Cemiplimab

INDICATIONS AND USAGE LIBTAYO is a programmed death receptor-1 (PD-1) blocking antibody indicated: Cutaneous Squamous Cell Carcinoma (CSCC) for the treatment of adult patients with metastatic cutaneous squamous cell carcinoma (mCSCC) or locally advanced CSCC (laCSCC) who are not candidates for curative surgery or curative radiation. ( 1.1 ) for the adjuvant treatment of adult patients with CSCC at high risk of recurrence after surgery and radiation. ( 1.1 , 14.1 ) Basal Cell Carcinoma (BCC) for the treatment of adult patients with locally advanced or metastatic BCC (laBCC or mBCC) who have been previously treated with a hedgehog pathway inhibitor or for whom a hedgehog pathway inhibitor is not appropriate. ( 1.2 ) Non-Small Cell Lung Cancer (NSCLC) in combination with platinum‐based chemotherapy for the first‐line treatment of adult patients with non-small cell lung cancer (NSCLC) with no EGFR, ALK or ROS1 aberrations and is: locally advanced where patients are not candidates for surgical resection or definitive chemoradiation or metastatic. ( 1.3 ) as single agent for the first-line treatment of adult patients with NSCLC whose tumors have high PD-L1 expression [Tumor Proportion Score (TPS) ≥50%] as determined by an FDA-approved test, with no EGFR, ALK or ROS1 aberrations, and is: locally advanced where patients are not candidates for surgical resection or definitive chemoradiation or metastatic. ( 1.3 , 2.1 ) 1.1 Cutaneous Squamous Cell Carcinoma LIBTAYO is indicated for the treatment of adult patients with metastatic cutaneous squamous cell carcinoma (mCSCC) or locally advanced CSCC (laCSCC) who are not candidates for curative surgery or curative radiation. LIBTAYO is indicated for the adjuvant treatment of adult patients with CSCC at high risk of recurrence [see Clinical Studies (14.1) ] after surgery and radiation . 1.2 Basal Cell Carcinoma LIBTAYO is indicated for the treatment of adult patients with locally advanced or metastatic basal cell carcinoma (laBCC or mBCC) who have been previously treated with a hedgehog pathway inhibitor or for whom a hedgehog pathway inhibitor is not appropriate. 1.3 Non-Small Cell Lung Cancer LIBTAYO in combination with platinum‐based chemotherapy is indicated for the first‐line treatment of adult patients with non-small cell lung cancer (NSCLC) with no EGFR, ALK or ROS1 aberrations and is: locally advanced where patients are not candidates for surgical resection or definitive chemoradiation or metastatic. LIBTAYO as a single agent is indicated for the first-line treatment of adult patients with NSCLC whose tumors have high PD-L1 expression [Tumor Proportion Score (TPS) ≥50%] as determined by an FDA-approved test [see Dosage and Administration (2.1) ] , with no EGFR, ALK or ROS1 aberrations, and is: locally advanced where patients are not candidates for surgical resection or definitive chemoradiation or metastatic.

DOSAGE AND ADMINISTRATION Administer LIBTAYO as an intravenous infusion over 30 minutes after dilution. ( 2.2 ) Metastatic and locally advanced CSCC and BCC: 350 mg every 3 weeks until disease progression, unacceptable toxicity, or up to 24 months. ( 2.2 ) Adjuvant treatment of CSCC at high risk of recurrence after surgery and radiation: 350 mg every 3 weeks for 12 weeks followed by 700 mg every 6 weeks until disease recurrence, unacceptable toxicity, or up to 48 weeks of total therapy, or 350 mg every 3 weeks until disease recurrence, unacceptable toxicity, or up to 48 weeks of total therapy. ( 2.2 ) NSCLC: 350 mg every 3 weeks until disease progression or unacceptable toxicity. ( 2.2 ) 2.1 Patient Selection for NSCLC Select patients with locally advanced or metastatic NSCLC for treatment with LIBTAYO as a single agent based on PD-L1 expression on tumor cells [see Clinical Studies (14.3) ]. Information on FDA-approved tests for the detection of PD-L1 expression is available at: http://www.fda.gov/CompanionDiagnostics. 2.2 Recommended Dosage The recommended dosages of LIBTAYO are presented in Table 1. Refer to the Prescribing Information for the agents administered in combination with LIBTAYO for recommended dosing information, as appropriate. Table 1: Recommended Dosages of LIBTAYO as a Single Agent or in Combination with Other Agents Indication Recommended dosage of LIBTAYO as an intravenous infusion Duration of Treatment Adults with metastatic cutaneous squamous cell carcinoma (mCSCC) or locally advanced CSCC (laCSCC) 350 mg every 3 weeks Until disease progression, unacceptable toxicity, or up to 24 months. Adjuvant treatment of adult patients with CSCC at high risk of recurrence after surgery and radiation 350 mg every 3 weeks for 12 weeks, followed by 700 mg every 6 weeks Or 350 mg every 3 weeks Until disease recurrence, unacceptable toxicity, or up to 48 weeks. Adults with locally advanced basal cell carcinoma (laBCC) or metastatic BCC (mBCC) 350 mg every 3 weeks Until disease progression, unacceptable toxicity, or up to 24 months. Adults with non-small cell lung cancer (NSCLC) Single-agent or in combination with platinum-based chemotherapy 350 mg every 3 weeks Until disease progression or unacceptable toxicity. 