CEACAM5 and neoplasm: Despite the neuromuscular symptoms, abdominal contrast-enhanced CT showed a reduction in liver lesion size (Figure 2A), and the electrochemiluminescence assay showed decreased levels of tumor markers (including carcinoembryonic antigen, carbohydrate antigen [CA] 125, CA 199, and CA 242; Figure 2B) (19), precluding the suspicion of paraneoplastic syndrome due to tumor progression.