Table 1: RQ-PCR analysis in tumor cells for BKV, JCV and SV40

Tumors	No. of samples	HPyV positive
Leukemias and lymphomas
B-cell acute lymphoid leukemia	30
T-cell acute lymphoid leukemia	30
Acute myeloid leukemia	30	1 (JCV)
Chronic myeloid leukemia	30
Non Hodgkin's lymphoma	381
Hodgkin's lymphoma	33
Solid tumors
Neuroblastoma	39
Wilms' tumor	30
Ewing's sarcoma	30
Rhabdomyosarcoma	352
Osteosarcoma	30
Ependymoma	30
Medulloblastoma	30
Glioblastoma	30
Oligodendroglioma	30	1 (JCV)
Astrocytoma	30
Total	505

¹ including 29 B- and 9 T-Non Hodgkin's lymphoma specimens
² including 26 embryonal and 9 alveolar rhabdomyosarcoma specimens