Daratumumab monotherapy for relapsed/refractory multiple myeloma, focussed on clinical trial-unfit patients and subsequent therapy

CD46 and CD59 inhibitors enhance complement-dependent cytotoxicity of anti-CD38 monoclonal antibodies daratumumab and isatuximab in multiple myeloma and other B-cell malignancy cells

Multiple myeloma (MM) is an incurable malignancy of the B-cell lineage. Remarkable progress has been made in the treatment of MM with anti-CD38 monoclonal antibodies such as daratumumab and isatuximab, which can kill MM cells by inducing complement-dependent cytotoxicity (CDC). We showed that the CDC efficacy of daratumumab and isatuximab is limited by membrane complement inhibitors, including CD46 and CD59, which are upregulated in MM cells. We recently developed a small recombinant protein, Ad35K++, which is capable of transiently removing CD46 from the cell surface. We also produced a peptide inhibitor of CD59 (rILYd4). In this study, we tested Ad35K++ and rILYd4 in combination with daratumumab and isatuximab in MM cells as well as in cells from two other B-cell malignancies. We showed that Ad35K++ and rILYd4 increased CDC triggered by daratumumab and isatuximab. The combination of both inhibitors had an additive effect in vitro in primary MM cells as well as in vivo in a mouse xenograft model of MM. Daratumumab and isatuximab treatment of MM lines (without Ad35K++ or rILYd4) resulted in the upregulation of CD46/CD59 and/or survival of CD46high/CD59high MM cells that escaped the second round of daratumumab and isatuximab treatment. The escape in the second treatment cycle was prevented by the pretreatment of cells with Ad35K++. Overall, our data demonstrate that Ad35K++ and rILYd4 are efficient co-therapeutics of daratumumab and isatuximab, specifically in multi-cycle treatment regimens, and could be used to improve treatment of multiple myeloma.

Access to Chronic Pain Services for Adults from Minority Ethnic Groups in the United Kingdom (UK): a Scoping Review

BACKGROUND

Chronic pain services in the UK are required to provide services which meet the diverse needs of patients, but little is known about the access and use of these services by minority ethnic groups.

OBJECTIVE

To assess the available evidence regarding the ethnic profile of adults who access secondary and tertiary chronic pain services in the UK.

METHODS

A scoping review was conducted (August 2021-October 2021), comprising comprehensive literature searches using Embase, Medline and CINAHL databases and the grey literature. Studies were included if they reported on (i) access to chronic pain services in secondary and/or tertiary care in the UK, (ii) adults and (iii) stated the ethnicity of the involved participants. Studies were included if published between 2004 and 2021, as demographic data during this period would be broadly representative of the UK population, as per the 2021 UK census. A descriptive synthesis of the extracted data was performed.

RESULTS

The search yielded 124 records after duplicates were removed. Following title and abstract screening, 44 full texts were screened, ten of which were included in the review.

CONCLUSIONS

This is the first review to explore access to chronic pain services for adults from minority ethnic groups in the UK. Given the limited number of studies that met the inclusion criteria, the review highlights the need for routine collection of ethnicity data using consistent ethnic categories within UK chronic pain services and increased involvement of minority ethnic groups within chronic pain research. Findings should inform future research that aims to improve access to UK chronic pain services for adults from minority ethnic groups.

A real‑world pharmacovigilance study of FDA adverse event reporting system events for daratumumab

BACKGROUND

Daratumumab, a first-in-class humanized IgG1κ monoclonal antibody that targets the CD38 epitope, has been approved for treatment of multiple myeloma by FDA. The current study was to evaluate daratumumab-related adverse events (AEs) through data mining of the US Food and Drug Administration Adverse Event Reporting System (FAERS).

RESEARCH DESIGN AND METHODS

Disproportionality analyses, including the reporting odds ratio (ROR), the proportional reporting ratio (PRR), the Bayesian confidence propagation neural network (BCPNN) and the multi-item gamma Poisson shrinker (MGPS) algorithms were employed to quantify the signals of daratumumab-associated AEs.

RESULTS

Out of 10,378,816 reports collected from the FAERS database, 8727 reports of daratumumab-associated AEs were identified. A total of 183 significant disproportionality preferred terms (PTs) were retained. Unexpected significant AEs such as meningitis aseptic, leukoencephalopathy, tumor lysis syndrome, disseminated intravascular coagulation, hyperviscosity syndrome, sudden hearing loss, ileus and diverticular perforation were also detected. The median onset time of daratumumab-related AEs was 11 days (interquartile range [IQR] 0-76 days), and most of the cases occurred within 30 days.

CONCLUSION

Our study found potential new and unexpected AEs signals for daratumumab, suggesting prospective clinical studies are needed to confirm these results and illustrate their relationship.

