Enfortumab Vedotin

PADCEV ® , in combination with pembrolizumab or pembrolizumab and berahyaluronidase alfa-pmph, as neoadjuvant treatment and then continued after cystectomy as adjuvant treatment, is indicated for the treatment of adult patients with muscle invasive bladder cancer (MIBC). PADCEV ® , in combination with pembrolizumab or pembrolizumab and berahyaluronidase alfa-pmph, is indicated for the treatment of adult patients with locally advanced or metastatic urothelial cancer (la/mUC). PADCEV, as a single agent, is indicated for the treatment of adult patients with la/mUC who:

• have previously received a programmed death receptor-1 (PD-1) or programmed death-ligand 1 (PD-L1) inhibitor and platinum-containing chemotherapy, or
• are ineligible for cisplatin-containing chemotherapy and have previously received one or more prior lines of therapy. PADCEV is a Nectin-4-directed antibody and microtubule inhibitor conjugate indicated:
• in combination with pembrolizumab or pembrolizumab and berahyaluronidase alfa-pmph, as neoadjuvant treatment and then continued after cystectomy as adjuvant treatment, for the treatment of adult patients with muscle invasive bladder cancer (MIBC). ( 1 )
• in combination with pembrolizumab or pembrolizumab and berahyaluronidase alfa-pmph, for the treatment of adult patients with locally advanced or metastatic urothelial cancer (la/mUC). ( 1 )
• as a single agent for the treatment of adult patients with la/mUC who: ○ have previously received a programmed death receptor-1 (PD-1) or programmed death-ligand 1 (PD-L1) inhibitor and platinum-containing chemotherapy, or ○ are ineligible for cisplatin-containing chemotherapy and have previously received one or more prior lines of therapy. ( 1 )

For Injection: 20 mg and 30 mg of enfortumab vedotin-ejfv as a white to off-white lyophilized powder in a single-dose vial for reconstitution. For Injection: 20 mg and 30 mg of enfortumab vedotin-ejfv as a lyophilized powder in a single-dose vial for reconstitution. ( 3 )

None. None. ( 4 )

• Hyperglycemia: Diabetic ketoacidosis may occur in patients with and without preexisting diabetes mellitus, which may be fatal. Closely monitor blood glucose levels in patients with, or at risk for, diabetes mellitus or hyperglycemia. Withhold PADCEV if blood glucose is >250 mg/dL. ( 2.2 , 5.2 )
• Pneumonitis/Interstitial Lung Disease (ILD): Severe, life-threatening or fatal pneumonitis/ILD may occur. Withhold PADCEV for Grade 2 pneumonitis/ILD and consider dose reduction. Permanently discontinue PADCEV for Grade 3 or 4 pneumonitis/ILD. ( 2.2 , 5.3 )
• Peripheral Neuropathy: Monitor patients for new or worsening peripheral neuropathy and consider dose interruption, dose reduction, or discontinuation of PADCEV. ( 2.2 , 5.4 )
• Ocular Disorders: Ocular disorders, including vision changes, may occur. Monitor patients for signs or symptoms of ocular disorders. Consider prophylactic artificial tears for dry eyes and treatment with ophthalmic topical steroids after an ophthalmic exam. Consider dose interruption or dose reduction of PADCEV when symptomatic ocular disorders occur. ( 5.5 )
• Infusion Site Extravasation: Ensure adequate venous access prior to administration. Monitor the infusion site during PADCEV administration and stop the infusion immediately for suspected extravasation. ( 5.6 )
• Embryo-Fetal Toxicity: PADCEV can cause fetal harm. Advise of the potential risk to a fetus and to use effective contraception. ( 5.7 , 8.1 , 8.3 )

