Human mammary and bronchial carcinomas. In vivo and in vitro secretion of substances immunologically cross‐reactive with insulin

Abstract
In the blood of 2 patients suffering from mammary carcinoma and 1 from bronchial carcinoma, the levels of substances immunologically cross-reactive with insulin (SICRI) were high before surgery; after surgery normoinsulinemia was restored. Direct evidence of SICRI production by the cultured tumorous tissues is presented. Strong daily SICRI fluctuations were observed, and it is proposed that the fluctuations induce instantaneous hypoglycemias experienced by some tumorous patients.