Pulmonary Veno-Occlusive Disease after Autologous Stem Cell Transplantation.

Pulmonary veno-occlusive disease (PVOD) is an extremely rare condition in oncology practice. Although PVOD is clinically similar to pulmonary arterial hypertension, the conditions differ in terms of pathophysiology, management, and prognosis. This report discusses the case of a 47-year-old woman who developed dyspnea and fatigue after high-dose cyclophosphamide chemotherapy and autologous hematopoietic stem cell transplantation for relapsed lymphoma. The patient exhibited tachycardia, tachypnea, and hypotension, but other findings in the physical examination were unremarkable. The imaging studies showed no evidence of pulmonary embolism, but multiple ground-glass opacities and bilateral pleural effusions were observed on chest high-resolution computed tomography scans. In the right heart catheterization study, the mean pulmonary artery pressure and pulmonary vascular resistance were 35 mm Hg and 5.93 Wood units, respectively, with a normal pulmonary capillary wedge pressure of 10 mm Hg. Pulmonary function tests revealed a remarkable reduction in the percentage predicted value of diffusing capacity of the lungs for carbon monoxide to 31%. Lymphoma progression, collagen diseases, infectious diseases such as human immunodeficiency virus or parasitic infections, portal hypertension, and congenital heart disease were carefully excluded as these are also capable of causing pulmonary arterial hypertension. Thereafter, we reached a final diagnosis of PVOD. The patient was treated with supplemental oxygen and a diuretic during 1 month of hospitalization, which relieved her right heart overload symptoms. Herein, we present the patient's clinical course and diagnostic workup because misdiagnosis or inappropriate treatment can lead to unfavorable outcomes in patients with PVOD.

[Thrombotic microangiopathy with gastrointestinal hemorrhage during carfilzomib therapy for multiple myeloma].

A 70-year-old woman was admitted to the hospital with loss of appetite and melena. She was diagnosed with multiple myeloma 7 years ago and had been on carfilzomib, lenalidomide, and dexamethasone (KRd) therapy for a month because her disease had a relapsed/refractory. On admission, her laboratory tests revealed hemolytic anemia with schizocytes, thrombocytopenia, and acute renal dysfunction. TMA (thrombotic microangiography) caused by carfilzomib was suspected. The possibility of thrombotic thrombocytopenia was considered, and steroid pulse therapy was initiated. Her condition improved significantly after she stopped taking carfilzomib, plasma exchange, hemodiafiltration, steroid pulse therapy, and abstaining from food. The previously reported cases of carfilzomib-induced TMA included fever, gastrointestinal symptoms (nausea/vomiting, diarrhea), and acute renal disorders (lower extremity edema, decreasing urine output). As far as we know, this is the first case of carfilzomib-induced TMA with bleeding as the first symptom.

Clinical entity of cytomegalovirus disease in patients with malignant lymphoma on bendamustine therapy: a single-institution experience.

We investigated the incidence, risk factors, and clinical outcomes of cytomegalovirus (CMV) disease in patients with B-cell lymphoma treated with a bendamustine-containing regimen. The incidence of CMV disease was analyzed after starting treatment with 139 regimens in 126 patients. Clinically significant CMV disease was observed in seven patients. The median duration between bendamustine initiation and the diagnosis of CMV disease was 69 d (range, 40-233), and the median of cycles completed at onset was 2 (range, 1-6). Furthermore, the incidence of CMV disease was significantly higher in the elderly patients than that in the younger patients. The target organs of CMV disease were the liver, gastrointestinal tract, lungs, and retinas. Antiviral therapy was administered to all patients. However, the recurrence of CMV disease was observed in two patients. This study provides information that could contribute to clinicians' decision-making on lymphoma therapy using bendamustine.

von Willebrand factor activity levels are influenced by driver mutation status in polycythemia vera and essential thrombocythemia patients with well-controlled platelet counts.

von Willebrand factor ristocetin cofactor (vWF activity) and platelet count (PLT) are negatively correlated in patients with polycythemia vera (PV) and essential thrombocythemia (ET). However, vWF activity does not always normalize upon controlling PLT in those patients. To address this issue, we investigated the correlation between vWF activity and PLT in PV and ET patients. The negative correlation between vWF activity and PLT was stronger in calreticulin mutation-positive (CALR+) ET than in Janus kinase 2 mutation-positive (JAK2+) PV or ET groups. When PLT were maintained at a certain level (<600 × 109 /L), low vWF activity (<50%) was more frequently observed in JAK2+ PV patients than in JAK2+ ET (p = .013) or CALR+ ET (p = .013) groups, and in PV and ET patients with ≥50% JAK2+ allele burden than in those with allele burden <50% (p = .015). High vWF activity (>150%) was more frequent in the JAK2+ ET group than in the CALR+ ET group (p = .005), and often associated with vasomotor symptoms (p = .002). This study suggests that some patients with JAK2+ PV or ET have vWF activity outside the standard range even with well-controlled PLT, and that the measurement of vWF activity is useful for assessing the risk of thrombosis and hemorrhage.