5.1 Skin Reactions Severe cutaneous adverse reactions, including fatal cases of SJS or TEN occurred in patients treated with PADCEV. SJS and TEN occurred predominantly during the first cycle of treatment but may occur later. Skin reactions occurred in 65% (all grades) of the 570 patients treated with PADCEV in combination with intravenous pembrolizumab for the treatment of MIBC in clinical trials. The majority of the skin reactions that occurred with combination therapy included rash and maculo-papular rash. Grade 3-4 skin reactions occurred in 13% of patients (Grade 3: 12%, Grade 4: 1.1%), including maculo-papular rash, rash, Stevens-Johnson syndrome, dermatitis, exfoliative generalized dermatitis, toxic skin eruption, acute generalized exanthematous pustulosis, bullous dermatitis, erythema, macular rash, and pruritic rash. A fatal reaction of TEN occurred in one patient (0.2%). The median time to onset of severe skin reactions was 0.6 months (range: 0.1 to 24 months). Skin reactions led to discontinuation of PADCEV in 8% of patients [see Adverse Reactions ( 6.1 )] . Of the patients who experienced a skin reaction and had data regarding resolution (n=367), 87% had complete resolution and 13% had residual skin reactions at their last evaluation. Of the patients with residual skin reactions at last evaluation, 31% (15/49) had Grade ≥2 skin reactions. Skin reactions occurred in 70% (all grades) of the 564 patients treated with PADCEV in combination with intravenous pembrolizumab for the treatment of la/mUC in clinical trials. When PADCEV was given in combination with intravenous pembrolizumab, the incidence of skin reactions, including severe events, occurred at a higher rate compared to PADCEV as a single agent. The majority of the skin reactions that occurred with combination therapy included maculo-papular rash, macular rash, and papular rash. Grade 3-4 skin reactions occurred in 17% of patients (Grade 3: 16%, Grade 4: 1%), including maculo-papular rash, bullous dermatitis, dermatitis, exfoliative dermatitis, pemphigoid, rash, erythematous rash, macular rash, and papular rash. A fatal reaction of bullous dermatitis occurred in one patient (0.2%). The median time to onset of severe skin reactions was 1.7 months (range: 0.1 to 17.2 months). Skin reactions led to discontinuation of PADCEV in 6% of patients [see Adverse Reactions ( 6.1 )] . Of the patients who experienced a skin reaction and had data regarding resolution (n=391), 59% had complete resolution and 41% had residual skin reactions at their last evaluation. Of the patients with residual skin reactions at last evaluation, 27% (43/159) had Grade ≥2 skin reactions. Skin reactions occurred in 58% (all grades) of the 720 patients treated with PADCEV as a single agent in clinical trials. Twenty-three percent (23%) of patients had maculo-papular rash and 34% had pruritus. Grade 3-4 skin reactions occurred in 14% of patients, including maculo-papular rash, erythematous rash, rash or drug eruption, symmetrical drug-related intertriginous and flexural exanthema (SDRIFE), bullous dermatitis, exfoliative dermatitis, and palmar-plantar erythrodysesthesia. The median time to onset of severe skin reactions was 0.6 months (range: 0.1 to 8 months). Among patients experiencing a skin reaction leading to dose interruption who then restarted PADCEV (n=75), 24% of patients restarting at the same dose and 24% of patients restarting at a reduced dose experienced recurrent severe skin reactions. Skin reactions led to discontinuation of PADCEV in 3.1% of patients [see Adverse Reactions ( 6.1 )] . Of the patients who experienced a skin reaction and had data regarding resolution (n=328), 58% had complete resolution and 42% had residual skin reactions at their last evaluation. Of the patients with residual skin reactions at last evaluation, 39% (53/137) had Grade ≥2 skin reactions. Monitor patients closely throughout treatment for skin reactions. Consider topical corticosteroids and antihistamines, as clinically indicated. For persistent or recurrent Grade 2 skin reactions, consider withholding PADCEV until Grade ≤1. Withhold PADCEV and refer for specialized care for suspected SJS, TEN or for Grade 3 skin reactions. Permanently discontinue PADCEV in patients with confirmed SJS or TEN; or Grade 4 or recurrent Grade 3 skin reactions [see Dosage and Administration ( 2.2 )] .

