Subcutaneous Talquetamab in Elderly Patients With Multiple Myeloma in Early Relapse

Eligibility Criteria

• * Documented multiple myeloma as defined by the criteria below:
• * Multiple myeloma diagnosis according to the IMWG diagnostic criteria
• * Measurable disease at screening as assessed by central laboratory, defined by at least 1 of the following:
• * Serum M-protein level ≥0.5 g/dL (central laboratory)
• * Urine M-protein level ≥200 mg/24 hours (central laboratory)
• * Light chain multiple myeloma without measurable M-protein in the serum or the urine: serum immunoglobulin free light chain ≥10 mg/dL or \>100 mg/L (central laboratory) provided the serum free light chain ratio is abnormal (0.22 to 1.52 \[central laboratory\])
• * Relapsed disease is defined as an initial response to prior treatment, followed by confirmed progressive disease by IMWG criteria \>60 days after cessation of treatment.
• * Refractory disease is defined as \<25% reduction in M-protein or confirmed progressive disease by IMWG criteria during previous treatment or ≤60 days after cessation of treatment. Received at least 1 prior line(s) of antimyeloma therapy including a minimum of 2 consecutive cycles
• * Subject must have received at least ≥2 prior line(s) of systemic antimyeloma therapy of treating physician's discretion, including a PI and an IMID
• * Subjects who are anti-CD38 monoclonal antibody-naïve, exposed, or refractory will be allowed in Part 1; Only subjects who are anti-CD38 antibody-naïve or exposed will be allowed in Part 2, whereas subjects refractory to anti-CD38 monoclonal antibody will not be allowed in Part 2
• * Have clinical laboratory values meeting the following criteria during the Screening Phase: Hematology Hemoglobin: ≥7 g/dL (≥4.96 mmol/L; without transfusion support or erythropoietin use within 7 days before the laboratory test) Platelets: ≥50×109/L (without transfusion support or thrombopoietin receptor agonist within 7 days before the laboratory test) Absolute neutrophil count: ≥1.0×109/L (prior growth factor support is permitted but must be without support for 7 days for G-CSF or GM-CSF and for 14 days for pegylated GCSF before the laboratory test) Chemistry AST and ALT: ≤2.5×ULN eGFR: ≥30 mL/min based on Modified Diet in Renal Disease Formula calculation Total bilirubin: ≤2.0×ULN; except in participants with congenital bilirubinemia, such as Gilbert syndrome (in which case direct bilirubin ≤1.5×ULN is required) Serum calcium corrected for albumin: ≤14 mg/dL (≤3.5 mmol/L) or free ionized calcium ≤6.5 mg/dL (≤1.6 mmol/L;)
• * Human immunodeficiency virus-positive participants are eligible if they meet all of the following:
• * No detectable viral load (ie, \<50 copies/mL) at screening
• * CD4+ count \>300 cells/mm3 at screening
• * No acquired immunodeficiency syndrome (AIDS)-defining opportunistic infection within 6 months of screening
• * Receiving HAART. Any changes in HAART due to resistance/progression should occur at least 3 months prior to screening. A change in HAART due to toxicity is allowed up to 4 weeks prior to screening.
• * A male participant must agree not to donate sperm for the purpose of reproduction during the study and for a minimum of 100 days after receiving the last dose of study treatment.
• * Must be willing and able to adhere to the prohibitions and restrictions specified in this protocol (Section 2, including to not donate blood or blood components during the study and for 100 days after the last dose of study drug)
• * Sign an informed consent form (ICF) indicating that he or she understands the purpose of and procedures required for the study, and is willing to and able to participate in the study. Consent is to be obtained prior to the initiation of any study-related tests or procedures that are not part of standard-of-care for the subject's disease.
• * Contraindications or life-threatening allergies, hypersensitivity, or intolerance to any study drug or its excipients (refer to the talquetamab and daratumumab Investigator's Brochure and appropriate prescribing information).
• * Prior treatment with T-cell-engaging antibodies
• * Prior antitumor therapy as follows, prior to the first dose of study drug:
• * Gene-modified adoptive cell therapy (eg, chimeric antigen receptor modified T cells, NK cells) within 3 months
• * Targeted therapy, epigenetic therapy, or treatment with an investigational drug or an invasive investigational medical device within 21 days or at least 5 half-lives, whichever is less.
• * Investigational vaccine other than SARS CoV-2 vaccine approved/ in use under emergency approval within 4 weeks o Live, attenuated vaccine within 4 weeks
• * Monoclonal antibody treatment for multiple myeloma within 21 days.
• * Cytotoxic therapy within 21 days.
