On June 1, 2024 Pfizer Inc. (NYSE: PFE) reported detailed overall survival (OS) results from the Phase 3 ECHELON-3 study of ADCETRIS (brentuximab vedotin) in combination with lenalidomide and rituximab for the treatment of patients with relapsed/refractory diffuse large B-cell lymphoma (DLBCL) (Press release, Seagen, JUN 1, 2024, View Source [SID1234643931]). The study showed that the ADCETRIS combination reduced patients’ risk of death by 37% compared to placebo in combination with lenalidomide and rituximab (HR 0.63 [95% CI: 0.445-0.891] p=0.0085). The overall survival benefit was consistent across levels of CD30 expression.
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The ECHELON-3 results will be presented as a late-breaker (LBA7005) in an oral session at the 2024 American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Annual Meeting along with four-year results from the Phase 3 HD21 trial in advanced classical Hodgkin lymphoma (cHL) (LBA7000).
"ECHELON-3 is one of the first randomized, placebo-controlled Phase 3 studies to demonstrate an overall survival benefit in patients with relapsed/refractory DLBCL after two or more prior lines of systemic therapy," said principal investigator Dr. Jeung-A Kim, College of Medicine, The Catholic University of Korea. "The clinically meaningful improvement in survival demonstrates the potential benefit of this ADCETRIS regimen in relapsed/refractory DLBCL, particularly for patients whose disease has progressed after CAR-T therapy or bispecific antibody treatment or individuals who are not able to receive these treatments."
ADCETRIS is approved in the U.S. as monotherapy or in combination with chemotherapy for seven lymphomas including certain types of cHL, anaplastic large cell lymphoma and peripheral T-cell lymphoma. Seven-year survival data for an ADCETRIS regimen for patients with advanced stage cHL will be shared in a poster presentation (7053) at the ASCO (Free ASCO Whitepaper) Meeting on June 3.
"Three Phase 3 trials in three different types of lymphoma have now demonstrated that an ADCETRIS-containing regimen improved overall survival," said Roger Dansey, M.D., Chief Development Officer, Oncology, Pfizer. "ADCETRIS is a standard of care medicine in its approved indications today, and these impressive results from an interim analysis highlight its potential to benefit people with relapsed/refractory DLBCL regardless of CD30 expression."
DLBCL is the most common lymphoma and is aggressive and difficult to treat, with up to 40 percent of patients experiencing disease progression after initial therapy.1,2
Among 230 randomized patients in the trial, the interim analysis showed that median OS in patients randomized to receive ADCETRIS, lenalidomide and rituximab was 13.8 months (95% CI: 10.3-18.8) compared to 8.5 months (95% CI: 5.4-11.7) in patients randomized to lenalidomide and rituximab plus placebo.
Median progression-free survival (PFS) was 4.2 months (95% CI: 2.9-7.1) in the ADCETRIS arm versus 2.6 months (95% CI: 1.4-3.1) in the lenalidomide and rituximab plus placebo arm (HR 0.527 [95% CI: 0.380-0.729] p<0.0001). The overall response rate for patients treated with the ADCETRIS regimen was 64.3% (95% CI: 54.7-73.1) versus 41.5% (95% CI: 32.5-51.0) in the lenalidomide and rituximab plus placebo arm. The complete response rate was 40.2% in ADCETRIS-treated patients (95% CI: 31.0%, 49.9%) compared to 18.6% (95% CI:12.1%, 26.9%) in the lenalidomide and rituximab plus placebo arm.
The most frequently reported treatment-emergent adverse events (TEAEs) Grade 3 or higher for the ADCETRIS versus placebo arms were: neutropenia (43% vs 28%), thrombocytopenia (25% vs 19%) and anemia (22% vs 21%). Peripheral sensory neuropathy was infrequent and low grade for each arm with Grade 3 events of 4% vs 0%.
About ECHELON-3
ECHELON-3 is an ongoing, randomized, double-blind, multicenter Phase 3 study evaluating ADCETRIS plus lenalidomide and rituximab versus lenalidomide and rituximab plus placebo in adult patients with relapsed/refractory DLBCL, regardless of CD30 expression, who have received two or more prior lines of therapy and are ineligible for stem cell transplant or CAR-T therapy. In this global study, 230 patients were randomized across North America, Europe and Asia-Pacific. The primary endpoint is OS in the intent to treat population, with key secondary endpoints of PFS and ORR as assessed by investigator. Other secondary endpoints include complete response rate, duration of response, safety and tolerability.
