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PADCEV™
(enfortumab vedotin-ejfv) for Injection, for Intravenous Use
Enfortumab vedotin-ejfv is a Nectin-4 directed antibody-drug conjugate (ADC) comprised of a fully human anti-Nectin-4 IgG1 kappa monoclonal antibody (AGS-22C3) conjugated to the small molecule microtubule disrupting agent, monomethyl auristatin E (MMAE) via a protease-cleavable maleimidocaproyl valine-citrulline (vc) linker (SGD-1006). Conjugation takes place on cysteine residues that comprise the interchain disulfide bonds of the antibody to yield a product with a drug-to-antibody ratio of approximately 3.8:1. The molecular weight is approximately 152 kDa.
Figure 1: Structural Formula
 |
Approximately 4 molecules of MMAE are attached to each antibody molecule. Enfortumab vedotin-ejfv is produced by chemical conjugation of the antibody and small molecule components. The antibody is produced by mammalian (Chinese hamster ovary) cells and the small molecule components are produced by chemical synthesis.
PADCEV (enfortumab vedotin-ejfv) for injection is provided as a sterile, preservative-free, white to off-white lyophilized powder in single-dose vials for intravenous use. PADCEV is supplied as a 20 mg per vial and a 30 mg per vial and requires reconstitution with Sterile Water for Injection, USP, (2.3 mL and 3.3 mL, respectively) resulting in a clear to slightly opalescent, colorless to slightly yellow solution with a final concentration of 10 mg/mL [see DOSAGE AND ADMINISTRATION]. After reconstitution, each vial allows the withdrawal of 2 mL (20 mg) and 3 mL (30 mg). Each mL of reconstituted solution contains 10 mg of enfortumab vedotin-ejfv, histidine (1.4 mg), histidine hydrochloride monohydrate (2.31 mg), polysorbate 20 (0.2 mg) and trehalose dihydrate (55 mg) with a pH of 6.0.
The following serious adverse reactions are described elsewhere in the labeling:
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 in the WARNINGS AND PRECAUTIONS section reflect exposure to PADCEV as a single agent at 1.25 mg/kg in 310 patients in EV-201, EV-101 (NCT02091999), and EV-102 (NCT03219333). Among 310 patients receiving PADCEV, 30% were exposed for ≥ 6 months and 8% were exposed for ≥12 months.
The data described in this section reflect exposure to PADCEV from EV-201, a single arm study in patients (n=125) with locally advanced or metastatic urothelial cancer who had received prior treatment with a PD-1 or PD-L1 inhibitor and platinum-based chemotherapy. Patients received PADCEV 1.25 mg/kg on Days 1, 8 and 15 of a 28-day cycle until disease progression or unacceptable toxicity. The median duration of exposure to PADCEV was 4.6 months (range: 0.5-15.6).
Serious adverse reactions occurred in 46% of patients treated with PADCEV. The most common serious adverse reactions (≥3%) were urinary tract infection (6%), cellulitis (5%), febrile neutropenia (4%), diarrhea (4%), sepsis (3%), acute kidney injury (3%), dyspnea (3%), and rash (3%). Fatal adverse reactions occurred in 3.2% of patients, including acute respiratory failure, aspiration pneumonia, cardiac disorder, and sepsis (each 0.8%).
Adverse reactions leading to discontinuation occurred in 16% of patients; the most common adverse reaction leading to discontinuation was peripheral neuropathy (6%). Adverse reactions leading to dose interruption occurred in 64% of patients; the most common adverse reactions leading to dose interruption were peripheral neuropathy (18%), rash (9%) and fatigue (6%). Adverse reactions leading to dose reduction occurred in 34% of patients; the most common adverse reactions leading to dose reduction were peripheral neuropathy (12%), rash (6%) and fatigue (4%).
