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Objectives: Patients with hematological malignancies have a high risk of mortality from coronavirus disease 2019 (COVID-19). This study aimed to investigate the impact of COVID-19 on mortality rates in patients with various hematological malignancies and to determine risk factors associated with all-cause mortality. Methods: A multicenter, observational retrospective analysis of patients with hematological malignancies infected with COVID-19 between July 2020 and December 2021 was performed. Demographic data, clinical characteristics, and laboratory parameters were recorded. Patients were grouped as non-survivors and survivors. All-cause mortality was the primary outcome of the study. Results: There were 569 patients with a median age of 59 years. Non-Hodgkin lymphoma (22.0%) and multiple myelomas (18.1%) were the two most frequent hematological malignancies. The allcause mortality rate was 29.3%. The highest mortality rates were seen in patients with acute myeloid leukemia (44.3%), acute lymphoid leukemia (40.5%), and non-Hodgkin lymphoma (36.8%). The non-survivors were significantly older (p<0.001) and had more comorbidities (p<0.05). In addition, there were significantly more patients with low lymphocyte percentage (p<0.001), thrombocytopenia (p<0.001), and high CRP (p<0.001) in the non-survived patients. Age = 65years (p=0.017), cardiac comorbidities (p=0.041), and continuation of ongoing active therapy for hematological cancer (p<0.001) were the independent risk factors for the prediction of mortality. Conclusions: In patients with hematological malignancies, coexistent COVID-19 leads to a higher mortality rate in elderly patients with more comorbidities. Acute myeloid and lymphoid leukemia and non-Hodgkin lymphoma have the highest mortality rates. Older age, cardiac diseases, and continuation of ongoing active therapy for hematological cancer are the independent risk factors for mortality in hematological malignancy patients with COVID-19. [ABSTRACT FROM AUTHOR]

Background: Kaposi sarcoma is a low grade angioproliferative disorder which requires infection with human herpes virus 8 for its development. Skin lesions can be observed frequently in chronic lymphocytic leukemia cases, but there is a limited number of cases of Kaposi sarcoma with chronic lymphocytic leukemia in the literature.Case report: Here, we present a case report of an iatrogenic Kaposi sarcoma in a 79-year-old man recently diagnosed with autoimmune hemolytic anemia secondary to chronic lymphocytic leukemia. After treatment with methylprednisolone and rituximab, the patient developed Kaposi sarcoma nodular lesions on his legs. After three courses of oral etoposide for Kaposi sarcoma, the lesions completely disappeared at the end of the third month of treatment.Conclusion: Even though the mortality rate is low with Kaposi sarcoma, it can cause physical and psychological burden for the patients. Additional investigations and raising awareness of Kaposi sarcoma while evaluating the differential diagnosis of skin lesions in chronic lymphocytic leukemia are needed. Short-term oral etoposide was tolerated well in this patient with a good clinical response. [ABSTRACT FROM AUTHOR]