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Patients receiving chimeric antigen receptor T cells (CAR-T cells) therapy may be particularly susceptible to coronavirus disease 2019 (COVID-19) because of several factors including the immunosuppression associated to the underlying disease and delayed cytopenias. Regrettably, data on outcomes of CAR-T recipients with COVID-19 are extremely scarce. The aim of this study was to investigate the characteristics and outcomes of COVID-19 in patients treated with CAR-T therapy. The European Hematology Association - Scientific Working Group Infection in Hematology endorsed a survey to collect and analyze data from patients developing COVID-19 after CAR-T therapy. Overall, 459 patients treated with CAR-T cells were reported from 18 European centers. The prevalence of COVID-19 cases was 4.8%. Median time from CAR-T therapy and COVID-19 diagnosis was 169 days. Severe infection occurred in 66.7% of patients and 43.3% of the subjects required admission to ICU. The COVID-19 mortality was 33%. In multivariable analysis, the disease status at the time of COVID-19 trended marginally towards adverse outcome (P=0.075). In conclusion, we documented a high fatality rate for CAR-T patients with COVID-19, supporting the need to design successful interventions to mitigate the risk of infection in this vulnerable group of patients.

In this paper, we present a corpus for heritage Bosnian/Croatian/Montenegrin/Serbian (BCMS) spoken in German-speaking Switzerland. The corpus consists of elicited conversations between 29 second-generation speakers originating from different regions of former Yugoslavia. In total, the corpus contains 30 turn-aligned transcripts with an average length of 6 min. It is enriched with extensive speakers’ metadata, annotations, and pre-calculated corpus counts. The corpus can be accessed through an interactive corpus platform that allows for browsing, querying, and filtering, but also for creating and sharing custom annotations. Principal user groups we address with this corpus are researchers of heritage BCMS, as well as students and teachers of BCMS living in diaspora. In addition to introducing the corpus platform and the workflows we adopted to create it, we also present a case study on BCMS spoken by a pair of siblings who participated in the map task, and discuss advantages and challenges of using this corpus platform for linguistic research.

Simple Summary Patients with simultaneous diagnosis of haematological malignancies (HM) and COVID-19 are an even greater challenge for hematologists. To better clarify their outcome, we describe the clinical features and outcome of a cohort of 450 patients with simultaneous diagnosis of HM and COVID-19 registered in the EPICOVIDEHA registry between March 2020 to February 2022. Overall, 343 (76.2%) patients received treatment for HM, and an overall response rate was observed in 140 (40.8%) patients after the first line of treatment. Thirty-day mortality was significantly higher in patients not receiving HM treatment (42.1%) than in those receiving treatment (27.4%, p = 0.004). Statistical analysis showed that, together with age, severe/critical COVID-19, >= 2 comorbidities, lack of HM treatment was an independent risk factors for mortality. These observations suggest the importance of HM treatment in these patients; therefore, it should be delivered as soon as possible for patients requiring immediate therapy. Background: The outcome of patients with simultaneous diagnosis of haematological malignancies (HM) and COVID-19 is unknown and there are no specific treatment guidelines. Methods: We describe the clinical features and outcome of a cohort of 450 patients with simultaneous diagnosis of HM and COVID-19 registered in the EPICOVIDEHA registry between March 2020 to February 2022. Results: Acute leukaemia and lymphoma were the most frequent HM (35.8% and 35.1%, respectively). Overall, 343 (76.2%) patients received treatment for HM, which was delayed for longer than one month since diagnosis in 57 (16.6%). An overall response rate was observed in 140 (40.8%) patients after the first line of treatment. After a median follow-up of 35 days, overall mortality was 177/450 (39.3%); 30-day mortality was significantly higher in patients not receiving HM treatment (42.1%) than in those receiving treatment (27.4%, p = 0.004), either before and/or after COVID-19, or compared to patients receiving HM treatment at least after COVID-19 (15.2%, p < 0.001). Age, severe/critical COVID-19, >= 2 comorbidities, and lack of HM treatment were independent risk factors for mortality, whereas a lymphocyte count >500/mcl at COVID-19 onset was protective. Conclusions: HM treatment should be delivered as soon as possible for patients with simultaneous diagnosis of COVID-19 and HM requiring immediate therapy.

