell your healthcare provider right away if you become pregnant or think you may be pregnant during treatment with LIBTAYO.
• are breastfeeding or plan to breastfeed. It is not known if LIBTAYO passes into your breast milk. Do not breastfeed during treatment and for at least 4 months after the last dose of LIBTAYO.

Tell your healthcare provider about all the medicines you take, including prescription and over- the-counter medicines, vitamins, and herbal supplements.

The most common side effects of LIBTAYO include tiredness, rash, diarrhea, muscle or bone pain, nausea, and itching. These are not all the possible side effects of LIBTAYO. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. You may also report side effects to Regeneron Pharmaceuticals and Sanofi at 1-877-542-8296.

Please see accompanying full Prescribing Information, including Medication Guide.

About Regeneron Pharmaceuticals, Inc.
Regeneron (NASDAQ: REGN) is a leading biotechnology company that invents life-transforming medicines for people with serious diseases. Founded and led for over 30 years by physician-scientists, our unique ability to repeatedly and consistently translate science into medicine has led to eight FDA-approved treatments and numerous product candidates in development, all of which were homegrown in our laboratories. Our medicines and pipeline are designed to help patients with eye diseases, allergic and inflammatory diseases, cancer, cardiovascular and metabolic diseases, pain, infectious diseases and rare diseases.

Regeneron is accelerating and improving the traditional drug development process through our proprietary VelociSuite® technologies, such as VelocImmune which uses unique genetically-humanized mice to produce optimized fully-human antibodies and bispecific antibodies, and through ambitious research initiatives such as the Regeneron Genetics Center, which is conducting one of the largest genetics sequencing efforts in the world.

For additional information about the company, please visit www.regeneron.com or follow @Regeneron on Twitter.