The most common adverse reactions (≥20%) were fatigue, peripheral neuropathy, decreased appetite, rash, alopecia, nausea, dysgeusia, diarrhea, dry eye, pruritus and dry skin. The most common Grade ≥3 adverse reaction (≥5%) were rash, diarrhea, and fatigue.
Table 3 summarizes the all grade and Grade ≥3 adverse reactions reported in patients in EV-201.
Table 3: Adverse Reactions Reported in ≥15% (Any Grade) or ≥5% (Grade ≥3) of Patients Treated with PADCEV in EV-201
| Adverse Reaction | PADCEV n=125 | |
| All Grades % | Grade ≥3 % | |
| Any | 100 | 73 |
| General disorders and administration site conditions | ||
| Fatigue* | 56 | 6 |
| Nervous system disorders | ||
| Peripheral neuropathy† | 56 | 4 |
| Dysgeusia | 42 | 0 |
| Metabolism and nutrition disorders | ||
| Decreased appetite | 52 | 2 |
| Skin and subcutaneous tissue disorders | ||
| Rash‡ | 52 | 13 |
| Alopecia | 50 | 0 |
| Dry skin | 26 | 0 |
| Pruritus§ | 26 | 2 |
| Eye disorders | ||
| Dry eye¶ | 40 | 0 |
| Gastrointestinal disorders | ||
| Nausea | 45 | 3 |
| Diarrhea# | 42 | 6 |
| Vomiting | 18 | 2 |
| *Includes: asthenia and fatigue †Includes: hypoesthesia, gait disturbance, muscular weakness, neuralgia, paresthesia, peripheral motor neuropathy, peripheral sensory neuropathy and peripheral sensorimotor neuropathy. ‡Includes: dermatitis acneiform, dermatitis bullous, dermatitis contact, dermatitis exfoliative, drug eruption, erythema, erythema multiforme, exfoliative rash, palmar-plantar erythrodysesthesia syndrome, photosensitivity reaction, rash, rash erythematous, rash generalized, rash macular, rash maculo-papular, rash papular, rash pustular, rash pruritic, rash vesicular, skin exfoliation, stasis dermatitis, and symmetrical drug-related intertriginous and flexural exanthema (SDRIFE) and urticaria. §Includes: pruritus and pruritus generalized ¶Includes: blepharitis, conjunctivitis, dry eye, eye irritation, keratitis, keratopathy, lacrimation increased, limbal stem cell deficiency, Meibomian gland dysfunction, ocular discomfort, punctate keratitis, tear break up time decreased #Includes: colitis, diarrhea and enterocolitis | ||
Other clinically significant adverse reactions (≤15%) include: herpes zoster (3%) and infusion site extravasation (2%).
Table 4: Selected Laboratory Abnormalities Reported in ≥ 10% (Grades 2-4) or ≥ 5% (Grade 3-4) of Patients Treated with PADCEV in EV-201
| Adverse Reaction | PADCEV | |
| Grades 2-4* % | Grade 3-4* % | |
| Hematology | ||
| Hemoglobin decreased | 34 | 10 |
| Lymphocytes decreased | 32 | 10 |
| Neutrophils decreased | 14 | 5 |
| Leukocytes decreased | 14 | 4 |
| Chemistry | ||
| Phosphate decreased | 34 | 10 |
| Creatinine increased | 20 | 2 |
| Potassium decreased | 19† | 1 |
| Lipase increased | 14 | 9 |
| Glucose increased | -‡ | 8 |
| Sodium decreased | 8 | 8 |
| Urate increased | 7 | 7 |
| *Denominator for each laboratory parameter is based on the number of patients with a baseline and posttreatment laboratory value available for 121 or 122 patients. †Includes Grade 1 (potassium 3.0-3.5 mmol/L) - Grade 4. ‡CTCAE Grade 2 is defined as fasting glucose >160-250 mg/dL. Fasting glucose levels were not measured in EV-201. However, 23 (19%) patients had non-fasting glucose >160-250 mg/dL. | ||
As with all therapeutic proteins, there is a potential for immunogenicity. The detection of antibody formation is highly dependent on the sensitivity and specificity of the assay. Additionally, the observed incidence of antibody (including neutralizing antibody) positivity in an assay may be influenced by several factors including assay methodology, sample handling, timing of sample collection, concomitant medications, and underlying disease. For these reasons, comparison of the incidence of antibodies in the studies described below with the incidence of antibodies in other studies or other enfortumab vedotin products may be misleading.