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Background All-trans retinoic acid (ATRA)-based treatment of acute promyelocytic leukemia (APL) is the most successful pharmacological treatment of acute myeloid leukemia (AML). Recent development of inhibitors of mutated isocitrate dehydrogenase and dihydroorotate dehydrogenase (DHODH) has revived interest in differentiation therapy of non-APL AML. Our previous studies demonstrated that 5-aminoimidazole-4-carboxamide ribonucleoside (AICAr) induced differentiation of monocytic cell lines by activating the ATR/Chk1 via pyrimidine depletion. In the present study, the effects of AICAr on the viability and differentiation of primary AML blasts isolated from bone marrow of patients with non-APL AML were tested and compared with the effects of DHODH inhibitor brequinar and ATRA. Methods Bone marrow samples were obtained from 35 patients and leukemia blasts were cultured ex vivo. The cell viability was assessed by MTT assay and AML cell differentiation was determined by flow cytometry and morphological analyses. RNA sequencing and partial data analysis were conducted using ClusterProfiler package. Statistical analysis was performed using GraphPad Prism 6.0. Results AICAr is capable of triggering differentiation in samples of bone marrow blasts cultured ex vivo that were resistant to ATRA. AICAr-induced differentiation correlates with proliferation and sensitivity to DHODH inhibition. RNA-seq data obtained in primary AML blasts confirmed that AICAr treatment induced downregulation of pyrimidine metabolism pathways together with an upregulation of gene set involved in hematopoietic cell lineage. Conclusion AICAr induces differentiation in a subset of primary non-APL AML blasts, and these effects correlate with sensitivity to a well-known, potent DHODH inhibitor.

Daratumumab je prvo monoklonsko protutijelo anti- CD38 koje se primjenjuje u liječenju multiplog mijeloma. Njegova primjena uzrokuje panreaktivnost u testovima prijetransfuzijskog ispitivanja. Panreaktivnost je posljedica vezanja monoklonskog protutijela anti- CD38 na protein CD38 na površini eritrocita, što u standardnom testiranju onemogućuje otkrivanje antieritrocitnih aloprotutijela i osiguranje podudarne krvi za transfuzijsko liječenje. Cilj rada bila je retrospektivna analiza vlastitih iskustava u rješavanju smetnja prijetransfuzijskog ispitivanja uzrokovanih monoklonskim protutijelom anti-CD38 i u transfuzijskom liječenju tih bolesnika. Prikazani su postupci za prijetransfuzijsko ispitivanje i transfuzijsko liječenje bolesnika liječenih monoklonskim protutijelom anti-CD38 koji su provedeni u Kliničkome bolničkom centru Zagreb. U istraživanju je analizirano 10- ero bolesnika liječenih daratumumabom. Prije i poslije primjene daratumumaba pretražena su antieritrocitna protutijela i određen je direktan antiglobulinski test. Pri transfuzijskom liječenju napravljeni su test pretraživanja antieritrocitnih protutijela i križne reakcije standardnim testiranjem i specifičnim postupcima imunohematoloških ispitivanja za uklanjanje smetnja monoklonskog protutijela anti- CD38. Postupci su uključivali obradu eritrocita ditiotreitolom koncentracije 0, 2 M i neutralizacijski test uz primjenu reagensa DaraEx. Kod svih bolesnika testovi pretraživanja antieritrocitnih protutijela i križne reakcije bili su nakon primjene daratumumaba pozitivni, dok je direktan antiglobulinski test zbog primjene daratumumaba bio pozitivan u gotovo polovine bolesnika. Nakon obrade eritrocita ditiotreitolom 0, 2 M učestalost lažno pozitivnih rezultata testova pretraživanja antieritrocitnih protutijela i križnih reakcija iznosila je oko 40%, a poslije primjene reagensa DaraEx oko 20%. Oba specifična postupka, obrada eritrocita ditiotreitolom 0, 2 M i neutralizacijski test primjenom reagensa DaraEx, nisu se pokazala dovoljno pouzdanima u rješavanju smetnja uzrokovanih monoklonskim protutijelom anti-CD38. Zato je za transfuzijsko liječenje tih bolesnika nužno osigurati eritrocitne pripravke podudarne prema klinički najvažnijim antigenima u sustavima krvnih grupa Rh, Kell, Kidd, Duffy i MNS. Dobra suradnja između odjela i transfuzijske službe te postojanje protokola za prijetransfuzijsko ispitivanje i transfuzijsko liječenje ostaju preduvjet za pravodobno i sigurno transfuzijsko liječenje te skupine bolesnika.