Efficacy and safety of melflufen plus daratumumab and dexamethasone in relapsed/refractory multiple myeloma: results from the randomized, open-label, phase III LIGHTHOUSE study

Melphalan flufenamide (melflufen), a first-in-class alkylating peptide-drug conjugate, plus dexamethasone was approved in Europe for use in patients with triple-class refractory relapsed/refractory multiple myeloma (RRMM) with ≥3 prior lines of therapy and without prior autologous stem cell transplantation (ASCT) or with a time to progression >36 months after prior ASCT. The randomized LIGHTHOUSE study (NCT04649060) assessed melflufen plus daratumumab and dexamethasone (melflufen group) versus daratumumab in patients with RRMM with disease refractory to an immunomodulatory agent and a proteasome inhibitor or who had received ≥3 prior lines of therapy including an immunomodulatory agent and a proteasome inhibitor. A partial clinical hold issued by the US Food and Drug Administration for all melflufen studies led to financial constraints and premature study closure on February 23rd 2022 (data cut-off date). In total, 54 of 240 planned patients were randomized (melflufen group, N=27; daratumumab group, N=27). Median progression-free survival (PFS) was not reached in the melflufen group versus 4.9 months in the daratumumab group (Hazard Ratio: 0.18 [95% Confidence Interval, 0.05-0.65]; P=0.0032) at a median follow-up time of 7.1 and 6.6 months, respectively. Overall response rate (ORR) was 59% in the melflufen group versus 30% in the daratumumab group (P=0.0300). The most common grade ≥3 treatment-emergent adverse events in the melflufen group versus daratumumab group were neutropenia (50% vs. 12%), thrombocytopenia (50% vs. 8%), and anemia (32% vs. 19%). Melflufen plus daratumumab and dexamethasone demonstrated superior PFS and ORR versus daratumumab in RRMM and a safety profile comparable to previously published melflufen studies.

Daratumumab in Indian patients with relapsed and refractory multiple myeloma: a prospective, multicenter, phase IV study

Aim: To assess the safety and effectiveness of daratumumab monotherapy in Indian patients with relapsed/refractory multiple myeloma. Methods: In this prospective, multicenter, phase IV study, patients (aged ≥18 years) received intravenous daratumumab (16 mg/kg) in six cycles. Safety was the primary end point. Results: Of the 139 patients included, 121 (87.1%) experienced ≥1 treatment-emergent adverse events (TEAEs; 53 [38.1%] drug-related), 32 (23%) had ≥1 serious TEAEs (five [3.6%] drug-related) and 16 (11.5%) deaths were reported (one death [0.7%] was drug-related). Overall response rate was 26.3%; 62.7% of patients had stable disease. Median time to first response and median progression-free survival were 5.2 and 5.9 months, respectively. Functional status and well-being were improved. Conclusion: Daratumumab showed an acceptable and expected safety profile with consistent efficacy, providing a novel therapeutic option for relapsed/refractory multiple myeloma management in India.

Comparisons of efficacy between frontline treatment with bortezomib-melphalan-prednisone and lenalidomide-dexamethasone for transplant-ineligible multiple myeloma: a multicenter real-world based registry report, CAREMM-2102 study

BACKGROUND

Bortezomib-melphalan-prednisone (VMP) and lenalidomide-dexamethasone (Rd) remain the standard treatments for transplant-ineligible patients with newly diagnosed multiple myeloma (NDMM). This study aimed to compare real-world benefits between the two regimens. We also were interested in exploring efficacy according to subsequent therapy following VMP or Rd.

METHODS

A total of 559 NDMM patients treated with VMP (n = 443, 79.2%) or Rd (n = 116, 20.8%) was recruited retrospectively from a multicenter database.

RESULTS

Rd provided more benefits than VMP-overall response rate: 92.2 vs. 81.8%, p = 0.018; median progression-free survival (PFS): 20.0 vs. 14.5 months, p <0.001; second PFS (PFS2): 43.9 vs. 36.9 months, p = 0.012; overall survival (OS): 100.1 vs. 85.0 months, p = 0.017. Multivariable analysis revealed significant benefits of Rd over VMP, with hazard ratios of 0.722, 0.627, and 0.586 for PFS, PFS2, and OS, respectively. In propensity score-matched cohorts with matched VMP (n = 201) and Rd (n = 67) arms to balance baseline characteristics, Rd still showed significantly better outcomes for PFS, PFS2, and OS than VMP. Following VMP failure, triplet therapy showed significant benefits for response and PFS2; after Rd failure, PFS2 with carfilzomib-dexamethasone was significantly better than bortezomib-based doublet treatment.

CONCLUSION

These real-world findings may assist with better selection between VMP and Rd as well as subsequent therapy for NDMM.

Role of daratumumab in the frontline management of multiple myeloma: a narrative review

INTRODUCTION

The prevalence of multiple myeloma (MM) has gradually increased over the last few decades in India due to growing population, better disease awareness, and improved diagnostic procedures. Despite such advances, MM remains an incurable and relapsing disease due to its heterogeneity and genomic instability. With the inclusion of monoclonal antibodies, especially daratumumab in the frontline regimen, the management landscape of MM has improved significantly resulting in better disease control and patient outcomes.

AREAS COVERED

This review aims to provide an in-depth summary of efficacy and safety of frontline daratumumab therapy in treatment of MM including patients with high-risk cytogenetic profile.