5.2 Hyperglycemia Hyperglycemia and diabetic ketoacidosis (DKA), including fatal events, occurred in patients with and without pre‑existing diabetes mellitus, treated with PADCEV. Patients with baseline hemoglobin A1C ≥8% were excluded from clinical trials. In clinical trials of PADCEV as a single agent, 17% of the 720 patients treated with PADCEV developed hyperglycemia of any grade; 7% of patients developed Grade 3-4 hyperglycemia (Grade 3: 6.5%, Grade 4: 0.6%). Fatal events of hyperglycemia and diabetic ketoacidosis occurred in one patient each (0.1%). The incidence of Grade 3-4 hyperglycemia increased consistently in patients with higher body mass index and in patients with higher baseline A1C. The median time to onset of hyperglycemia was 0.5 months (range: 0 to 20 months). Hyperglycemia led to discontinuation of PADCEV in 0.7% of patients [see Adverse Reactions ( 6.1 )] . Five percent (5%) of patients required initiation of insulin therapy for treatment of hyperglycemia. Of the patients who initiated insulin therapy for treatment of hyperglycemia, 66% (23/35) discontinued insulin by the time of last evaluation. Closely monitor blood glucose levels in patients with, or at risk for, diabetes mellitus or hyperglycemia. If blood glucose is elevated (>250 mg/dL), withhold PADCEV [see Dosage and Administration ( 2.2 )] .

5.3 Pneumonitis/Interstitial Lung Disease (ILD) Severe, life-threatening or fatal pneumonitis/ILD occurred in patients treated with PADCEV. When PADCEV was given in combination with intravenous pembrolizumab for the treatment of MIBC, 7% of the 570 patients treated with combination therapy had pneumonitis/ILD of any grade and 1.8% had Grade 3-4. The median time to onset of any grade pneumonitis/ILD was 3.2 months (range: 0.7 to 13 months). When PADCEV was given in combination with intravenous pembrolizumab for the treatment of la/mUC, 10% of the 564 patients treated with combination therapy had pneumonitis/ILD of any grade and 4% had Grade 3‑4. A fatal event of pneumonitis/ILD occurred in two patients (0.4%). […]

The following serious adverse reactions are described elsewhere in the labeling:

