Breast Leiomyosarcoma, also known as leiomyosarcoma of the breast, is related to leiomyoma and epithelioid leiomyosarcoma. An important gene associated with Breast Leiomyosarcoma is CALD1 (Caldesmon 1), and among its related pathways/superpathways is Hematopoietic Stem Cells and Lineage-specific Markers. Affiliated tissues include breast and smooth muscle.