This multicenter retrospective study investigated serum calprotectin levels in patients with essential thrombocythemia (ET), polycythemia vera (PV) and myelofibrosis (MF). Serum calprotectin levels were higher in ET, PV, and MF patients when compared to healthy controls ; however, there was no difference in serum calprotectin levels between the three disorders. Higher serum calprotectin levels correlated with clinical and laboratory parameters indicative of a higher systemic inflammation. These results suggested that serum calprotectin may be a novel circulatory inflammatory biomarker in patients with myeloproliferative neoplasms.

Acute lymphoblastic leukemia (ALL) is a malignant disease of lymphoid precursors. According to immunophenotype, it is further subdivided into precursor B cell ALL and precursor T cell ALL, with precursor B cell ALL being much more common both in children and adults. Lineage switch from one lymphoid lineage to another during the course of the disease is extremely rarely reported. Here, we describe a case of a child who initially presented as a precursor B-ALL but 15 years later and after two successfully treated relapses of the original ALL presented with early T cell precursor leukemia. Although it was considered as a relapse, it could be interpreted as a case of secondary leukemia, which can be explained as a consequence of treatment as well as a constitutional feature of an individual. Also, it draws attention to the possibility that hematopoietic cells, and in that context also leukemic cells, are much more plastic and capable of reprogramming than previously thought.

Haemoglobinopathies are hereditary disorders of globin chain synthesis and are the most common inherited diseases worldwide. Haemoglobin E is a structural haemoglobin variant characteristic for South East Asian population. We present a rare and unusual finding of haemoglobin E detected in University Hospital Centre Zagreb by capillary zone electrophoresis. Detection of haemoglobin structural variant helped to avoid misdiagnosis of sideropenic anemia and thus potentially harmful therapeutic intervention. In today’s European multiethnic population haemoglobinopathies are a public health issue and Croatian laboratory professionals should be aware of a possibility of finding an unusual haemoglobin pattern.

AIM: To evaluate the clinical utility of incorporating a novel heavy/light chain immunoassay (HLC) into the existing methods for the assessment of multiple myeloma (MM) patients. ----- METHODS: Convenience sera samples from 90 previously treated IgG and IgA MM patients in different disease stages were analyzed. The study was conducted in Clinical Hospital Center Zagreb between 2011 and 2013. The collected sera were analyzed by standard laboratory techniques (serum protein electrophoresis, quantification of total immunoglobulins, serum immunofixation, serum free light chain [FLC] assay) and HLC assay. ----- RESULTS: HLC ratios outside the normal range were found in 58 of 90 patients, including 28 out of 61 patients with total immunoglobulin measurements within the normal range and 5 out of 23 patients in complete response. Both elevated HLC isotype level and abnormal HLC ratio correlated with the parameters of tumor burden, including percentage of plasma cells in the bone marrow (P3.5mg/L were independent risk factors for survival. ----- CONCLUSION: The new HLC assay has greater sensitivity in detecting monoclonal protein, correlates with tumor burden markers, and affects patients' outcome.