About Diffuse Large B-cell Lymphoma
DLBCL is the most frequent type of lymphoma and is aggressive and difficult to treat.1,2 More than 25,000 cases of DLBCL are diagnosed each year in the United States, accounting for more than 25 percent of all lymphoma cases.2 DLBCL can develop spontaneously or as a result of diseases such as chronic lymphocytic lymphoma/small lymphocytic lymphoma, follicular lymphoma, or marginal zone lymphoma.1 Up to 40 percent of patients relapse or have refractory disease after frontline treatment.2
About ADCETRIS
More than 55,000 patients have been treated with ADCETRIS in the U.S. since its first U.S. approval in 2011, and more than 140,000 patients have been treated with ADCETRIS globally.
ADCETRIS is an antibody-drug conjugate (ADC) comprised of a CD30-directed monoclonal antibody attached by a protease-cleavable linker to a microtubule disrupting agent, monomethyl auristatin E (MMAE), utilizing Pfizer’s proprietary technology. The ADC employs a linker system that is designed to be stable in the bloodstream but to release MMAE upon internalization into CD30-positive tumor cells.
ADCETRIS is approved in seven indications in the U.S.:
Adult patients with previously untreated Stage III/IV classical Hodgkin lymphoma (cHL) in combination with doxorubicin, vinblastine, and dacarbazine (2018)
Pediatric patients 2 years and older with previously untreated high risk cHL in combination with doxorubicin, vincristine, etoposide, prednisone and cyclophosphamide (2022)
Adult patients with cHL at high risk of relapse or progression as post-autologous hematopoietic stem cell transplantation (auto-HSCT) consolidation (2015)
Adult patients with cHL after failure of auto-HSCT or after failure of at least two prior multi-agent chemotherapy regimens in patients who are not auto-HSCT candidates (2011)
Adult patients with previously untreated systemic anaplastic large cell lymphoma (sALCL) or other CD30-expressing peripheral T-cell lymphomas (PTCL), including angioimmunoblastic T-cell lymphoma and PTCL not otherwise specified, in combination with cyclophosphamide, doxorubicin, and prednisone (2018)
Adult patients with sALCL after failure of at least one prior multi-agent chemotherapy regimen. (2011)
Adult patients with primary cutaneous anaplastic large cell lymphoma (pcALCL) or CD30-expressing mycosis fungoides (MF) after prior systemic therapy (2017)
Pfizer and Takeda jointly develop ADCETRIS. Under the terms of the collaboration agreement, Pfizer has U.S. and Canadian commercialization rights, and Takeda has rights to commercialize ADCETRIS in the rest of the world. Pfizer and Takeda are funding joint development costs for ADCETRIS on a 50:50 basis, except in Japan where Takeda is solely responsible for development costs.
ADCETRIS (brentuximab vedotin) for injection U.S. Important Safety Information
BOXED WARNING
PROGRESSIVE MULTIFOCAL LEUKOENCEPHALOPATHY (PML): JC virus infection resulting in PML, and death can occur in ADCETRIS-treated patients.
CONTRAINDICATION
Contraindicated with concomitant bleomycin due to pulmonary toxicity (e.g., interstitial infiltration and/or inflammation).
WARNINGS AND PRECAUTIONS
Peripheral neuropathy (PN): ADCETRIS causes PN that is predominantly sensory. Cases of motor PN have also been reported. ADCETRIS-induced PN is cumulative. Monitor for symptoms such as hypoesthesia, hyperesthesia, paresthesia, discomfort, a burning sensation, neuropathic pain, or weakness. Patients experiencing new or worsening PN may require a delay, change in dose, or discontinuation of ADCETRIS.
Anaphylaxis and infusion reactions: Infusion-related reactions (IRR), including anaphylaxis, have occurred with ADCETRIS. Monitor patients during infusion. If an IRR occurs, interrupt the infusion and institute appropriate medical management. If anaphylaxis occurs, immediately and permanently discontinue the infusion and administer appropriate medical therapy. Premedicate patients with a prior IRR before subsequent infusions. Premedication may include acetaminophen, an antihistamine, and a corticosteroid.
Hematologic toxicities: Fatal and serious cases of febrile neutropenia have been reported with ADCETRIS. Prolonged (≥1 week) severe neutropenia and Grade 3 or 4 thrombocytopenia or anemia can occur with ADCETRIS.
Administer G-CSF primary prophylaxis beginning with Cycle 1 for adult patients who receive ADCETRIS in combination with chemotherapy for previously untreated Stage III/IV cHL or previously untreated PTCL, and pediatric patients who receive ADCETRIS in combination with chemotherapy for previously untreated high risk cHL.