Clinical impact of central nervous system-directed therapies on intravascular large B-cell lymphoma: A single institution's experience.

Intravascular large B-cell lymphoma (IVLBCL) is a rare subtype of B-cell lymphoma characterized by aggressive disease progression with a high incidence of central nervous system (CNS) involvement. We retrospectively analyzed 16 patients with de novo IVLBCL treated at our hospital between 2004 and 2018 with either standard therapy plus CNS-directed therapy or standard therapy alone. CNS-directed therapy was associated with a significantly better 2-year CNS-free survival (100% vs. 63%, p = 0.0191), despite no significant effects on progression-free or overall survival. Further studies should assess CNS-focused treatment in patients with IVLBCL with or without primary CNS involvement.

Ideal dose intensity of R-CHOP in diffuse large B-cell lymphoma.

INTRODUCTION: The standard of care for diffuse large B-cell lymphoma (DLBCL) is rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone (R-CHOP). However, its ideal dose intensity varies among cases. AREAS COVERED: This review provides the latest insights on the dose intensity of R-CHOP for DLBCL patients. Specifically, we discussed the optimal dose intensity for elderly patients, the optimal number of treatment cycles for limited or advanced-stage diseases, and the role of dose-intensified therapies or adding targeted inhibitors. EXPERT OPINION: Performing a comprehensive or simplified geriatric assessment can distinguish elderly DLBCL patients who will likely benefit from curative R-CHOP. Very elderly or medically unfit patients may need dose reduction in R-CHOP; the Age, Comorbidities, and Albumin index may aid decision-making. Four cycles of R-CHOP followed by two rituximab cycles comprise a new standard for low-risk, limited-stage DLBCL patients. Compared to eight cycles, six cycles of R-CHOP have similar efficacy and fewer toxicities for advanced-stage DLBCL. Dose-intensified therapy is not recommended in most DLBCL cases but may be considered for patients with double (or triple)-hit lymphoma. Applying targeted inhibitors and not merely escalating R-CHOP dose intensity through molecular subtyping will improve the treatment outcome for DLBCL.

Diffuse large B-cell lymphoma (DLBCL) is one of the most common blood cancers. Patients with DLBCL are usually treated with a standard (immuno-) chemotherapy called R-CHOP, which stands for rituximab, cyclophosphamide, hydroxydaunorubicin (doxorubicin), Oncovin, and prednisone. Of these, cyclophosphamide and doxorubicin are particularly toxic but effective. Therefore, the dosages of these drugs are adjusted according to the patient's body size. However, the ideal amounts of these drugs (dose intensity) can vary from case to case. For instance, the regular dose intensity of R-CHOP is too toxic for some people, such as very older patients. Furthermore, ideal total amounts of these drugs, that is, ideal cycle numbers of R-CHOP, are also different between patients with limited disease and advanced disease. Therefore, oncology/hematology researchers have been seeking the optimal dose intensity of R-CHOP in each patient with DLBCL for years. The goal of this review is to provide the latest insights on the ideal dose intensity of R-CHOP in DLBCL treatment. In this article, we discuss: how R-CHOP was established as the standard of care for DLBCL, how to identify candidates for standard R-CHOP among older patients, how to adjust the dose intensity of R-CHOP for patients who are not candidates for standard R-CHOP, optimal cycle number of R-CHOP for limited-disease DLBCL, optimal cycle number of R-CHOP for advanced DLBCL, how to treat patients with a large mass, and the role of more intensive therapies other than R-CHOP in DLBCL treatment. Finally, we demonstrate how experts determined the dose intensity of R-CHOP for some example cases with DLBCL.

Relationship between Carnitine Deficiency and Tyrosine Kinase Inhibitor Use in Patients with Chronic Myeloid Leukemia.

BACKGROUND: Some chemotherapeutic agents cause carnitine deficiency, which causes general fatigue. However, there is no study on carnitine deficiency in patients with chronic myeloid leukemia (CML) during tyrosine kinase inhibitor (TKI) therapy. OBJECTIVE: In this study, we investigated carnitine concentrations in patients with CML receiving TKI therapy. METHOD: This study included patients with well-controlled CML. Total carnitine and free carnitine concentrations were evaluated using the enzyme cycling method. The brief fatigue inventory (BFI) and cancer fatigue scale (CFS) were used to assess general fatigue developed during TKI therapy. RESULTS: Fifty-five patients on TKI therapy were included. Of these, 12 (21.8%) patients had low free carnitine concentrations. Free carnitine concentrations were higher in men than in women. Younger age was closely associated with lower free carnitine concentrations. TKI type, TKI dose, treatment response, or therapy duration were not associated with free carnitine concentrations. None of the scores (the global fatigue score with the BFI and CFS score) correlated with carnitine concentrations. Concentrations of free carnitine in patients in the treatment-free remission group were slightly higher than those in the TKI group, with only 9.1% having a low concentration of free carnitine. CONCLUSION: Carnitine deficiency is probably not a major cause of general fatigue but may occur in patients with CML receiving TKI therapy.

