His research in the 1970s had focused on tumor viruses because they were thought to alter human genes, thereby causing cancer. (psmag.com)
(There are some exceptions to the rule, as certain tumor viruses demonstrate — see the sad, heroic tale of Nobel laureate Howard Martin Temin, who had the effrontery to challenge said dogma.) (fortune.com)
He was a pioneer in the field of DNA tumor viruses like Polyoma, SV40 and Papilloma. (thevalleefoundation.org)