Histiocytic sarcoma: a population-based analysis of incidence, demographic disparities, and long-term outcomes

TO THE EDITOR: Histiocytic sarcoma (HS) is a rare hematopoietic neoplasm derived from non-Langerhans histiocytic cells of the monocyte/macrophage system that is diagnosed using immunohistochemistry markers, such as CD68, lysozyme, CD4, and CD163, on the tissue biopsies.[1][1] HS can occur...