Introduction. It has been rarely reported that a laboratory test introduced so rapid and radical changes in diagnostic algorithm as is the case with the quantitative assay of free light chains of immunoglobulins (FLC) in serum and its role in the diagnostic algorithm of monoclonal gammopathies. Since the first description of immunoassay in year 2001 until today, new evidence has continuously been reported in the literature that confirm the clinical usefulness of this test in diagnosis, monitoring and prognosis of monoclonal plasma-proliferative diseases, especially diseases of light chains such as primary amyloidosis, light chain deposition disease (LCDD) or light chain multiple myeloma (LCMM) and nonsecretory multiple myeloma (NSMM). Recently, a commercial test has become available on the market that uses polyclonal antibodies to specific epitopes of free light chains which are hidden in the intact immunoglobulin molecules. In 2011, a commercial immunoassay was launched on the market that uses monoclonal instead of polyclonal antibodies, reducing the variability between different series of reagents and controlling excess antigen in the sample. Aim. The aim of this study was to evaluate monoclonal versus polyclonal antibody and immunoturbidimetric versus immunonephelometric detection technology. Does different detection tehnology – besides different used antibody – contribute to greater variability in results? Method. In this study we compared results of 40 samples measured with polyclonal antibody (The Binding Site Ltd., Birmingham, UK) and monoclonal antibody (N Latex FLC, Siemens Healthcare Diagnostics, Marburg, Germany). In other 40 samples we compared results achieved with different antibodies and different analytical platforms (Siemens Nephelometer with Roche Cobas). Results were statistically analyzed using MedCalc software. Results. Results are shown in Table 1. Comparing all results, it is evident that there is at least proportional error when comparing different antibodies and different analytical systems. Although it is known that immunoturbidimetry is less sensitive than immunonephelometric method, greater discrepancies in results were not found. When we categorized patients as positive and negative according to manufacturer's reference interval for kf/lf ratio, agreement between groups with different antibody and same detection technology was 63% (weighted kappa 0.30). Agreement between groups with different antibodies and different detection technology was 86% (weighted kappa 0.22). Although we have not measured the same samples when testing antibody and analytical platform, the selected analytical platform has, according to our results, no additional impact on the variability of results. Abstract 5680. Table 1. Comparison of FLC results using different antibody and different analytical platforms Method FLC kappa polyclonal Ab Nephelometer Siemens FLC kappa monoclonal Ab Nephelometer Siemens FLC lambda polyclonal Ab Nephelometer Siemens FLC lambda monoclonal Ab Nephelometer Siemens Results (min-max) 6.59-5210.00 6.34-1600.00 1.67-3010.00 1.00-1600.00 Passing-Bablok fit intercept (95% Cl) 8.2442.9255 to 14.9249 1.0945-1.5910 to 5.5631 slope (95% Cl) 0.5950.4564 to 0.7852 1.87981.5336 to 2.1045 Correlation rs (p Conclusion. Physicians and especially clinical biochemists must be aware of the technical shortcomings of this test, such as the variability between different series (lots) reagents, non-linearity, unreliable detection of excess antigen and overestimation of FLC concentrations due to nonspecific interference or polymerization. Although initial results are not discouraging, it will be necessary to collect much more evidence, especially bearing in mind that use of monoclonal antibodies along with advantages has certain disadvantages. In the future, it will probably be necessary to incorporate into the guidelines a recommendation to report the method used, like for other tumor markers. Figure 1 Figure 1. Figure 2 Figure 2. Disclosures No relevant conflicts of interest to declare.

This paper explores how the social landscape of the latter half of the nineteenth century influenced D. D. Palmer and the many occupations he pursued. It focuses on the geographical area where D. D. lived from 1865 to 1898. This paper will show how the American social and economic events of the time provided favourable circumstances for D.D.'s entrepreneurial successes.Cet article examine les facteurs du paysage social de la seconde moitié du dix-neuvième siècle qui ont influencé D. D. Palmer et les nombreuses professions qu’il a exercées en mettant l’accent sur la région géographique où D. D. Palmer a vécu entre 1865 et 1898. L’article montre comment les événements socio-économiques américains de l’époque ont créé les circonstances favorables aux réussites entrepreneuriales de D. D. Palmer.