• Skin Reactions [see Boxed Warning , Warnings and Precautions ( 5.1 )]
• Hyperglycemia [see Warnings and Precautions ( 5.2 )]
• Pneumonitis/Interstitial Lung Disease (ILD) [see Warnings and Precautions ( 5.3 )]
• Peripheral Neuropathy [see Warnings and Precautions ( 5.4 )]
• Ocular Disorders [see Warnings and Precautions ( 5.5 )]
• Infusion Site Extravasation [see Warnings and Precautions ( 5.6 )] The most common adverse reactions, including laboratory abnormalities, (≥20%) were:
• PADCEV in combination with intravenous pembrolizumab for the treatment of MIBC: decreased hemoglobin, increased aspartate aminotransferase, increased alanine aminotransferase, rash, increased creatinine, decreased lymphocytes, fatigue, pruritus, decreased sodium, peripheral neuropathy, increased potassium, diarrhea, alopecia, dysgeusia, decreased appetite, nausea, constipation, urinary tract infection, dry eye, increased glucose, decreased weight, decreased potassium, hyperglycemia, decreased phosphate, and decreased neutrophils. ( 6.1 )
• PADCEV in combination with intravenous pembrolizumab for the treatment of la/mUC: increased aspartate aminotransferase, increased creatinine, rash, increased glucose, peripheral neuropathy, increased lipase, decreased lymphocytes, increased alanine aminotransferase, decreased hemoglobin, fatigue, decreased sodium, decreased phosphate, decreased albumin, pruritus, diarrhea, alopecia, decreased weight, decreased appetite, increased urate, decreased neutrophils, decreased potassium, dry eye, nausea, constipation, increased potassium, dysgeusia, urinary tract infection, and decreased platelets. ( 6.1 )
• PADCEV as a single agent: increased glucose, increased aspartate aminotransferase, decreased lymphocytes, increased creatinine, rash, fatigue, peripheral neuropathy, decreased albumin, decreased hemoglobin, alopecia, decreased appetite, decreased neutrophils, decreased sodium, increased alanine aminotransferase, decreased phosphate, diarrhea, nausea, pruritus, increased urate, dry eye, dysgeusia, constipation, increased lipase, decreased weight, decreased platelets, abdominal pain, and dry skin. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Astellas Pharma US, Inc. at 1-800-727-7003 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 safety population described in the WARNINGS AND PRECAUTIONS reflect exposure to PADCEV 1.25 mg/kg in combination with intravenous pembrolizumab for the treatment of MIBC in 570 patients in EV-303 (NCT03924895) and EV-304 (NCT04700124) and for the treatment of la/mUC in 564 patients in EV-302 (NCT04223856) and EV-103 (NCT03288545); PADCEV as a single agent at 1.25 mg/kg in 720 patients in EV-301 (NCT03474107), EV‑201 (NCT03219333), EV-203 (NCT04995419), EV-101 (NCT02091999), and EV-102 (NCT03070990). Ocular disorders reflect 384 patients in EV‑201, EV-101, and EV-102. Among 570 patients receiving PADCEV in combination with intravenous pembrolizumab for the treatment of MIBC, the most common (≥20%) adverse reactions, including laboratory abnormalities, were decreased hemoglobin, increased aspartate aminotransferase, increased alanine aminotransferase, rash, increased creatinine, decreased lymphocytes, fatigue, pruritus, decreased sodium, peripheral neuropathy, increased potassium, diarrhea, alopecia, dysgeusia, decreased appetite, nausea, constipation, urinary tract infection, dry eye, increased glucose, decreased weight, decreased potassium, hyperglycemia, decreased phosphate, and decreased neutrophils. Among 564 patients receiving PADCEV in combination with intravenous pembrolizumab for the treatment of la/mUC, 59% were exposed to PADCEV for ≥6 months, and 24% were exposed for ≥12 months. In this pooled population, the most common (≥20%) adverse reactions, including laboratory abnormalities, were increased aspartate aminotransferase, increased creatinine, rash, increased glucose, peripheral neuropathy, increased lipase, decreased lymphocytes, increased alanine aminotransferase, decreased hemoglobin, fatigue, decreased sodium, decreased phosphate, decreased albumin, pruritus, diarrhea, alopecia, decreased weight, decreased appetite, increased urate, decreased neutrophils, decreased potassium, dry eye, nausea, constipation, increased potassium, dysgeusia, urinary tract infection, and decreased platelets. Among 720 patients receiving PADCEV as a single agent, 37% were exposed for ≥6 months, and 14% were exposed for ≥12 months. In this pooled population, the most common (≥20%) adverse reactions, including laboratory abnormalities, were increased glucose, increased aspartate aminotransferase, decreased lymphocytes, increased creatinine, rash, fatigue, peripheral neuropathy, decreased albumin, decreased hemoglobin, alopecia, decreased appetite, decreased neutrophils, decreased sodium, increased alanine aminotransferase, decreased phosphate, diarrhea, nausea, pruritus, increased urate, dry eye, dysgeusia, constipation, increased lipase, decreased weight, decreased platelets, abdominal pain, and dry skin. The data described in the following section reflects exposure to PADCEV in combination with intravenous pembrolizumab from EV‑302, the dose escalation cohort, Cohort A and Cohort K of EV-103, EV-303, and EV-304. Patients from EV-302 and EV-103 received PADCEV 1.25 mg/kg in combination with intravenous pembrolizumab until disease progression or unacceptable toxicity. Patients from EV-303 and EV-304 received PADCEV 1.25 mg/kg in combination with intravenous pembrolizumab for 9 cycles or until disease progression or unacceptable toxicity. The data described in the following section also reflects exposure to PADCEV as a single agent from an open-label, randomized, trial (EV‑301) and Cohort 1 and Cohort 2 of an open-label, single arm, two cohort trial (EV-201). Patients received PADCEV 1.25 mg/kg until disease progression or unacceptable toxicity. Neoadjuvant and Adjuvant Treatment of Patients with MIBC Who Are Cisplatin-Eligible EV-304 The safety of PADCEV in combination with intravenous pembrolizumab as neoadjuvant treatment and continued after radical cystectomy (RC) as adjuvant treatment was evaluated in an open-label, randomized, active-controlled, multicenter trial (EV-304) in patients with previously untreated MIBC who were eligible for cisplatin-based chemotherapy. Patients received either PADCEV 1.25 mg/kg in combination with intravenous pembrolizumab (n=403) before and after RC with pelvic lymph node dissection (PLND) or chemotherapy (gemcitabine with cisplatin) before RC with PLND (n=396) [see Clinical Studies ( 14 )] . For the 403 patients who received PADCEV in the neoadjuvant phase, the median duration of exposure to PADCEV was 2.3 months (range: 0.03 to 4 months) and the median number of cycles of PADCEV was 4 (range: 1, 4) in the neoadjuvant phase. Out of 262 patients who received adjuvant treatment in the PADCEV in combination with pembrolizumab arm, 225 patients received PADCEV. The median duration of exposure to PADCEV was 3 months (range: 0.03 to 18.3 months) and the median number of cycles of PADCEV was 5 (range: 1, 5) for patients who received PADCEV in the adjuvant phase. Across the combined neoadjuvant and adjuvant phases (n=403), the median number of cycles of PADCEV was 6 (range: 1, 9) out of a planned 9 cycles. Table 5 summarizes the most common (≥20%) adverse reactions in EV-304. Table 5. […]

