"Typical pulmonary carcinoid tumours are considered the more common and more benign low grade form of peripheral pulmonary carcinoid tumours. There is little or no known association between typical carcinoid tumours and tobacco use or exposure to other carcinogens which contrasts to atypical carcinoid tumours which have been reported to have an association with tobacco use 2 ."
"Typical pulmonary carcinoid tumours are considered the more common and more benign low grade form of peripheral pulmonary carcinoid tumours. There is little or no known association between typical carcinoid tumours and tobacco use or exposure to other carcinogens which contrasts to atypical carcinoid tumours which have been reported to have an association with tobacco use 2 ."