SDC1 and Miyoshi myopathy: With this new 9E7.4 anti-mouse CD138 mAb, we confirmed our previous results demonstrating that in the 5T33 immunocompetent MM mouse model, a single dose of α-RIT significantly raises median survival (80 vs. 37 days for control, untreated mice) and results in long-term survival for 45% of animals.