Fig. 2From: Procalcitonin expression in patients with large cell neuroendocrine carcinoma of the lungSerial changes of serum PCT levels in a patient with LCNEC. In a male patient with stage IV LCNEC, serum PCT level was around 20Â ng/mL while the disease was controlled by 4 cycles of chemotherapy. Then, the PCT level was elevated as the disease progressed after the end of chemotherapy. CTx chemotherapyBack to article page