2.3 Dosage Modifications for Adverse Reactions No dose reduction for LIBTAYO is recommended. In general, withhold LIBTAYO for severe (Grade 3) immune-mediated adverse reactions. Permanently discontinue LIBTAYO for life-threatening (Grade 4) immune-mediated adverse reactions, recurrent severe (Grade 3) immune-mediated reactions that require systemic immunosuppressive treatment, or an inability to reduce corticosteroid dose to 10 mg or less of prednisone equivalent per day within 12 weeks of initiating steroids. Dosage modifications for LIBTAYO for adverse reactions that require management different from these general guidelines are summarized in Table 2. Table 2: Recommended Dosage Modifications for Adverse Reactions Adverse Reaction Severity Based on National Cancer Institute Common Terminology Criteria for Adverse Events, Version 4.0 Dosage Modifications ALT=alanine aminotransferase, AST=aspartate aminotransferase, ULN=upper limit of normal, SJS=Stevens-Johnson Syndrome, TEN=toxic epidermal necrolysis, DRESS=Drug Rash with Eosinophilia and Systemic Symptoms Immune-Mediated Adverse Reactions [see Warnings and Precautions (5.1) ] Pneumonitis Grade 2 Withhold Resume in patients with complete or partial resolution (Grade 0 to 1) after corticosteroid taper. Permanently discontinue if no complete or partial resolution within 12 weeks of initiating steroids or inability to reduce prednisone to less than 10 mg per day (or equivalent) within 12 weeks of initiating steroids. Grade 3 or 4 Permanently discontinue Colitis Grade 2 or 3 Withhold Grade 4 Permanently discontinue Hepatitis with no tumor involvement of the liver AST or ALT increases to more than 3 and up to 8 times ULN or Total bilirubin increases to more than 1.5 and up to 3 times the ULN Withhold AST or ALT increases to more than 8 times the ULN or Total bilirubin increases to more than 3 times the ULN Permanently discontinue Hepatitis with tumor involvement of the liver If AST and ALT are less than or equal to ULN at baseline, withhold or permanently discontinue LIBTAYO based on recommendations for hepatitis with no liver involvement Baseline AST or ALT is more than 1 and up to 3 times ULN and increases to more than 5 and up to 10 times ULN or Baseline AST or ALT is more than 3 and up to 5 times ULN and increases to more than 8 and up to 10 times ULN Withhold AST or ALT increases to more than 10 times ULN or Total bilirubin increases to more than 3 times ULN Permanently discontinue Endocrinopathies Grade 3 or 4 Withhold until clinically stable or permanently discontinue depending on severity Nephritis with Renal Dysfunction Grade 2 or 3 increased blood creatinine Withhold Grade 4 increased blood creatinine Permanently discontinue Exfoliative Dermatologic Conditions Suspected SJS, TEN, or DRESS Withhold Confirmed SJS, TEN, or DRESS Permanently discontinue Myocarditis Grade 2, 3 or 4 Permanently discontinue Neurological Toxicities Grade 2 Withhold Grade 3 or 4 Permanently discontinue Other Adverse Reactions Infusion-related reactions [see Warnings and Precautions (5.2) ] Grade 1 or 2 Interrupt or slow the rate of infusion Grade 3 or 4 Permanently discontinue 2.4 Preparation and Administration Visually inspect for particulate matter and discoloration prior to administration. LIBTAYO is a clear to slightly opalescent, colorless to pale yellow solution that may contain trace amounts of translucent to white particles. Discard the vial if the solution is cloudy, discolored or contains extraneous particulate matter other than trace amounts of translucent to white particles. Preparation Do not shake the vial(s). Withdraw the required volume from the vial(s) of LIBTAYO and transfer into an intravenous (IV) bag containing 0.9% Sodium Chloride Injection, USP or 5% Dextrose Injection, USP to a final concentration between 1 mg/mL to 20 mg/mL. Mix diluted solution by gentle inversion. Do not shake. Discard any unused portion left in the vial(s). Storage of Diluted Solution Store at room temperature up to 25°C (77°F) for no more than 8 hours from the time of preparation to the end of the infusion or under refrigeration at 2°C to 8°C (36°F to 46°F) for no more than 10 days from the time of preparation to the end of infusion. Allow the diluted solution to come to room temperature prior to administration. Do not freeze. Administration Administer by intravenous infusion over 30 minutes through an intravenous line containing a sterile, in-line or add-on 0.2-micron to 5-micron filter.

