Many symptoms of lung cancer are non-specific, leading to further delays in diagnoses.
Since there is no widely recognized method of early lung cancer detection, unlike PSA for prostate cancer or mammography for breast cancer, 85% of lung cancer is found symptomatically.
Unfortunately, by the time symptoms are apparent and properly diagnosed, the lung cancer tends to be in an advanced stage—that is one of the reasons why the 5 year survival rate is only 15%, with nearly half of newly diagnosed patients not surviving thefirst year.