A total of 365 patients were tested for immunogenicity to PADCEV; 4 patients (1%) were confirmed to be transiently positive for anti-therapeutic antibody (ATA), and 1 patient (0.3%) was confirmed to be persistently positive for ATA at any post-baseline time point. No impact of ATA on efficacy, safety and pharmacokinetics was observed.
Concomitant use with a strong CYP3A4 inhibitor may increase free MMAE exposure [see CLINICAL PHARMACOLOGY], which may increase the incidence or severity of PADCEV toxicities. Closely monitor patients for signs of toxicity when PADCEV is given concomitantly with strong CYP3A4 inhibitors.
Included as part of the PRECAUTIONS section.
Hyperglycemia occurred in patients treated with PADCEV, including death, and diabetic ketoacidosis (DKA) in those with and without pre-existing diabetes mellitus. The incidence of Grade 3-4 hyperglycemia increased consistently in patients with higher body mass index and in patients with higher baseline A1C. In EV-201, 8% of patients developed Grade 3-4 hyperglycemia. In this trial, patients with baseline hemoglobin A1C ≥8% were excluded. 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].
Peripheral neuropathy, predominantly sensory, occurred in 49% of the 310 patients treated with PADCEV in clinical trials; 2% experienced Grade 3 reactions.
In study EV-201, peripheral neuropathy occurred in patients treated with PADCEV with or without preexisting peripheral neuropathy. The median time to onset of Grade ≥2 was 3.8 months (range: 0.6 to 9.2). Neuropathy led to treatment discontinuation in 6% of patients. At the time of their last evaluation, 19% had complete resolution, and 26% had partial improvement.
Monitor patients for symptoms of new or worsening peripheral neuropathy and consider dose interruption or dose reduction of PADCEV when peripheral neuropathy occurs. Permanently discontinue PADCEV in patients that develop Grade ≥3 peripheral neuropathy [see DOSAGE AND ADMINISTRATION].
Ocular disorders occurred in 46% of the 310 patients treated with PADCEV. The majority of these events involved the cornea and included keratitis, blurred vision, limbal stem cell deficiency and other events associated with dry eyes.
Dry eye symptoms occurred in 36% of patients, and blurred vision occurred in 14% of patients, during treatment with PADCEV. The median time to onset to symptomatic ocular disorder was 1.9 months (range: 0.3 to 6.2).
Monitor patients for ocular disorders. Consider artificial tears for prophylaxis of dry eyes and ophthalmologic evaluation if ocular symptoms occur or do not resolve. Consider treatment with ophthalmic topical steroids, if indicated after an ophthalmic exam. Consider dose interruption or dose reduction of PADCEV for symptomatic ocular disorders.
Skin reactions occurred in 54% of the 310 patients treated with PADCEV in clinical trials. Twenty-six percent (26%) of patients had maculopapular rash and 30% had pruritus. Grade 3-4 skin reactions occurred in 10% of patients and included symmetrical drug-related intertriginous and flexural exanthema (SDRIFE), bullous dermatitis, exfoliative dermatitis, and palmar-plantar erythrodysesthesia.
In study EV-201, the median time to onset of severe skin reactions was 0.8 months (range: 0.2 to 5.3). Of the patients who experienced rash, 65% had complete resolution and 22% had partial improvement.
