“…15,18,19 One hypothesis, the most likely in our opinion, is that proposed by Boswell and Helwig, 16 which suggests that squamous cell carcinoma of the stomach develops from a metaplastic squamous focus. The existence of this, though very rare, has been described around peptic ulcers, 16 following ingestion of a corrosive agent, 20 in one case of linitis plastica associated with congenital syphilis, 21 and during long-term chemotherapy treatment in a case of lymphocytic lymphoma.…”