Monitor complete blood counts prior to each ADCETRIS dose. Monitor more frequently for patients with Grade 3 or 4 neutropenia. Monitor patients for fever. If Grade 3 or 4 neutropenia develops, consider dose delays, reductions, discontinuation, or G-CSF prophylaxis with subsequent doses.
Serious infections and opportunistic infections: Infections such as pneumonia, bacteremia, and sepsis or septic shock (including fatal outcomes) have been reported in ADCETRIS-treated patients. Closely monitor patients during treatment for infections.
Tumor lysis syndrome: Patients with rapidly proliferating tumor and high tumor burden may be at increased risk. Monitor closely and take appropriate measures.
Increased toxicity in the presence of severe renal impairment: The frequency of ≥Grade 3 adverse reactions and deaths was greater in patients with severe renal impairment. Avoid use in patients with severe renal impairment.
Increased toxicity in the presence of moderate or severe hepatic impairment: The frequency of ≥Grade 3 adverse reactions and deaths was greater in patients with moderate or severe hepatic impairment. Avoid use in patients with moderate or severe hepatic impairment.
Hepatotoxicity: Fatal and serious cases have occurred in ADCETRIS-treated patients. Cases were consistent with hepatocellular injury, including elevations of transaminases and/or bilirubin, and occurred after the first ADCETRIS dose or rechallenge. Preexisting liver disease, elevated baseline liver enzymes, and concomitant medications may increase the risk. Monitor liver enzymes and bilirubin. Patients with new, worsening, or recurrent hepatotoxicity may require a delay, change in dose, or discontinuation of ADCETRIS.
PML: Fatal cases of JC virus infection resulting in PML have been reported in ADCETRIS-treated patients. First onset of symptoms occurred at various times from initiation of ADCETRIS, with some cases occurring within 3 months of initial exposure. In addition to ADCETRIS therapy, other possible contributory factors include prior therapies and underlying disease that may cause immunosuppression. Consider PML diagnosis in patients with new-onset signs and symptoms of central nervous system abnormalities. Hold ADCETRIS if PML is suspected and discontinue ADCETRIS if PML is confirmed.
Pulmonary toxicity: Fatal and serious events of noninfectious pulmonary toxicity, including pneumonitis, interstitial lung disease, and acute respiratory distress syndrome, have been reported. Monitor patients for signs and symptoms, including cough and dyspnea. In the event of new or worsening pulmonary symptoms, hold ADCETRIS dosing during evaluation and until symptomatic improvement.
Serious dermatologic reactions: Fatal and serious cases of Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) have been reported with ADCETRIS. If SJS or TEN occurs, discontinue ADCETRIS and administer appropriate medical therapy.
Gastrointestinal (GI) complications: Fatal and serious cases of acute pancreatitis have been reported. Other fatal and serious GI complications include perforation, hemorrhage, erosion, ulcer, intestinal obstruction, enterocolitis, neutropenic colitis, and ileus. Lymphoma with pre-existing GI involvement may increase the risk of perforation. In the event of new or worsening GI symptoms, including severe abdominal pain, perform a prompt diagnostic evaluation and treat appropriately.
Hyperglycemia: Serious cases, such as new-onset hyperglycemia, exacerbation of pre-existing diabetes mellitus, and ketoacidosis (including fatal outcomes) have been reported with ADCETRIS. Hyperglycemia occurred more frequently in patients with high body mass index or diabetes. Monitor serum glucose and if hyperglycemia develops, administer anti-hyperglycemic medications as clinically indicated.
Embryo-fetal toxicity: Based on the mechanism of action and animal studies, ADCETRIS can cause fetal harm. Advise females of reproductive potential of this potential risk, and to use effective contraception during ADCETRIS treatment and for 2 months after the last dose of ADCETRIS. Advise male patients with female partners of reproductive potential to use effective contraception during ADCETRIS treatment and for 4 months after the last dose of ADCETRIS.
ADVERSE REACTIONS
The most common adverse reactions (≥20% in any study) are peripheral neuropathy, fatigue, nausea, diarrhea, neutropenia, upper respiratory tract infection, pyrexia, constipation, vomiting, alopecia, decreased weight, abdominal pain, anemia, stomatitis, lymphopenia, mucositis, thrombocytopenia, and febrile neutropenia.
DRUG INTERACTIONS
Concomitant use of strong CYP3A4 inhibitors has the potential to affect the exposure to monomethyl auristatin E (MMAE). Closely monitor adverse reactions.
USE IN SPECIAL POPULATIONS
L actation: Breastfeeding is not recommended during ADCETRIS treatment.
Please see the full Prescribing Information, including BOXED WARNING, for ADCETRIS here.