Monitor patients for skin reactions. Consider appropriate treatment, such as topical corticosteroids and antihistamines for skin reactions, as clinically indicated. For severe (Grade 3) skin reactions, withhold PADCEV until improvement or resolution and administer appropriate medical treatment. Permanently discontinue PADCEV in patients that develop Grade 4 or recurrent Grade 3 skin reactions [see DOSAGE AND ADMINISTRATION].
Skin and soft tissue reactions secondary to extravasation have been observed after administration of PADCEV. Of the 310 patients, 1.3% of patients experienced skin and soft tissue reactions. Reactions may be delayed. Erythema, swelling, increased temperature, and pain worsened until 2-7 days after extravasation and resolved within 1-4 weeks of peak. One percent of patients developed extravasation reactions with secondary cellulitis, bullae, or exfoliation. Ensure adequate venous access prior to starting PADCEV and monitor for possible extravasation during administration. If extravasation occurs, stop the infusion and monitor for adverse reactions.
Based on the mechanism of action and findings in animals, PADCEV can cause fetal harm when administered to a pregnant woman. In animal reproduction studies, administration of enfortumab vedotin to pregnant rats during the period of organogenesis caused maternal toxicity, embryo-fetal lethality, structural malformations and skeletal anomalies at maternal exposures approximately similar to the clinical exposures at the recommended human dose of 1.25 mg/kg.
Advise patients of the potential risk to the fetus. Advise female patients of reproductive potential to use effective contraception during treatment with PADCEV and for 2 months after the last dose. 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 [see Use In Specific Populations and CLINICAL PHARMACOLOGY].
Advise the patient to read the FDA-approved patient labeling (PATIENT INFORMATION).
Inform patients about the risk of hyperglycemia and how to recognize associated symptoms [see WARNINGS AND PRECAUTIONS].
Inform patients to report to their healthcare provider any numbness and tingling of the hands or feet or muscle weakness [see WARNINGS AND PRECAUTIONS].
Advise patients to contact their healthcare provider if they experience any visual changes [see WARNINGS AND PRECAUTIONS]. In order to prevent or treat dry eyes, advise patients to use artificial tear substitutes.
Inform patients that rashes and severe skin reactions have occurred after administration of PADCEV. Advise patients to contact their healthcare provider for signs and symptoms of progressive or intolerable skin reactions [see WARNINGS AND PRECAUTIONS].
Inform patients that infusion site reactions have occurred after administration of PADCEV. These reactions generally occurred immediately after administration but, in some instances, had a delayed onset (e.g., 24 hours). Instruct patients to contact their healthcare provider immediately if they experience an infusion site reaction [see WARNINGS AND PRECAUTIONS].
Advise pregnant women and females of reproductive potential of the potential risk to the fetus. Advise females to inform their healthcare providers of a known or suspected pregnancy [see WARNINGS AND PRECAUTIONS and Use In Specific Population].
Advise female patients of reproductive potential to use effective contraception during treatment with PADCEV and for 2 months after the last dose. 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 [see Use In Specific Populations].
Advise women not to breastfeed during treatment with PADCEV and for 3 weeks after the last dose [see Use In Specific Populations].
Advise males of reproductive potential that PADCEV may impair fertility [see Use In Specific Populations].
Carcinogenicity studies with enfortumab vedotin-ejfv or the small molecule cytotoxic agent (MMAE) have not been conducted.
MMAE was genotoxic in the rat bone marrow micronucleus study through an aneugenic mechanism. This effect is consistent with the pharmacological effect of MMAE as a microtubule-disrupting agent. MMAE was not mutagenic in the bacterial reverse mutation assay (Ames test) or the L5178Y mouse lymphoma forward mutation assay.
Fertility studies with enfortumab vedotin-ejfv or MMAE have not been conducted. However, results of repeatdose toxicity studies in rats indicate the potential for enfortumab vedotin-ejfv to impair male reproductive function and fertility.
