Seagen Announces Preliminary Results from Phase 2 Clinical Trial of ADCETRIS ® (brentuximab vedotin) in Novel Combination of Agents for Patients with Advanced Stage Classical Hodgkin Lymphoma
Seagen Inc. (Nasdaq:SGEN) today announced promising efficacy and safety results from Part B of an open-label, phase 2 clinical trial evaluating ADCETRIS® (brentuximab vedotin) in a novel combination with nivolumab, doxorubicin, and dacarbazine (AN+AD) as a frontline treatment for patients with advanced stage classical Hodgkin lymphoma (cHL). Data from this preliminary analysis were presented (Abstract #2454) as part of a poster presentation at the 63rd American Society of Hematology (ASH) Annual Meeting and Exposition in Atlanta.
The preliminary results demonstrated a complete response rate of 88 percent (95% CI: 75.9, 94.8) and overall response rate of 93 percent (95% CI: 82.7, 98.0) among 56 patients who had an end of treatment assessment on or prior to the data cutoff date. Patients received up to six cycles of treatment and were evaluated after two cycles of therapy and at the end of treatment. AN+AD was well-tolerated and no new safety signals were observed.
“I am excited about this combination of brentuximab vedotin and nivolumab along with a simplified chemotherapy regimen for the frontline treatment of patients with advanced stage classical Hodgkin lymphoma,” said Hun Ju Lee, M.D., Associate Professor of Medicine, Department of Lymphoma and Myeloma, MD Anderson Cancer Center, Houston. “This combination demonstrated a low incidence of peripheral neuropathy and the absence of febrile neutropenia. What we are learning from our research is that the use of two active targeted agents with distinct and complementary mechanisms of action in the first-line setting shows promising activity and a tolerable safety profile.”
“We are optimistic about novel combination approaches to improve outcomes in patients following a diagnosis of classical Hodgkin lymphoma, and we are encouraged by these data evaluating ADCETRIS plus nivolumab, doxorubicin and dacarbazine as a first-line therapy,” said Roger Dansey, M.D., Chief Medical Officer at Seagen. “We look forward to complete results from this trial and adding to the breadth of evidence for ADCETRIS in the treatment of advanced classical Hodgkin lymphoma.”
- Among 56 patients who had an end of treatment assessment on or prior to the data cutoff date, there was a complete response rate of 88 percent (95% CI: 75.9, 94.8) and overall response rate of 93 percent (95% CI: 82.7, 98.0).
- The most frequently reported treatment-related treatment-emergent adverse events (AEs) occurring in more than 20 percent of patients who received AN+AD included nausea (65%), fatigue (46%), peripheral sensory neuropathy (39%), alopecia (35%), diarrhea (30%) and constipation (25%).
- Immune-mediated AEs were observed in 18 patients (32%) and eight patients (14%) experienced treatment-related treatment-emergent serious AEs.
- Two patients (4%) experienced Grade > 3 peripheral neuropathy and no patients discontinued treatment due to peripheral neuropathy. No febrile neutropenia was observed, and there were no Grade 5 adverse events.
See ADCETRIS U.S. Important Safety Information, including Boxed Warning, below.
About the SGN35-027 Clinical Study
SGN35-027 is an ongoing open-label, multiple part, multicenter, phase 2 clinical trial evaluating two brentuximab vedotin treatment combinations in patients with advanced stage classical Hodgkin lymphoma. The trial includes three parts (Parts A, B, and C). Part A includes a combination of brentuximab vedotin and doxorubicin, vinblastine and dacarbazine (A+AVD), while Parts B and C include brentuximab vedotin in combination with nivolumab, doxorubicin, and dacarbazine (AN+AD). The primary endpoint for Part A is the proportion of patients with treatment-emergent incidence of rate of febrile neutropenia. The primary endpoint for Parts B and C is the proportion of participants with complete response at end of treatment, according to the Lymphoma Response to Immunomodulatory Therapy Criteria (LYRIC). Key secondary endpoints include safety, tolerability, ORR, and PFS. Incidence of adverse events is a secondary endpoint for Parts B and C.
