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.
Learn about this topic in these articles: syphilis. ...Toward the close of the century the principle of insect-borne transmission of disease was established. Serological tests were developed, such as the Widal reaction for typhoid fever (1896) and the Wassermann test for syphilis (1906). An understanding of the principles of immunity led to the development of active immunization to specific diseases.