Table 4. Multivariate analysis of risk factors affecting survival outcome.

Variables		RR (95% CI)	p-value
PFS
	Previous ASCT (yes vs. no)	0.41 (0.22–0.78)	0.007
	Ca at diagnosis (mg/dL) (<10 vs. ≥10)	1.86 (0.80–4.33)	0.151
	LDH at diagnosis (U/L) (<450 vs. ≥450)	2.17 (0.15–4.10)	0.018
OS
	Previous ASCT (yes vs. no)	0.38 (0.14–1.03)	0.058
	β2-micro at diagnosis (mg/dL) (<5.5 vs. ≥5.5)	2.20 (0.85–5.71)	0.107
	PLs vs. ELs	2.79 (1.08–7.18)	0.033

Ca, calcium.