WARNINGS AND PRECAUTIONS Immune-Mediated Adverse Reactions ( 5.1 ) Immune-mediated adverse reactions, which may be severe or fatal, can occur in any organ system or tissue, including the following: immune-mediated pneumonitis, immune-mediated colitis, immune-mediated hepatitis, immune-mediated endocrinopathies, immune-mediated dermatologic adverse reactions, immune-mediated nephritis and renal dysfunction, and solid organ transplant rejection. Monitor for early identification and management. Evaluate liver enzymes, creatinine, and thyroid function at baseline and periodically during treatment. Withhold or permanently discontinue LIBTAYO based on the severity of reaction. ( 2.3 ) Infusion-Related Reactions: Interrupt, slow the rate of infusion, or permanently discontinue based on severity of reaction. ( 2.3 , 5.2 ) Complications of Allogeneic Hematopoietic Stem Cell Transplantation (HSCT): Fatal and other serious complications can occur in patients who receive allogeneic HSCT before or after being treated with a PD-1/PD-L1 blocking antibody. ( 5.3 ) Embryo-Fetal Toxicity: Can cause fetal harm. Advise females of reproductive potential of the potential risk to a fetus and use of effective contraception. ( 5.4 , 8.1 , 8.3 ) 5.1 Severe and Fatal Immune-Mediated Adverse Reactions LIBTAYO is a monoclonal antibody that belongs to a class of drugs that bind to either the programmed death receptor-1 (PD-1) or PD-ligand 1 (PD-L1), blocking the PD-1/PD-L1 pathway, thereby removing inhibition of the immune response, potentially breaking peripheral tolerance and inducing immune-mediated adverse reactions. Important immune-mediated adverse reactions listed under Warnings and Precautions may not include all possible severe and fatal immune-mediated reactions. The incidence and severity of immune-mediated adverse reactions were similar when LIBTAYO was administered as a single agent or in combination with chemotherapy. Immune-mediated adverse reactions, which may be severe or fatal, can occur in any organ system or tissue. Immune-mediated adverse reactions can occur at any time after starting PD-1/PD-L1 blocking antibody. While immune-mediated adverse reactions usually manifest during treatment with PD-1/PD-L1 blocking antibodies, immune-mediated adverse reactions can also manifest after discontinuation of PD-1/PD-L1 blocking antibodies. Immune-mediated adverse reactions affecting more than one body system can occur simultaneously. Early identification and management of immune‐mediated adverse reactions are essential to ensure safe use of PD-1/PD-L1 blocking antibodies. Monitor closely for symptoms and signs that may be clinical manifestations of underlying immune-mediated adverse reactions. Evaluate liver enzymes, creatinine, and thyroid function at baseline and periodically during treatment. In cases of suspected immune-mediated adverse reactions, initiate appropriate workup to exclude alternative etiologies, including infection. Institute medical management promptly, including specialty consultation as appropriate. Withhold or permanently discontinue LIBTAYO depending on severity [see Dosage and Administration (2.3) ] . In general, if LIBTAYO requires interruption or discontinuation, administer systemic corticosteroid therapy (1 to 2 mg/kg/day prednisone or equivalent) until improvement to Grade 1 or less. Upon improvement to Grade 1 or less, initiate corticosteroid taper and continue to taper over at least 1 month. Consider administration of other systemic immunosuppressants in patients whose immune-mediated adverse reactions are not controlled with corticosteroids. Toxicity management guidelines for adverse reactions that do not necessarily require systemic steroids (e.g., endocrinopathies and dermatologic reactions) are discussed below. Immune-Mediated Pneumonitis LIBTAYO can cause immune-mediated pneumonitis. The definition of immune-mediated pneumonitis included the required use of systemic corticosteroids or other immunosuppressants and the absence of a clear alternate etiology. In patients treated with other PD-1/PD-L1 blocking