In repeat-dose toxicology studies conducted in rats for up to 13 weeks, doses ≥2 mg/kg enfortumab vedotin-ejfv (at exposures similar to the exposures at the recommended human dose) resulted in decreases in testes and epididymis weights, seminiferous tubule degeneration, spermatid/spermatocyte depletion in the testes and cell debris, sperm granuloma and hypospermia/abnormal spermatids in the epididymis. Findings in the testes and epididymis did not reverse by the end of the recovery period.
Based on the mechanism of action and findings in animals, PADCEV can cause fetal harm when administered to a pregnant woman [see CLINICAL PHARMACOLOGY]. 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 approximately 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.
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 (approximately 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.
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 at least 3 weeks after the last dose.
Verify pregnancy status in females of reproductive potential prior to initiating PADCEV treatment [see Use In Specific Populations].
Females
PADCEV can cause fetal harm when administered to a pregnant woman [see Use In Specific Populations]. 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.
Males
Based on findings from animal studies, PADCEV may impair male fertility [see Nonclinical Toxicology].
Safety and effectiveness of PADCEV in pediatric patients have not been established.
Of the 310 patients treated with PADCEV in clinical studies, 187 (60%) were 65 years or older and 80 (26%) were 75 years or older. No overall differences in safety or effectiveness were observed between these patients and younger patients [see CLINICAL PHARMACOLOGY].
Avoid the use of PADCEV in patients with moderate or severe hepatic impairment. PADCEV has not been studied in patients with moderate or severe hepatic impairment [see CLINICAL PHARMACOLOGY]. 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. No adjustment in the starting dose is required when administering PADCEV to patients with mild hepatic impairment.
No dose adjustment is required in patients with mild (CrCL >60-90 mL/min), moderate (CrCL 30-60 mL/min) or severe (CrCL <30 mL/min) renal impairment [see CLINICAL PHARMACOLOGY].
No Information provided
None.
Enfortumab vedotin-ejfv is an ADC. The antibody is a human IgG1 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 apoptotic cell death.
In an exposure-response analysis, higher enfortumab vedotin exposure was associated with higher incidence of some adverse reactions (e.g., Grade ≥2 peripheral neuropathy, Grade ≥3 hyperglycemia) and a lower exposure was associated with lower efficacy.
At the recommended dose, PADCEV had no large QTc prolongation (>20 msec).
Population pharmacokinetic analysis included data from 369 patients based on three Phase 1 studies and one Phase 2 study. Enfortumab vedotin-ejfv pharmacokinetics were characterized after single and multiple doses in patients with locally advanced or metastatic urothelial carcinoma and other solid tumors.
The exposure parameters of ADC and unconjugated MMAE (the cytotoxic component of enfortumab vedotinejfv) are summarized in Table 5 below. Peak ADC concentrations were observed near the end of intravenous infusion while peak MMAE concentrations were observed approximately 2 days after enfortumab vedotin-ejfv dosing. Minimal accumulation of the ADC and MMAE was observed following repeat administration of enfortumab vedotin-ejfv in patients. Steady-state concentrations of ADC and MMAE were reached after 1 treatment cycle.
Table 5: Exposure parameters of ADC and unconjugated MMAE after first treatment cycle of 1.25 mg/kg of enfortumab vedotin-ejfv dose of Days 1, 8 and 15
| ADC Mean (± SD) | Unconjugated MMAE Mean (± SD) | |
| Cmax | 28 (6.8) μg/mL | 4.8 (2.7) ng/mL |
| AUC0-28d | 111 (38) μg•d/mL | 69 (42) ng•d/mL |
| Ctrough,0-28d | 0.27 (0.22) μg/mL | 0.57 (0.58) ng/mL |
| Cmax = maximum concentration, AUC0-28d = area under the concentration-time curve from time zero to 28 days, Ctrough,0-28d = pre-dose concentration on day 28 | ||
The estimated mean steady-state volume of distribution of ADC was 11 liters following administration of enfortumab vedotin-ejfv. Plasma protein binding of MMAE ranged from 68% to 82%, in vitro.