Absolute Lymphocyte Counts After Lenalidomide Initiation may Predict the Prognosis of Patients With Relapsed or Refractory Multiple Myeloma.

Background/Aim: We assessed the prognosis of patients with refractory or relapsed multiple myeloma (RRMM) by focusing on the change in absolute lymphocyte counts (ALCs) after lenalidomide and dexamethasone (Ld) initiation. Patients and Methods: In total, 72 patients with RRMM were treated with Ld. ALCs were evaluated before treatment and at 1, 2, and 3 months after Ld initiation. The median ALCs in the entire cohort before and at 1, 2, 3 months after Ld initiation were 1,131, 1,059, 1,222, and 1,162/µl, respectively. Results: ALCs before Ld initiation did not affect time to next treatment (TNT) or overall survival (OS). However, the patients with ALCs equal to or greater than the median at 3 months showed relatively better TNT than those with lower lymphocyte counts, with a significant difference. OS was also significantly longer in patients with higher ALCs. Conclusion: Immunomodulation by lenalidomide may improve prognosis in patients with RRMM.

Maintenance Therapy With Bortezomib and Dexamethasone for Transplant-ineligible Patients With Multiple Myeloma.

Background/Aim: Here, we investigated whether bortezomib as a maintenance therapy affected outcomes in transplant-ineligible patients with multiple myeloma (MM). Patients and Methods: Following induction therapy with bortezomib, maintenance therapy with bortezomib (1.3 mg/m 2 ) and dexamethasone (20 mg) was administered once or twice every 4 weeks until disease progression. The endpoints of this study were time to next treatment and overall survival. Results: Seventy-six newly diagnosed, transplant-ineligible patients were treated with a bortezomib-based regimen; 28 discontinued induction therapy, 27 did not receive maintenance therapy after induction therapy (the non-maintenance group), and 21 did (the maintenance group). In the three groups, the median times to the next required treatment were 3, 14, and 37 months, respectively. The 3-year overall survival rates were 55%, 69%, and 85%, respectively. There were no significant differences in patient characteristics between the non-maintenance and maintenance groups, except for poorer estimated glomerular filtration rates in the maintenance group. Conclusion: Bortezomib maintenance therapy may be a useful option for transplant-ineligible patients with MM.

MPC-1 expression in myeloma cells is associated with the efficacy of bortezomib therapy.

The use of bortezomib in the clinic has significantly improved outcomes for patients with multiple myeloma (MM), even those harboring high-risk cytogenetic abnormalities or those classified in the high-risk category according to the International Staging System (ISS). In this study, we analyzed the association between immunophenotyping on myeloma cells and the clinical outcomes of patients who received bortezomib-based regimens as first-line therapy. Immunophenotypic analysis before bortezomib therapy was performed by flow cytometry, and whether the immunophenotyping results influenced the clinical outcomes of the patients was investigated. Seventy-four newly diagnosed patients with MM were included in this study. We found that the expression of MPC-1 significantly predicted the time to next therapy (TNT), with a longer TNT in the MPC-1 positive group (p = 0.005), whereas it did not affect overall survival (OS; p = 0.773). In addition, we found that CD45-positivity was associated with shorter TNT (p = 0.0432). Following ISS assessment at treatment initiation, patients who were classified as stage I showed a slightly longer OS compared to those at stage II or III; however, these results were not significant (p = 0.0987). Furthermore, multivariate analysis revealed the prognostic significance of MPC-1 expression, as MPC-1-negativity was associated with a worse TNT. The combination of MPC-1 and CD45 status more sensibly predicted the TNT for bortezomib therapy. Our results demonstrate the clinical importance of immunophenotyping on myeloma cells to determine patient prognoses in this era of novel therapeutic agents.

A novel fusion gene involving PDGFRB and GCC2 in a chronic eosinophilic leukemia patient harboring t(2;5)(q37;q31).