antibodies the incidence of pneumonitis is higher in patients who have received prior thoracic radiation. Immune-mediated pneumonitis occurred in 2.6% (33/1281) of patients receiving LIBTAYO, including Grade 4 (0.3%), Grade 3 (0.6%), and Grade 2 (1.6%) adverse reactions. Pneumonitis led to permanent discontinuation of LIBTAYO in 1.3% of patients and withholding of LIBTAYO in 1.4% of the patients. Systemic corticosteroids were required in all patients with pneumonitis. Pneumonitis resolved in 61% of the 33 patients. Of the 18 patients in whom LIBTAYO was withheld for pneumonitis, 10 reinitiated LIBTAYO after symptom improvement; of these, 4/10 (40%) had recurrence of pneumonitis. Immune-Mediated Colitis LIBTAYO can cause immune-mediated colitis. The definition of immune-mediated colitis included the required use of systemic corticosteroids or other immunosuppressants and the absence of a clear alternate etiology. The primary component of the immune-mediated colitis was diarrhea. Cytomegalovirus (CMV) infection/reactivation has been reported in patients with corticosteroid-refractory immune-mediated colitis treated with PD-1/PD-L1 blocking antibodies. In cases of corticosteroid refractory colitis, consider repeating infectious workup to exclude alternative etiologies. Immune-mediated colitis occurred in 2% (25/1281) of patients receiving LIBTAYO, including Grade 3 (0.8%) and Grade 2 (0.9%) adverse reactions. Colitis led to permanent discontinuation of LIBTAYO in 0.4% of patients and withholding of LIBTAYO in 1.2% of patients. Systemic corticosteroids were required in all patients with colitis. Colitis resolved in 56% of the 25 patients. Of the 16 patients in whom LIBTAYO was withheld for colitis, 6 reinitiated LIBTAYO after symptom improvement; of these, 4/6 (67%) had recurrence of colitis. Immune-Mediated Hepatitis LIBTAYO can cause immune-mediated hepatitis. The definition of immune-mediated hepatitis included the required use of systemic corticosteroids or other immunosuppressants and the absence of a clear alternate etiology. Immune-mediated hepatitis occurred in 2.4% (31/1281) of patients receiving LIBTAYO, including fatal (< 0.1%), Grade 4 (0.3%), Grade 3 (1.6%), and Grade 2 (0.2%) adverse reactions. Hepatitis led to permanent discontinuation of LIBTAYO in 1.4% of patients and withholding of LIBTAYO in 0.7% of patients. Systemic corticosteroids were required in all patients with hepatitis. Thirteen percent (13%) of these patients (4/31) required additional immunosuppression with mycophenolate. Hepatitis resolved in 39% of the 31 patients. Of the 9 patients in whom LIBTAYO was withheld for hepatitis, 5 patients reinitiated LIBTAYO after symptom improvement; of these, 1/5 (20%) had recurrence of hepatitis. Immune-Mediated Endocrinopathies Adrenal Insufficiency LIBTAYO can cause primary or secondary adrenal insufficiency. For Grade 2 or higher adrenal insufficiency, initiate symptomatic treatment, including hormone replacement as clinically indicated. Withhold LIBTAYO depending on severity [see Dosage and Administration (2.3) ] . Adrenal insufficiency occurred in 0.5% (6/1281) of patients receiving LIBTAYO, including Grade 3 (0.5%) adverse reactions. Adrenal insufficiency led to permanent discontinuation of LIBTAYO in 1 (< 0.1%) patient. LIBTAYO was withheld in 1 (< 0.1%) patient due to adrenal insufficiency and not reinitiated. Systemic corticosteroids were required in 83% (5/6) patients with adrenal insufficiency; of these, the majority remained on systemic corticosteroids. Adrenal insufficiency resolved in 17% of the 6 patients. Hypophysitis LIBTAYO can cause immune-mediated hypophysitis. Hypophysitis can present with acute symptoms associated with mass effect such as headache, photophobia, or visual field defects. Hypophysitis can cause hypopituitarism. Initiate hormone replacement as clinically indicated. Withhold or permanen

CONTRAINDICATIONS None. None. ( 4 )

