Table 3.

Simian virus 40 incidence in brain tumors.

Study (year)	Brain tumors (%)	Source†	Techniques	Ref.
Weiss et al. (1976)	38 ME	Germany	IHC	[104]
Wang et al. (1998)	50 CP; 90 EM	USA	PCR and DNA seq	[106]
Huang et al. (1999)	25 OL; 32 GA 59 LA, AA, SG;	France	PCR, Southern blotting	[107]
Vilchez et al. (2003)	21	Different‡	PCR, IHC	[105]
Rollison et al. (2005)	1.8 GL, MD	USA	PCR, Southern blotting, qRT-PCR	[108]
Kim et al. (2002)	0	USA	PCR	[109]
Montesions-Rongen et al. (2004)	0	German	PCR	[110]
Sabatier et al. (2005)	0 CNS	France	IHC	[111]

^†Source: country of origin of the specimens tested in the study.

^‡Assessment of 13 different reports on primary brain tumors from different sources.

AA: Anaplastic astrocytoma; CNS: CNS-related tumor; CP: Choroid plexus tumor; DNA seq: DNA sequence analysis; EM: Ependymoma; GA: Gemistocytic astrocytoma; GL: Glioma; IHC: Immunohistochemistry; LA: Low-grade astrocytoma; MD: Medulloblastoma; ME: Meningioma; OL: Oligodendroglioma; qRT-PCR: Quantitative real-time PCR; SG: Secondary glioblastoma.