FGFR3 and AL amyloidosis: Interestingly, newly diagnosed multiple myeloma (MM) patients that harbor the t(4;14) translocation often exhibit overexpression of FGFR3 in the absence of activating mutations, while late stage MM patients carrying the same translocation were observed to have activated FGFR3 and multiple myeloma SET domain (MMSET) mutations [137].