qPCR was used to evaluate the levels of exosomal FFAR1, SP9, HIST1H2BG...qPCR results verified the increases in FFAR1 and SP9 and decreases in HIST1H2BG and ITIH2 in Btz-resistant patient-derived exosomes...Our study reveals significant dysregulation of exosomal RNA components in the Btz-resistant group of MM patients as well as several mRNAs that may be used as biomarkers of prognosis of MM patients that are resistant to Btz.