“…Callen and Headington (1980) also demonstrated a higher incidence of internal malignancy in patients with Bowen's disease (29.1%) who gave no history of arsenic ingestion. These studies Helwig 1959, 1961;Epstein 1960;Peterka et al 1961;Hugo and Conway 1967;Callen and Headington 1980) supported the concept of a relationship between Bowen's disease and internal malignancy. On the other hand, when Andersen et al (1973) used incidence rates of internal malignancies among the general population by age, sex, and year for comparison and employed the Danish Cancer Registry, death certificates and questionnaires to identify cancer cases, their findings failed to support this view.…”