Most patients cannot be included in randomized clinical trials. We report real-world outcomes of all Danish patients with multiple myeloma (MM) treated with daratumumab-based regimens until 1 January 2019. Methods Information of 635 patients treated with daratumumab was collected retrospectively and included lines of therapy (LOT), hematologic responses according to the International Myeloma Working Group recommendations, time to next treatment (TNT) and the cause of discontinuation of treatment. Baseline characteristics were acquired from the validated Danish Multiple Myeloma Registry (DMMR). Results Daratumumab was administrated as monotherapy (Da-mono) in 27.7%, in combination with immunomodulatory drugs (Da-IMiD) in 57.3%, in combination with proteasome inhibitors (Da-PI) in 11.2% and in other combinations (Da-other) in 3.8% of patients. The median number of lines of therapy given before daratumumab was 5 for Da-mono, 3 for Da-IMiD, 4 for Da-PI, and 2 for Da-other. In Da-mono, overall response rate (ORR) was 44.9% and median time to next treatment (mTNT) was 4.9 months. In Da-IMiD, ORR was 80.5%, and mTNT was 16.1 months. In Da-PI, OOR was 60.6% and mTNT was 5.3 months. In patients treated with Da-other, OOR was 54,2% and mTNT was 5.6 months. The use of daratumumab in early LOT was associated with longer TNT (p<0.0001). Patients with amplification 1q had outcome comparable to standard risk patients, while patients with t(4;14), t(14;16) or del17p had worse outcome (p = 0.0001). Multivariate analysis indicated that timing of treatment (timing of daratumumab in the sequence of all LOT that the patients received throughout the course of their disease) was the most important factor for outcome (p<0.0001). Conclusion The real-world outcomes of multiple myeloma patients treated with daratumumab are worse than the results of clinical trials. Outcomes achieved with daratumumab were best when daratumumab was used in combination with IMIDs and in early LOT. Patients with high-risk CA had worse outcomes, but patients with amp1q had similar outcomes to standard-risk patients.

The persistence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibodies is a matter of importance regarding the coronavirus disease 19 pandemic. To observe antibody dynamics, 105 blood donors, positive for SARS-CoV-2 antibodies by a lateral flow test within a seroprevalence study, were included in this study. Thirty-nine (37%) of 105 the donors were confirmed positive by a total Ig Wantai enzyme-linked immunosorbent assay (ELISA). Three (8%) in this group of 39 reported severe and 26/39 (67%) mild to moderate COVID-19 symptoms. By further ELISA-testing, 33/39 (85%) donors were initially positive for IgG antibodies, 31/39 (79%) for IgA, and 32/39 (82%) for IgM, while 27/39 (69%) were positive for all three isotypes. Persistence of IgG, IgA, and IgM was observed in 73%, 79%, and 32% of donors, respectively, after 6-9 months of observation. For IgM antibodies, the decline in the proportion of positive donors was statistically significant (p = 0.002) during 12 months observation, for IgG only the decline at 3 months was statistically significant (p = 0.042). Four donors exhibited notable increases in antibody levels. In conclusion, persistent SARS-CoV-2 IgA antibodies and IgG antibodies at 6-9 months are present in approximately three of four individuals with previous mild to moderate

Real world evidence is important since most patients cannot be included in randomized clinical trials (RCTs). In a nationwide, cohort of relapsed/refractory multiple myeloma patients treated with daratumumab (N = 635), we retrospective studied patients treated with carfilzomib (N = 251). Data were collected by audit of medical records. We compared characteristics of patients treated with carfilzomib before daratumumab (Car-Da; N = 150) and after daratumumab (Da-Car; N = 101) with those not treated with carfilzomib (N = 384). Furthermore, we examined effectiveness and safety of carfilzomib. The group of patients treated with carfilzomib differed from patients not treated with carfilzomib in the following parameters: They were younger, more were treated up-front with high dose melphalan and

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Daratumumab is an integral part of the treatment of multiple myeloma (MM) but its real-world efficacy has only been described in small cohorts. MAMMOTH is the only large multi-center study that reported the outcomes of CD38-refractory MM. The present study includes a complete, Danish, nation-wide cohort of 635 MM patients who initiated treatment a daratumumab-containing index regimen (IR) prior to 1.1.2019, and describes the outcomes of 472 patients who discontinued their IR until 1.1.2021. Patients received a median of 3 lines of therapy (LOT) prior to the IR. The median time from diagnosis to discontinuation of the IR (T 0) was 4 years. At T 0, 73% of patients were quadruple drug class exposed (CE). The median overall survival (mOS) after T 0 was 12.2 months in the entire cohort, 15.3 months in double CE, 22.5 months in triple CE, 12.6 months in quadruple CE and 8.3 months in alkylator-bortezomib-carfilzomib-daratumumab-lenalidomide-pomalidomide-exposed patients. After T 0, 79%, 48%, 29%, 17%, 10% and 6% of patients received 1, 2, 3, 4, 5, 6 additional LOT, respectively, achieving overall response rates ranging from 44% to 11% and median time to next treatment (TNT) from 138 to 54 days. In the first subsequent LOT after T 0, 51% of patients were retreated with daratumumab. Despite the lack of benefit in terms response and TNT, daratumumab retreatment was associated with superior OS on multivariate analysis adjusting for age, previous transplantation, IR, drug class exposure at T 0, treating site, time from diagnosis to T 0 and presence of cytogenetic high-risk markers. Median OS was 24.6 months in patients retreated with and 11.3 months in patients treated without daratumumab (p&lt;0.0001). In conclusion, patients with MM who discontinue their first daratumumab-containing regimen have a life expectancy of approximately one year. Our results support a rationale behind daratumumab retreatment. Legends to Figure: A: Overall survival after T 0; B: Overall survival after T 0 by cytogenetic risk; C: Overall survival after T 0 by IR; D: Overall survival after T 0 by prior exposure. Abbreviations: T 0=time of discontinuation of the first daratumumab-containing line of therapy; IR=index regimen; high-risk=t(4;14), t(14;16) or del17p by FISH; D-mono=daratumumab monotherapy; D-bor=daratumumab-bortezomib-dexamethasone; D-len=daratumumab-lenalidomide-dexamethasone; D-other=daratumumab in other combinations; Double_CE=exposed to daratumumab and another class of drugs; Triple_CE=exposed to daratumumab and two other classes of drugs; Quadruple_CE=exposed to daratumumab and three other classes of drugs; ABCDLP-exposed=exposed to daratumumab, bortezomib, carfilzomib, lenalidomide and pomalidomide Figure 1 Figure 1. Disclosures Szabo: Takeda: Consultancy; Sanofi: Consultancy; Janssen: Consultancy.