Research Article

The Applicability of the International Staging System in Chinese Patients with Multiple Myeloma Receiving Bortezomib or Thalidomide-Based Regimens as Induction Therapy: A Multicenter Analysis

Table 1

The definition of the ISS system.

ISS stageDefinitionMedian OS

Stage ISβ2M less than 3.5 mg/L plus
serum albumin ≥3.5 g/dL
64 months
Stage IINeither stage I nor stage III44 months
Stage IIISβ2M ≥5.5 mg/L29 months

ISS: International Staging System, OS: overall survival.
Sβ2M: serum beta 2 microglobulin.