Concomitant use of dual P-gp and strong CYP3A4 inhibitors with PADCEV may increase the exposure to monomethyl auristatin E (MMAE). ( 7.1 )

7.1 Effects of Other Drugs on PADCEV Dual P-gp and Strong CYP3A4 Inhibitors Concomitant use with dual P-gp and strong CYP3A4 inhibitors may increase unconjugated MMAE exposure [see Clinical Pharmacology ( 12.3 )] , which may increase the incidence or severity of PADCEV toxicities. Closely monitor patients for signs of toxicity when PADCEV is given concomitantly with dual P-gp and strong CYP3A4 inhibitors.

Lactation: Advise women not to breastfeed. ( 8.2 )

8.1 Pregnancy Risk Summary Based on the mechanism of action and findings in animals, PADCEV can cause fetal harm when administered to a pregnant woman [see Clinical Pharmacology ( 12.1 )] . There are no available human data on PADCEV use in pregnant women to inform a drug-associated risk. In an animal reproduction study, administration of enfortumab vedotin-ejfv to pregnant rats during organogenesis caused maternal toxicity, embryo-fetal lethality, structural malformations, and skeletal anomalies at maternal exposures similar to the exposures at the recommended human dose of 1.25 mg/kg (see Data ) . Advise patients of the potential risk to the fetus. The background risk of major birth defects and miscarriage for the indicated population is unknown. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2%-4% and 15%-20%, respectively. Data Animal Data In a rat pilot embryo-fetal development study, administration of enfortumab vedotin-ejfv on gestation day 6 and 13 during the period of organogenesis resulted in a complete litter loss in all pregnant rats at the maternally toxic dose of 5 mg/kg (approximately 3 times the exposure at the recommended human dose). A dose of 2 mg/kg (similar to the exposure at the recommended human dose) resulted in maternal toxicity, embryo-fetal lethality, and structural malformations that included gastroschisis, malrotated hindlimb, absent forepaw, malpositioned internal organs, and fused cervical arch. Additionally, skeletal anomalies (asymmetric, fused, incompletely ossified, and misshapen sternebrae, misshapen cervical arch, and unilateral ossification of the thoracic centra) and decreased fetal weight were observed.

8.2 Lactation Risk Summary There are no data on the presence of enfortumab vedotin-ejfv in human milk, the effects on the breastfed child, or the effects on milk production. Because of the potential for serious adverse reactions in a breastfed child, advise lactating women not to breastfeed during treatment with PADCEV and for 3 weeks after the last dose.

