However, several associations have not yet been reported, including overexpression of WNK2 in high-grade B-cell lymphoma, of FAT4 in multiple myeloma, and of LRP1B in hairy cell leukemia (HCL), hairy cell leukemia variant (HCL-V), and marginal zone lymphoma (MZL). The gene discussed is FAT4; the disease is hairy cell leukemia.