About Classical Hodgkin Lymphoma
Classical Hodgkin lymphoma (cHL), Hodgkin disease, or Hodgkin, is a cancer of the blood. It starts when lymphocytes, a type of white blood cell, grow out of control. People with cHL have abnormal white blood cells called Reed-Sternberg cells in their lymph nodes. These cells usually have a special protein on their surface called CD30, which is a key marker of cHL. CD30 is present in approximately 95 percent of all cases of Hodgkin lymphoma. In 2021, it is estimated that there will be 8,830 new cases of Hodgkin lymphoma and an estimated 960 people will die of this disease in the U.S.1
ADCETRIS is an antibody-drug conjugate (ADC) comprising an anti-CD30 monoclonal antibody attached by a protease-cleavable linker to a microtubule disrupting agent, monomethyl auristatin E (MMAE), utilizing Seagen’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-expressing cells.
ADCETRIS is indicated for the treatment of adult patients with:
- previously untreated Stage III or IV classical Hodgkin lymphoma (cHL), in combination with doxorubicin, vinblastine, and dacarbazine,
- cHL at high risk of relapse or progression as post-autologous hematopoietic stem cell transplantation (auto-HSCT) consolidation,
- cHL after failure of auto-HSCT or failure of at least two prior multi-agent chemotherapy regimens in patients who are not auto-HSCT candidates,
- 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,
- sALCL after failure of at least one prior multi-agent chemotherapy regimen, and
- primary cutaneous anaplastic large cell lymphoma (pcALCL) or CD30-expressing mycosis fungoides who have received prior systemic therapy.
ADCETRIS has received marketing authorization in more than 70 countries for certain types of relapsed or refractory Hodgkin lymphoma and sALCL.
Seagen and Takeda are jointly developing ADCETRIS. Under the terms of the collaboration agreement, Seagen has U.S. and Canadian commercialization rights and Takeda has rights to commercialize ADCETRIS in the rest of the world. Seagen 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
PROGRESSIVE MULTIFOCAL LEUKOENCEPHALOPATHY (PML): JC virus infection resulting in PML and death can occur in ADCETRIS-treated patients.
ADCETRIS concomitant with 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. Institute dose modifications accordingly.
- 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 patients who receive ADCETRIS in combination with chemotherapy for previously untreated Stage III/IV cHL or previously untreated PTCL.
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 bacterial, fungal, or viral infections.
- Tumor lysis syndrome: Closely monitor patients with rapidly proliferating tumor and high tumor burden.
- 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 compared to patients with normal renal function. 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 compared to patients with normal hepatic function. 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 preexisting 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 the potential risk to the fetus, and to avoid pregnancy during ADCETRIS treatment and for at least 6 months after the final dose of ADCETRIS.
Most Common (≥20% in any study) Adverse Reactions
Peripheral neuropathy, fatigue, nausea, diarrhea, neutropenia, upper respiratory tract infection, pyrexia, constipation, vomiting, alopecia, decreased weight, abdominal pain, anemia, stomatitis, lymphopenia, and mucositis.
Concomitant use of strong CYP3A4 inhibitors or inducers has the potential to affect the exposure to monomethyl auristatin E (MMAE).
Use in Specific Populations
Moderate or severe hepatic impairment or severe renal impairment: MMAE exposure and adverse reactions are increased. Avoid use.
Advise males with female sexual partners of reproductive potential to use effective contraception during ADCETRIS treatment and for at least 6 months after the final dose of ADCETRIS.
Advise patients to report pregnancy immediately and avoid breastfeeding while receiving ADCETRIS.
Please see the full Prescribing Information, including BOXED WARNING, for ADCETRIS here.
Seagen is a global biotechnology company that discovers, develops and commercializes transformative cancer medicines to make a meaningful difference in people’s lives. Seagen is headquartered in the Seattle, Washington area, and has locations in California, Canada, Switzerland and the European Union. For more information on the company’s marketed products and robust pipeline, visit www.seagen.com and follow @SeagenGlobal on Twitter.
Forward Looking Statements
Certain statements made in this press release are forward looking, such as those, among others, relating to the therapeutic potential of Seagen’s products and product candidates, the company’s pipeline and the advancement of its research and development activities. Actual results or developments may differ materially from those projected or implied in these forward-looking statements. Factors that may cause such a difference include without limitation the risk of adverse events or safety signals, the inability to show sufficient activity in clinical trials, the possibility of adverse regulatory actions, and the potential for delays or setbacks in product development and the regulatory review process. More information about the risks and uncertainties faced by the company is contained under the caption “Risk Factors” included in Seagen’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2021, filed with the Securities and Exchange Commission. Seagen disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise except as required by applicable law.
1 National Cancer Institute. Surveillance, Epidemiology, and End Results (SEER) Program (2021) Hodgkin lymphoma Cancer Stats. https://seer.cancer.gov/statfacts/html/hodg.html
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