Oligosecretary myeloma is a subgroup of multiple myeloma (MM) characterized by low levels of serum and urine monoclonal (M) protein below thresholds of measurable disease (a serum M protein ≥ 1g/dL, a urine M protein ≥ 200mg/day). Patients with oligosecretary myeloma do not have established methods for disease monitoring and clinical informations regarding oligosecretary myeloma are still largely unknown.~In this study, we aimed to investigate the prevalence and clinical course of oligosecretary myeloma.
In this study, the investigators aim to investigate the prevalence and clinical course of oligosecretary myeloma.