| Agent | “Cancer” | Predisposing Conditions |
| Epstein-Barr virus | Burkitt’s lymphoma | Possibly malaria |
| Nasopharyngeal carcinoma | ||
| Herpes hominis | Carcinoma cervix | Promiscuity/venereal infection |
| Papovaviruses (SV 40; JC, BK) | Progressive multifocal encephalopathy | Immunosuppression |
| Unknown virus | Kaposi’s sarcoma | Acquired immunodeficiency syndromes |
| Hepatitis B | Primary hepatocellular carcinoma | Chronic hepatitis B infection |
| Human Papillomaviruses | Genital tumors | Venereal infection |
| T-cell leukemia virus | 1. Sezary syndrome | ___ |
| 2. Mycosis fungoids | ___ |
—C. W. Potter and R. C. Rees, “Viruses, Immunity, and Cancer,” in B. W. Hancock, and A. M. Ward, editors, Immunological Aspects of Cancer (Boston: Martinus Nijhoff Publishing, 1985), pp. 225-229.