EXPERT OPINION

Based on the review of literature, daratumumab in frontline therapy has demonstrated improved efficacy in terms of reduction in disease progression or death, and superior minimal residual disease (MRD)-negativity rates with an acceptable safety profile in patients with newly diagnosed MM (NDMM) including patients with high-risk cytogenetic profile. Daratumumab alone or in combination with other drugs has shown similar clinical outcomes in patients with relapsed/refractory MM. Hence, daratumumab can be used upfront in patients with MM.

Putting the best foot forward when treating newly diagnosed multiple myeloma

Multiple myeloma (MM) remains an incurable disease. In Australia, patients receive sequential lines of novel agent (NA)-based lines of therapy (LOTs), including proteasome inhibitors, immunomodulatory drugs and CD38-targeting monoclonal antibodies within the constraints of the pharmaceutical benefits scheme. We propose that induction with a quadruplet incorporating all three drug classes and dexamethasone at diagnosis is the best approach to gain disease control.

Phase II trial of daratumumab with DCEP in relapsed/refractory multiple myeloma patients with extramedullary disease

Extramedullary multiple myeloma (EMD) is an aggressive subentity of multiple myeloma (MM) with poor prognosis. As more innovative therapeutic approaches are needed for the treatment of MM with EMD, we conducted this multicenter, non-randomized phase II trial of daratumumab in combination with dexamethasone, cyclophosphamide, etoposide and cisplatin (DARA-DCEP). A total of 32 patients (median age 59, range 35–73) were treated with DARA-DCEP. Based on the best response during the study, the complete remission (CR) rate was 35.5% and overall response rate (ORR) 67.7%. During the median follow-up of 11 months, the median progression-free survival (PFS) was 5 months and median overall survival (OS) 10 months. There were 7 long-term responders whose median PFS was not reached. The most common grade ≥ 3 hematologic AE was thrombocytopenia. The most common non-hematologic AE was nausea (22.6%), followed by dyspepsia, diarrhea and stomatitis (all 12.9%). Grade ≥ 3 daratumumab infusion-related reaction was noted in 9.7% of the patients. Except for the planned 30% dose adjustment in cycle 1, only 2 patients required DCEP dose reduction. This is one of the very few prospective trials focusing on EMD and we successfully laid grounds for implementing immunochemotherapy in MM treatment.

This is one of the very few prospective trials focusing on refractory multiple myeloma with extramdedullary disease (EMD).

We successfully laid grounds for implementing immunochemotherapy in EMD treatment.

Outcomes of daratumumab in the treatment of multiple myeloma: A retrospective cohort study from the Canadian Myeloma Research Group Database

Daratumumab (dara) has significantly altered the therapeutic landscape of multiple myeloma (MM), especially in the relapsed setting. This study aimed to evaluate the outcomes of dara-containing regimens in the Canadian real-world setting among relapsed and refractory MM available within the national Canadian Myeloma Research Group Database (CMRG-DB). A total of 583 MM patients who received dara-based therapy in second-line or later treatment were included. After a median follow-up of 17.5 months, the median progression-free survival (PFS) and overall survival (OS) for the entire cohort were 13.1 and 32.9 months, respectively. The median PFS and OS were 23.5 and 49.1 months in second-line treatment and decreased to 12.8 and 43.0 months in third-line and 7.0 and 20.5 months in fourth-line treatment respectively. Dara in monotherapy with or without corticosteroids after a median of four prior lines of therapy resulted in a median PFS of 3.9 months and a median OS of 17.1 months. The addition of bortezomib, lenalidomide or pomalidomide to dara resulted in an improved median PFS and OS of 8.3 and 26.2 months; 26.8 and 43.0 months; and 9.7 and 31.4 months respectively. These retrospective data from the CMRG-DB suggest that outcomes are superior when dara is used in combination and in earlier lines of treatment.

CART-Cell Therapy: Recent Advances and New Evidence in Multiple Myeloma

Despite the improvement in survival outcomes, multiple myeloma (MM) remains an incurable disease. Chimeric antigen receptor (CAR) T-cell therapy targeting B-cell maturation antigen (BCMA) represents a new strategy for the treatment of relapsed/refractory MM (R/R). In this paper, we describe several recent advances in the field of anti-BCMA CAR T-cell therapy and MM. Currently, available data on anti-BCMA CART-cell therapy has demonstrated efficacy and manageable toxicity in heavily pretreated R/R MM patients. Despite this, the main issues remain to be addressed. First of all, a significant proportion of patients eventually relapse. The potential strategy to prevent relapse includes sequential or combined infusion with CAR T-cells against targets other than BCMA, CAR T-cells with novel dual-targeting vector design, and BCMA expression upregulation. Another dark side of CART therapy is safety. Cytokine release syndrome (CRS) andneurologic toxicity are well-described adverse effects. In the MM trials, most CRS events tended to be grade 1 or 2, with fewer patients experiencing grade 3 or higher. Another critical point is the extended timeline of the manufacturing process. Allo-CARs offers the potential for scalable manufacturing for on-demand treatment with shorter waiting days. Another issue is undoubtedly going to be access to this therapy. Currently, only a few academic centers can perform these procedures. Recognizing these issues, the excellent response with BCMA-targeted CAR T-cell therapy makes it a treatment strategy of great promise.