8.3 Females and Males of Reproductive Potential Pregnancy Testing Verify pregnancy status in females of reproductive potential prior to initiating PADCEV treatment [see Use in Specific Populations ( 8.1 )] . Contraception Females PADCEV can cause fetal harm when administered to a pregnant woman [see Use in Specific Populations ( 8.1 )] . Advise females of reproductive potential to use effective contraception during treatment with PADCEV and for 2 months after the last dose. Males Advise male patients with female partners of reproductive potential to use effective contraception during treatment with PADCEV and for 4 months after the last dose. Infertility Females Based on findings in animal studies with MMAE-containing antibody-drug conjugates (ADCs), PADCEV may impair female fertility. The effect on fertility is reversible [see Nonclinical Toxicology ( 13.1 )] . Males Based on findings from animal studies, PADCEV may impair male fertility [see Nonclinical Toxicology ( 13.1 )] .

8.4 Pediatric Use Safety and effectiveness of PADCEV in pediatric patients have not been established.

8.5 Geriatric Use Of the 570 patients treated with PADCEV in combination with intravenous pembrolizumab for the treatment of MIBC, 45% (n=259) were 65-74 years and 22% (n=125) were 75 years or older. Of the 564 patients treated with PADCEV in combination with intravenous pembrolizumab for the treatment of la/mUC, 44% (n=247) were 65‑74 years and 26% (n=144) were 75 years or older. Of the 720 patients treated with PADCEV as a single agent in clinical trials, 39% (n=282) were 65‑74 years and 24% (n=170) were 75 years or older. No overall differences in effectiveness were observed between patients 65 years of age or older and younger patients. Patients 75 years of age or older treated with PADCEV in combination with intravenous pembrolizumab for the treatment of MIBC experienced a higher incidence of fatal adverse reactions than younger patients. The incidence of fatal adverse reactions was 3.6% in patients younger than 75 and 11% in patients 75 years or older. Patients 75 years of age or older treated with PADCEV in combination with intravenous pembrolizumab for the treatment of la/mUC experienced a higher incidence of fatal adverse reactions than younger patients. The incidence of fatal adverse reactions was 4% in patients younger than 75 and 7% in patients 75 years or older. Patients 75 years of age or older treated with PADCEV as a single agent experienced a higher incidence of fatal adverse reactions than younger patients. The incidence of fatal adverse reactions was 6% in patients younger than 75 years, and 11% in patients 75 years or older. No significant difference was observed in the pharmacokinetics of PADCEV between patients 65 years and older and younger patients [see Clinical Pharmacology ( 12.3 )].

8.6 Hepatic Impairment Avoid the use of PADCEV in patients with moderate or severe hepatic impairment (total bilirubin >1.5 × ULN and any AST). PADCEV has only been studied in a limited number of patients with moderate or severe hepatic impairment [see Clinical Pharmacology ( 12.3 )] . In another ADC that contains MMAE, the frequency of ≥ Grade 3 adverse reactions and deaths was greater in patients with moderate (Child-Pugh B) or severe (Child-Pugh C) hepatic impairment compared to patients with normal hepatic function.

Enfortumab vedotin-ejfv is an ADC. The antibody is a human IgG1 kappa directed against Nectin-4, an adhesion protein located on the surface of cells. The small molecule, MMAE, is a microtubule-disrupting agent, attached to the antibody via a protease-cleavable linker. Nonclinical data suggest that the anticancer activity of enfortumab vedotin-ejfv is due to the binding of the ADC to Nectin-4-expressing cells, followed by internalization of the ADC-Nectin-4 complex, and the release of MMAE via proteolytic cleavage. Release of MMAE disrupts the microtubule network within the cell, subsequently inducing cell cycle arrest and apoptosis. The combination of enfortumab vedotin-ejfv with a PD-1 blocking antibody resulted in up-regulation of immune function and increased anti-tumor activity in syngeneic mouse tumor models expressing Nectin-4.