Objectives: To evaluate the clinical utility of the novel heavy/light chain immunoassay for the assessment of multiple myeloma patients. Methods: Serum samples of 99 multiple myeloma patients in different disease stages (74 IgG, 25 IgA) were analysed. Disease assessement was performed by standard laboratory procedures (SPE, serum IFE, serum free light chain assay [FLC], quantitative immunoglobulins, serum beta-2-microglobulin, as well as basic biochemistry and hematology tests) in addition to bone marrow analysis and the novel heavy/light chain assay (HLC). Serum HLC and FLC measurements were obtained using the polyclonal antisera assay Hevylite™ and Freelite™ respectively (The Binding Site, Birmingham, UK) and performed on a Dade BNII analyser (Siemens). SPE and sIFE were performed on a SEBIA Hydrasis platform. Total immunglobulins were measured using Tina-quant Gen.2 reagents on a Roche Cobas 6000cee platform. Statistical analysis was performed using the R package software (R Development Core Team, Vienna, Austria). Results: The majority of patients (61/99) had total immunoglobulin measurements within normal ranges. However, HLC measurement revealed 16/61 patients to have an abnormal HLC ratio, signifying monoclonality. Furthermore, 5/23 patients who had achieved a complete response (CR) were found to have an abnormal HLC ratio, indicating the presence of residual disease. Subsequently, 2/5 of these patients suffered relapse during the follow-up period. Analysing the entire group of patients, notable statistically significant correlations were observed for the percentage of clonal plasma cells in the bone marrow and an abnormal serum FLC ratio with an abnormal HLC ratio (p=0.0004 and p=0.0001 respectively) as well as an extremely abnormal HLC ratio (40; p=0.003 and p=0.01 respectively). Kaplan-Meier analysis for the entire group showed that overall survival (OS) in patients with abnormal HLC ratios or, in particular, extremely abnormal HLC ratio values was significantly shorter (median survival 31.7 month vs. median not reached, p = 0.021; median 11.8 month vs. 31.7 months; p = 0.0032, respectively, figures 1a and 1b). A significantly shorter time to progression (TTP) was also associated with abnormal or extremely abnormal HLC ratio values (median 21.1 months vs median not reached, p = 0.006; median 11.8 months vs 23.1 months, p = 0.0004; figures 2a and 2b). Interestingly, suppression of the polyclonal isotype pair was also associated with a significantly shorter TTP (median 21.1 months vs median not reached, p = 0.029). In multivariate analysis, abnormal HLC ratio values proved to be an independent prognostic risk factor (p = 0.05; table 1). Conclusion: The novel heavy/light chain allows accurate measurement of monoclonal immunoglobulins and can be more sensitive than standard techniques at detecting residual disease. Abnormal heavy/light chain ratios and immunoglobulin isotype pair suppression may have prognostic significance for multiple myeloma patients. Figure 1. Overall survival in patients stratified according to HLC ratio values. a) Median survival was 31.7 months in patients with abnormal HLC ratio values (dotted line) and was not reached in patients with normal values (full line, p = 0.021). b) the difference is even bigger when patients were stratified by extreme values of HLC ratio (< 0.02 or > 40). Median survival was 11.8 months in patients with extreme HLC ratio values (dotted line) and 31.7 months in patients with less extreme values (full line, p = 0.0032). Figure 1. Overall survival in patients stratified according to HLC ratio values. a) Median survival was 31.7 months in patients with abnormal HLC ratio values (dotted line) and was not reached in patients with normal values (full line, p = 0.021). b) the difference is even bigger when patients were stratified by extreme values of HLC ratio (< 0.02 or > 40). Median survival was 11.8 months in patients with extreme HLC ratio values (dotted line) and 31.7 months in patients with less extreme values (full line, p = 0.0032). Figure 2. Time to progression in patients stratified according to HLC ratio values. a) Median time to progression was 21.1 months in patients with abnormal HLC ratio values (dotted line) and was not reached in patients with normal values (full line, p = 0.006). b) when patients were stratified by extreme values of HLC ratio (< 0.02 or > 40), median time to progression was 11.8 months in patients with extreme HLC ratio values (dotted line) and 23.1 months in patients with less extreme values (full line, p = 0.0004). Figure 2. Time to progression in patients stratified according to HLC ratio values. a) Median time to progression was 21.1 months in patients with abnormal HLC ratio values (dotted line) and was not reached in patients with normal values (full line, p = 0.006). b) when patients were stratified by extreme values of HLC ratio (< 0.02 or > 40), median time to progression was 11.8 months in patients with extreme HLC ratio values (dotted line) and 23.1 months in patients with less extreme values (full line, p = 0.0004). Table 1. Multivariate Cox regression analysis Risk factor Relative risk 95% confidence interval "p" value abnormal IgGκ/IgGλ;IgAκ/IgAλ ratio 3.55 0.96 – 13.20 0.05 HLC isotype absolute value > median 0.73 0.27 – 1.97 0.54 abnormal serum FLC ratio 1.24 0.45 – 3.45 0.68 “low” serum albumin 4.25 1.66-10.88 0.003 “high” beta 2 microglobulin 2.94 1.13-7.68 0.03 Disclosures Last: The Binding Site: Employment.