ADVERSE REACTIONS The following serious adverse reactions are described elsewhere in the labeling. Severe and Fatal Immune-Mediated Adverse Reactions [see Warnings and Precautions (5.1) ] Infusion-Related Reactions [see Warnings and Precautions (5.2) ] Complications of Allogeneic HSCT [see Warnings and Precautions (5.3) ] Most common adverse reactions (≥15%): LIBTAYO as a single agent in mCSCC or laCSCC, m BCC or laBCC, and NSCLC with high PD-L1 expression : Fatigue, musculoskeletal pain, rash, diarrhea, and anemia. ( 6.1 ) LIBTAYO as a single agent in adjuvant CSCC at high risk of recurrence: Rash and pruritus. ( 6.1 ) LIBTAYO in combination with platinum-based chemotherapy in NSCLC: Alopecia, musculoskeletal pain, nausea, fatigue, peripheral neuropathy, and decreased appetite. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Regeneron at 1-877-542-8296 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. The data described in Warnings and Precautions reflect exposure to LIBTAYO as a single agent in 1281 patients with advanced cancers in three open-label, single-arm, multicohort studies, and two open-label randomized multi-center studies. These studies included 384 patients with advanced CSCC (Studies 1540 and 1423), 138 patients with advanced BCC (Study 1620), 355 patients with NSCLC (Study 1624), and 404 patients with other advanced solid tumors. LIBTAYO was administered intravenously at doses of 3 mg/kg every 2 weeks (n=235), 350 mg every 3 weeks (n=1014), or other doses (n=32). Among the 1281 patients, 53% were exposed for 6 months or longer and 26% were exposed for one year or longer. In this pooled safety population, the most common adverse reactions (≥15%) were fatigue, musculoskeletal pain, rash, diarrhea, and anemia. The most common Grade 3-4 laboratory abnormalities (≥2%) were lymphopenia, anemia, hyponatremia, hypophosphatemia, increased aspartate aminotransferase, hypokalemia, hyperkalemia, and increased alanine aminotransferase. The data below also reflect exposure to LIBTAYO as a single agent (either 350 mg every 3 weeks for 12 weeks followed by 700 mg every 6 weeks for 36 weeks or 350 mg every 3 weeks for 48 weeks) in the adjuvant setting in 205 patients with CSCC at high risk of recurrence after treatment with surgery and radiation (C-POST study), and LIBTAYO 350 mg every 3 weeks in combination with platinum-based chemotherapy in 312 patients with NSCLC enrolled in a randomized, active controlled trial (Study 16113). Cutaneous Squamous Cell Carcinoma (CSCC) Study 1540 The safety of LIBTAYO was evaluated in 358 patients with advanced CSCC (metastatic or locally advanced disease) in Study 1540 [see Clinical Studies (14.1) ] . Of these 358 patients, 213 had mCSCC (nodal or distant) and 145 had laCSCC. Patients received LIBTAYO 3 mg/kg every 2 weeks (n=137) or 350 mg every 3 weeks (n=221) as an intravenous infusion until disease progression, unacceptable toxicity, or completion of planned treatment. The median duration of exposure was 40 weeks (1 week to 109 weeks). Serious adverse reactions occurred in 41% of patients. Serious adverse reactions that occurred in at least 2% of patients were pneumonia (3.6%), skin infection (3.6%), and pneumonitis (2.8%). Fatal adverse reactions occurred in 5% of patients who received LIBTAYO, including deaths due to infections (2.2%). Permanent discontinuation due to an adverse reaction occurred in 12% of patients. Adverse reactions resulting in permanent discontinuation in at least 2 patients were pneumonitis, rash, confusional state, general physical health deterioration, hemorrhage, liver function test abnormalities, and musculoskeletal pain. Dosage interruptions of LIBTAYO due to an adverse reaction occurred in 36% of patients. Adverse reactions which required dosage interruption in ≥2% of patients included diarrhea, infusion-related reaction, upper respiratory tract infection, liver function test abnormalities, musculoskeletal pain, pneumonitis, and rash. The most common (≥20%) adverse reactions were fatigue, rash, musculoskeletal pain, diarrhea, pruritus, and nausea. The most common Grade 3 or 4 adverse reactions (≥2%) were hypertension, skin infection, pneumonia, anemia, fatigue, musculoskeletal pain, and pneumonitis. The