Table 1 Comparison of background, treatment and causes of death in DLBCL patients with MPM according to IPI risk groups

IPI	Low			Low-intermediate			High-intermediate			High
MPM	+	−	P	+	−	P	+	−	P	+	−	P
N	32	198		31	142		30	166		30	180
Age
Median
≤ 60	2	78	<0.001	4	30	0.3	6	33	0.99	0	19	0.06
≥ 61	30	120		27	112		24	133		30	161
Gender
Female	11	83	0.42	13	62	0.86	13	73	0.95	11	80	0.43
Male	21	115		18	80		17	93		19	100
Stage
I and II	32	193	0.36	26	69	< 0.001	6	29	0.74	2	6	0.16
III and IV	0	5		5	73		24	137		28	174
Treatment
R-CHOP like regimen	27	183	0.13	26	130	0.04	26	146	0.54	27	157	0.7
Intensive chemotherapy	0	5		3	1		2	8		2	6
Treatment for PCNSL	1	2		0	3		1	3		0	2
Others	2	2		1	2		1	2		0	5
Unknown	2	6		1	6		0	8		1	10
Cause of death			0.17			0.36			0.12			0.007
Number of death
All death	8	24	0.051	10	28	0.13	12	52	0.35	22	85	0.008
Death by DLBCL	3	9	0.25	5	16	0.45	6	33	0.99	16	64	0.06
Death by other PCs	0	2	0.57	1	1	0.23	3	3	0.02	1	0	0.01
Death by other causative	5	13	0.08	4	11	0.36	3	16	0.95	5	21	0.44

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