ADC and MMAE exhibited multi-exponential declines with an elimination half-life of 3.4 days and 2.4 days, respectively. The mean clearance (CL) of enfortumab vedotin-ejfv and free MMAE in patients was 0.10 L/h and 2.7 L/h, respectively, in patients. Elimination of MMAE appeared to be limited by its rate of release from enfortumab vedotin-ejfv.
Enfortumab vedotin-ejfv catabolism has not been studied in humans; however, it is expected to undergo catabolism to small peptides, amino acids, unconjugated MMAE, and unconjugated MMAE-related catabolites.
Enfortumab vedotin-ejfv releases MMAE via proteolytic cleavage, and MMAE is primarily metabolized by CYP3A4 in vitro.
The excretion of enfortumab vedotin-ejfv is not fully characterized. Following a single-dose of another ADC that contains MMAE, 17% of the total MMAE administered was recovered in feces and 6% in urine over a 1- week period, primarily as unchanged drug. A similar excretion profile of MMAE is expected after enfortumab vedotin-ejfv administration.
Based on population pharmacokinetic analysis, no clinically significant differences in the pharmacokinetics of enfortumab vedotin-ejfv were observed based on age (24 to 87 years), sex, or race/ethnicity (Caucasian, Asian, Black, or others).
Based on population pharmacokinetics analysis, there was a 48% AUC increase in unconjugated MMAE exposure observed in patients with mild hepatic impairment (bilirubin of 1 to 1.5 × ULN and AST <ULN, or bilirubin ≤ULN and AST >ULN, n=31) compared to normal hepatic function. The effect of moderate or severe hepatic impairment (AST or ALT >2.5 x ULN or total bilirubin >1.5 x ULN) or liver transplantation on the pharmacokinetics of ADC or unconjugated MMAE is unknown.
The pharmacokinetics of enfortumab vedotin-ejfv and MMAE were evaluated after the administration of 1.25 mg/kg of enfortumab vedotin-ejfv to patients with mild (creatinine clearance; CrCL >60–90 mL/min; n=135), moderate (CrCL 30–60 mL/min; n=147) and severe (CrCL <30 mL/min; n=8) renal impairment. No significant differences in exposure (AUC) of ADC and MMAE were observed in patients with mild, moderate or severe renal impairment compared to patients with normal renal function. The effect of end stage renal disease with or without dialysis on the pharmacokinetics of ADC or unconjugated MMAE is unknown.
No clinical studies evaluating the drug-drug interaction potential of enfortumab vedotin-ejfv have been conducted. To characterize the drug-drug interaction potential of free MMAE, clinical studies with another ADC that contains MMAE are described below.
Another ADC that contains MMAE co-administered with ketoconazole (a strong CYP3A4 inhibitor) increased MMAE Cmax by 25% and AUC by 34%, with no change in ADC exposure. The concomitant use of strong inhibitors of CYP3A4 with PADCEV would likely result in similar effects on free MMAE and ADC.
Another ADC that contains MMAE co-administered with rifampin (a strong CYP3A4 inducer) decreased MMAE Cmax by 44% and AUC by 46%, with no change in ADC exposure. The concomitant use of strong inducers of CYP3A4 with PADCEV would likely result in similar effects on free MMAE and ADC.
Another ADC that contains MMAE co-administered with midazolam (a sensitive CYP3A4 substrate) did not affect the exposure of midazolam. Similarly, PADCEV is not expected to alter the exposure of drugs that are metabolized by CYP3A4 enzymes.
Transporter Systems: MMAE is a substrate of P-glycoprotein (P-gp), but not an inhibitor of P-gp.
The efficacy of PADCEV was evaluated in EV-201 (NCT03219333), single-arm, multicenter trial that enrolled 125 patients with locally advanced or metastatic urothelial cancer who received prior treatment with a PD-1 or PD-L1 inhibitor and platinum-based chemotherapy. Patients were excluded if they had active CNS metastases, ongoing sensory or motor neuropathy ≥ Grade 2, or uncontrolled diabetes defined as hemoglobin A1C (HbA1c) ≥8% or HbA1c ≥7% with associated diabetes symptoms.