• * Proteasome inhibitor therapy within 14 days. o Immunomodulatory agent therapy within 14 days. o Radiotherapy within 14 days or focal radiation within 7 days
• * Toxicities from previous anticancer therapies should have resolved to baseline levels or to Grade 1 or less except for alopecia or peripheral neuropathy.
• * Received a maximum cumulative dose of corticosteroids equivalent to ≥140 mg of prednisone within the 14-day period before the first dose of study drug.
• * Stem cell transplantation:
• * Previous allogenic stem cell transplant
• * Received an autologous stem cell transplant ≤12 weeks before the first dose of study drug
• * Known active CNS involvement or exhibits clinical signs of meningeal involvement of multiple myeloma. If either is suspected, negative whole brain MRI and lumbar cytology are required.
• * Plasma cell leukemia (\>20% circulating plasma cells and/or \>2.0 x 109/L plasma cells by standard differential), Waldenström's macroglobulinemia, POEMS syndrome (polyneuropathy, organomegaly, endocrinopathy, monoclonal protein \[M-protein\], and skin changes), or primary amyloid light chain amyloidosis.
• * Myelodysplastic syndrome or active malignancies (ie, progressing or requiring treatment change in the last 24 months) other than relapsed/refractory multiple myeloma. The only allowed exceptions are:
• * Noninvasive cervical cancer treated within the last 24 months that is considered completely cured
• * Localized prostate cancer (N0M0):
• * With a Gleason score of 3+4 that has been treated \>6 months prior to full study screening and considered to have a very low risk of recurrence, or
• * History of localized prostate cancer and receiving androgen deprivation therapy and considered to have a very low risk of recurrence
• * Breast cancer: adequately treated lobular carcinoma in situ or ductal carcinoma in situ, or history of localized breast cancer and receiving antihormonal agents and considered to have a very low risk of recurrence
• * Other malignancy that is considered cured with minimal risk of recurrence.
• * Stroke or seizure within 6 months prior to signing ICF.
• * Any of the following:
• * Active Hepatitis B infection (ie, HBsAg or HBV-DNA positive). In the event the infection status is unclear, quantitative viral levels are necessary to determine the infection status see Section Hepatitis B Virus Testing 8.7.1.18.7.1 for further required assessments.
• * Active hepatitis C infection as measured by positive HCV-RNA testing. Participants with a history of HCV antibody positivity must undergo HCV-RNA testing. If a participant with history of chronic hepatitis C infection (defined as both HCV antibody and HCV-RNA positive) completed antiviral therapy and has undetectable HCV-RNA for at least 12 weeks following the completion of therapy, the participant is eligible for the study.
• * Any concurrent medical or psychiatric condition or disease that is likely to interfere with study procedures or results, or that in the opinion of the investigator would constitute a hazard for participating in this study, such as:
• * Uncontrolled diabetes o Acute diffuse infiltrative pulmonary disease
• * Evidence of active systemic viral, fungal, or bacterial infection, requiring systemic antimicrobial therapy within 7 days of start of study treatment
• * Active autoimmune disease requiring systemic immunosuppressive therapy within 6 months before start of study treatment.
• * Disabling psychiatric conditions (e.g., alcohol or drug abuse), severe dementia, or altered mental status
• * Any other issue that would impair the ability of the participant to receive or tolerate the planned treatment at the investigational site, to understand informed consent or any condition for which, in the opinion of the investigator, participation would not be in the best interest of the participant (e.g., compromise the well-being) or that could prevent, limit, or confound the protocol-specified assessments
• * History of non-compliance with recommended medical treatments • Plans to father a child while enrolled in this study or within 100 days after the last dose of study drug.
• * New York Heart Association stage III or IV congestive heart failure
• * Myocardial infarction or coronary artery bypass graft ≤6 months prior to randomization
• * Uncontrolled cardiac arrhythmia or clinically significant ECG abnormalities
• * History of clinically significant ventricular arrhythmia or unexplained syncope, not believed to be vasovagal in nature or due to dehydration o History of severe non-ischemic cardiomyopathy • Major surgery within 2 weeks prior to the start of administration of study treatment, or will not have fully recovered from surgery, or has major surgery planned during the time the participant is expected to be treated in the study or within 2 weeks after administration of the last dose of study treatment.
• * NOTE: Participants with planned surgical procedures to be conducted under local anesthesia may participate. Kyphoplasty or vertebroplasty are not considered major surgery. If there is a question whether a procedure is considered a major surgery, the investigator must consult with the appropriate sponsor representative and resolve any issues before enrolling a participant in the study • Known chronic obstructive pulmonary disease (COPD) with a forced expiratory volume in 1 second (FEV1) \<50% of predicted normal of DLCO \<50%).