SDC1 and Pleural effusion: Other factors associated with improved survival included the absence of CD138 expression (P = 0.0009), age ≥65 years (P = 0.0015), LDH ≤500 U/L (P = 0.0064), the presence of pleural effusion (P = 0.0099), and CD79a expression (P=0.0411).