Furthermore, other case reports and series have published the association of cutaneous xanthomatous tumors [73] and xanthelasma-like lesions fulfilling clinical, histopathological and molecular criteria for ECD associated with CMML, with a proven clonal relationship between skin lesions and CMML cells based on molecular analyses using NGS techniques [74], testicular Rosai–Dorfman disease associated with CMML sharing a KRAS variant c 0.35 G>A/p.G12D in both [75] and also Langerhans cell histiocytosis (LCH) associated with MDS and other hematological neoplasms [76,77]. The gene discussed is KRAS; the disease is Langerhans cell histiocytosis.