PB2031: CD269, CD319 EXPRESSION ON MALIGNANT PLASMA CELLS AND SOLUBLE BCMA, SLAMF7 PROTEINS COMPARATION IN NEWLY DIAGNOSED MULTIPLE MYELOMA PATIENTS - A. Startsev; M. Solovev; V. Dvirnyk; M. Panasenko; I. Galtseva; N. Kapranov; M. Firsova; E. Makunina; A. Abakumova; E. Mamaeva; L. Mendeleeva (HemaSphere, 2022)