The median age was 69 years (range: 40 to 84 years), 70% were male, and 85% were Caucasian. All patients had a baseline Eastern Cooperative Oncology Group (ECOG) performance status of 0 (32%) or 1 (68%). Ninety percent of patients had visceral metastases including 40% with liver metastases. Two-thirds of patients had pure transitional cell carcinoma (TCC) histology; 33% had TCC with other histologic variants. An immunohistochemistry clinical trial assay was used to assess patients with tumor tissue available, and detected Nectin-4 expression in all patients tested (n=120). The median number of prior systemic therapies was 3 (range: 1 to 6). Forty-six percent of patients received prior PD-1 inhibitor, 42% received prior PD-L1 inhibitor, and an additional 13% received both PD-1 and PD-L1 inhibitors. Sixty-six percent of patients received prior cisplatinbased regimens, 26% received prior carboplatin-based regimens, and an additional 8% received both cisplatin and carboplatin-based regimens.
The major efficacy outcome measures were confirmed objective response rate (ORR) and duration of response (DOR) assessed by blinded independent central review (BICR) using RECIST v1.1.
Efficacy results are presented in Table 6.
Table 6: Efficacy Results in EV201 (BICR Assessment)
| Endpoint | PADCEV n=125* |
| Confirmed ORR | 44% |
| (95% CI) | (35.1, 53.2) |
| Complete Response Rate (CR) | 12% |
| Partial Response Rate (PR) | 32% |
| Median† Duration of Response, months | 7.6‡ |
| (95% CI) | (6.3, NE) |
| NE = not estimable *Median follow-up duration of 10.2 months †Kaplan-Meier estimate. ‡Based on patients (n=55) with a response by BICR. | |
PADCEV
(PAD-sev)
(enfortumab vedotin-ejfv) for injection
What is PADCEV™?
PADCEV is a prescription medicine used to treat adults with bladder cancer and cancers of the urinary tract (renal pelvis, ureter or urethra) that has spread or cannot be removed by surgery. PADCEV may be used if you have:
It is not known if PADCEV is safe and effective in children.
Before receiving PADCEV, tell your healthcare provider about all of your medical conditions, including if you:
Females who are able to become pregnant:
Males with a female sexual partner who is able to become pregnant:
Tell your healthcare provider about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements.
How will I receive PADCEV?
What are the possible side effects of PADCEV?
PADCEV may cause serious side effects, including:
Leakage of PADCEV out of your vein into the tissues around your infusion site (extravasation). If PADCEV leaks from the injection site or the vein into the nearby skin and tissues, it could cause an infusion site reaction. These reactions can happen right after you receive an infusion, but sometimes may happen days after your infusion. Tell your healthcare provider or get medical help right away if you notice any redness, swelling, itching, or discomfort at the infusion site.
The most common side effects of PADCEV include:
If you have certain side effects, your healthcare provider may decrease your dose or stop your treatment with PADCEV for a period of time (temporarily) or completely.
PADCEV may cause fertility problems in males, which may affect the ability to father children. Talk to your healthcare provider if you have concerns about fertility.
These are not all of the possible side effects of PADCEV.
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
General information about the safe and effective use of PADCEV.
Medicines are sometimes prescribed for purposes other than those listed in a Patient Information leaflet. If you would like more information about PADCEV, talk with your healthcare provider. You can ask your pharmacist or healthcare provider for information about PADCEV that is written for healthcare professionals.
What are the ingredients in PADCEV?
Active ingredient: enfortumab vedotin
Inactive ingredients: histidine, histidine hydrochloride monohydrate, polysorbate 20, and trehalose dehydrate.
This Patient Information has been approved by the U.S. Food and Drug Administration.
