ABCB1 RNA levels were also usually elevated in some types of clinically refractory tumors untreated with chemotherapeutic drugs, such as those derived from the colon, kidney, adrenal gland, liver, and pancreas, as well as in carcinoid tumors, chronic myelogenous leukemia in blast crisis, and cell lines of non-small cell lung cancer (NSCLC) with neuroendocrine properties [16,17]. Here, ABCB1 is linked to non-small cell lung carcinoma.