Table 2. Analysis of the progression-free survival based on the WHO histology and grade of gliomas.

Histology	total	Median PFS (days)	1-year PFS survival rate	2-year PFS survival rate	3-year PFS survival rate	4-year PFS survival rate	5-year PFS survival rate	p value
LGG	100	830	84	55	27	13	7	< 0.0001
pA	50	693	82	50	28	14	8
pO	9	721	67	44	22	22	11
pOA	41	860	90	63	27	10	5
AG	47	495	68	32	15	6
pAA	10	611	70	50	20	10
pAO	5	792	100	60	40
pAOA	32	398	63	22	9	6
pGBM	64	394	52	16	6	2	2

Abbreviations: WHO, World Health Organization; PFS, progression-free survival; LGG, low grade glioma; pA, primary astrocytoma; pO, primary oligodendroglioma; pOA, primary oligoastrocytoma; AG, anaplastic glioma; pAA, primary anaplastic astrocytoma; pAO, primary anaplastic oligodendroglioma; pAOA, primary anaplastic oligoastrocytoma; pGBM, primary glioblastoma.