People who are HIV-positive are more likely to have both Castleman disease and Kaposi's sarcoma.

CNN: Castleman disease

Gleevec is showing potential in prostate cancer and Kaposi's sarcoma, among other diseases.

FORBES: Magazine Article

Such viruses include the human papilloma virus, which can lead to cervical cancer, and Kaposi's sarcoma, which affects patients with HIV.

BBC: Chicken virus study sheds light on human cancers