BACKGROUND: Platelet-derived growth factor receptor beta (PDGFRB) rearrangement has been reported in a number of patients with chronic eosinophilic leukemia (CEL), B-acute lymphoblastic leukemia, myeloproliferative neoplasms, and juvenile myelomonocytic leukemia. Here, we report a case of CEL carrying a novel fusion gene involving PDGFRB and GRIP and coiled-coil domain containing 2 (GCC2). PATIENT AND METHODS: A 54-year-old man presenting with a cough and dyspnea was diagnosed with acute eosinophilic pneumonia. Cytogenetic analysis of the bone marrow revealed the presence of t(2;5)(q37;q31). Fluorescence in situ hybridization analysis in the peripheral blood leukocytes revealed the presence of a split signal at PDGFRB gene. Imatinib treatment was effective, and disappearance of t(2;5)(q37;q31) in the bone marrow was confirmed after three months of imatinib therapy. Whole-genome sequencing was performed in peripheral blood leukocytes collected before imatinib therapy. RESULTS: A novel fusion gene between exon 22 of GCC2 and exon 12 of PDGFRB was detected and the presence of GCC2-PDGFRB was confirmed by PCR. CONCLUSION: This is the first case report demonstrating the GCC2 gene as a partner of PDGFRB in the pathogenesis of CEL.

Acute exacerbation of organizing pneumonia leading to sudden death in a patient with sarcoidosis-lymphoma syndrome.

The subject was an 83-year-old female; she had a history of Propionibacterium acnes-related sarcoidosis at the age of 79 years. At diagnosis, she was treated with clarithromycin and achieved remission. Four years later, during a routine physical check-up, she presented with pulmonary opacities and swelling of multiple lymph nodes. A definitive diagnosis of lymphoma could not be made by inguinal lymph node biopsy. The patient's general condition was good, and we observed her clinical course. Oh the 56th day of her illness, she died suddenly. Autopsy revealed diffuse large B-cell lymphoma (DLBCL). Sarcoidosis-lymphoma syndrome (SLS) was diagnosed after sampling hyalinized nodules from both lungs. The cause of death was organizing pneumonia around an epithelioid granuloma and cor pulmonale. Organization markedly increased around the DLBCL. These findings might be associated with cor pulmonale. Although SLS often appears during chronic active sarcoidosis, sudden death is rare and there are few reports on SLS in Japan. We report this case along with a review of the literature.

Lack of Phenotypical and Morphological Evidences of Endothelial to Hematopoietic Transition in the Murine Embryonic Head during Hematopoietic Stem Cell Emergence.

During mouse ontogeny, hematopoietic cells arise from specialized endothelial cells, i.e., the hemogenic endothelium, and form clusters in the lumen of arterial vessels. Hemogenic endothelial cells have been observed in several embryonic tissues, such as the dorsal aorta, the placenta and the yolk sac. Recent work suggests that the mouse embryonic head also produces hematopoietic stem cells (HSCs)/progenitors. However, a histological basis for HSC generation in the head has not yet been determined because the hematopoietic clusters and hemogenic endothelium in the head region have not been well characterized. In this study, we used whole-mount immunostaining and 3D confocal reconstruction techniques to analyze both c-Kit+ hematopoietic clusters and Runx1+ hemogenic endothelium in the whole-head vasculature. The number of c-Kit+ hematopoietic cells was 20-fold less in the head arteries than in the dorsal aorta. In addition, apparent nascent hematopoietic cells, which are characterized by a "budding" structure and a Runx1+ hemogenic endothelium, were not observed in the head. These results suggest that head HSCs may not be or are rarely generated from the endothelium in the same manner as aortic HSCs.

Congenital haptoglobin deficiency discovered on the occasion of anaphylaxis induced by platelet concentrate transfusion.

A 77-year-old man with myelodysplastic syndrome suffered from duodenal perforation after undergoing endoscopic submucosal dissection (ESD) for treatment of duodenal cancer. He presented with hemorrhagic shock, peritonitis and disseminated intravascular coagulation (DIC), and received transfusions of red blood cells (RBC), fresh frozen plasma (FFP), γ-globulin and albumin (Alb). One month after the last RBC transfusion, prolonged thrombocytopenia was observed, and platelet concentrate (PC) was transfused. However, immediately after starting PC transfusion, he developed dyspnea, hypotension and rash, and was thus diagnosed as being in anaphylactic shock. Analysis of the patient's serum revealed absence of haptoglobin (Hp) and the presence of anti-Hp antibody. Further studies, using PCR detected Hpdel, yielded a diagnosis of congenital Hp deficiency. Thus, the anaphylactic shock was considered to have been induced by Hp in the transfused PC reacting with pre-existing anti-Hp antibodies. Thereafter, transfusions were safely carried out with the use of washed PC. Congenital Hp deficiency is relatively prevalent, and in such cases transfusions should be carried out using washed RBC, washed PC and congenital Hp deficiency donor derived FFP to avoid anaphylactic transfusion reactions. Transfusions would be even safer if production of congenital Hp deficiency donor derived PC were to be made available in the future.