most common (≥4%) Grade 3 or 4 laboratory abnormalities worsening from baseline were lymphopenia, hyponatremia, anemia, and hypophosphatemia. Table 3 summarizes the adverse reactions that occurred in ≥10% of patients and Table 4 summarizes Grade 3 or 4 laboratory abnormalities worsening from baseline in ≥1% of patients receiving LIBTAYO. Table 3: Adverse Reactions in ≥10% of Patients with Advanced CSCC Receiving LIBTAYO in Study 1540 Adverse Reactions LIBTAYO N = 358 All Grades % Grades 3-4 % Toxicity was graded per National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) v.4.03 General and Administration Site Fatigue Fatigue is a composite term that includes fatigue and asthenia 38 2.2 Skin and Subcutaneous Tissue Rash Rash is a composite term that includes rash, rash maculo-papular, dermatitis, erythema, eczema, dermatitis bullous, rash erythematous, dermatitis acneiform, psoriasis, dermatitis contact, blister, pemphigoid, rash papular, hand dermatitis, skin exfoliation, autoimmune dermatitis, rash pruritic, rash macular, rash pustular, urticaria, dermatitis atopic, drug eruption, eczema asteatotic, skin reaction, dermatitis psoriasiform, eczema nummular, exfoliative rash, and immune-mediated dermatitis 34 1.7 Pruritus Pruritus is a composite term that includes pruritus and pruritus allergic 22 0.3 Actinic keratosis 10 0 Musculoskeletal and Connective Tissue Musculoskeletal pain Musculoskeletal pain is a composite term that includes arthralgia, back pain, myalgia, polyarthritis, pain in extremity, neck pain, non-cardiac chest pain, arthritis, musculoskeletal chest pain, musculoskeletal pain, musculoskeletal stiffness, bone pain, immune-mediated arthritis, and spinal pain 33 2.5 Gastrointestinal Diarrhea Diarrhea is a composite term that includes diarrhea, colitis, and autoimmune colitis 26 1.1 Nausea 21 0 Constipation 13 0.3 Vomiting Vomiting is a composite term that includes hematemesis and vomiting 11 0.6 Infections and infestations Upper respiratory tract infection Upper respiratory tract infection is a composite term that includes upper respiratory tract infection, nasopharyngitis, sinusitis, influenza-like illness, rhinitis, influenza, viral upper respiratory tract infection, respiratory tract infection, influenza A virus test positive, and pharyngitis 14 1.1 Skin infection Skin infection is a composite term that includes skin infection, cellulitis, fungal skin infection, and staphylococcal skin infection 11 4.5 Respiratory Cough Cough is a composite term that includes cough, productive cough, and upper airway cough syndrome 12 0 Metabolism and Nutrition Decreased appetite 11 0.6 Nervous system disorders Headache Headache is a composite term that includes headache, sinus headache, and migraine 10 0 Dizziness Dizziness is a composite term that includes dizziness, vertigo, vertigo positional, and dizziness postural 10 0.3 Table 4: Grade 3 or 4 Laboratory Abnormalities Worsening from Baseline in ≥1% of Patients with Advanced CSCC Receiving LIBTAYO in Study 1540 Laboratory Abnormality Grade 3-4 (%) Percentages are based on the number of patients with at least 1 post-baseline value available for that parameter Toxicity graded per NCI CTCAE v. 4.03 Hematology Lymphopenia 7.0 Anemia 4.1 Electrolytes Hyponatremia 4.9 Hypophosphatemia 4.1 Hypercalcemia 2.0 Hypokalemia 1.5 Coagulation Increased INR 2.9 Chemistry Increased aspartate aminotransferase 1.5 Hypoalbu

Mechanism of Action Binding of the PD-1 ligands PD-L1 and PD-L2 to the PD-1 receptor found on T cells inhibits T-cell proliferation and cytokine production. Upregulation of PD-1 ligands occurs in some tumors and signaling through this pathway can contribute to inhibition of active T-cell immune surveillance of tumors. Cemiplimab-rwlc is a recombinant human immunoglobulin G4 (IgG4) monoclonal antibody that binds to PD-1 and blocks its interaction with PD-L1 and PD-L2, releasing PD-1 pathway-mediated inhibition of the immune response, including the anti-tumor immune response. In syngeneic mouse tumor models, blocking PD-1 activity resulted in decreased tumor growth.