Indicate true (T) and false (F) statements below regarding colorectal cancers. Your answer would be a four-letter string composed of letters T and F only, e.g. TFFF.
( ) Observation of polyps in the colon epithelium of a patient is an indication of a malignant carcinoma.
( ) Progression of colorectal cancer is very slow and normally takes over 10 years to turn into malignancy.
( ) Colorectal cancers are usually diagnosed later in life.
( ) Invasive colorectal cancer cells usually metastasize to lymph nodes via lymphatic vessels and then into the bloodstream.