Surgery (removing the cancer in an operation) is the most common treatment for all stages of colon cancer. A doctor may remove the cancer using one of the following types of surgery: Local excision: If the cancer is found at a very early stage, the doctor may remove it without cutting through the abdominal wall.
The study began in 1932, when syphilis was a widespread problem and there was no safe and effective treatment. The study was designed to measure the progression of untreated syphilis. By 1947, penicillin had been shown to be an effective cure for early syphilis and was becoming widely used to treat the disease.
By the early 18th century syphilis had ceased to be a virulent epidemic disease and became more of the episodic disease it is today. From about the middle of the 19th century to the middle of the 20th century the incidence of syphilis in developed countries declined, except in times of war.