<prompt> Answer this question truthfullyHow can Small oat cell lung carcinoma affect the production of hormones in the body, and what is the relationship between this process and the development of Cushing syndrome?  <response>: <reason> Small oat cell lung carcinoma can produce the anterior pituitary hormone ACTH, which can lead to the development of Cushing syndrome. This is a condition in which the body produces too much cortisol due to excess ACTH production. The production of hormones by the tumor can interfere with the bodys normal hormone regulation mechanisms, leading to the development of Cushing syndrome. 