CCL18 and pancreatic ductal adenocarcinoma: Increased levels of CCL18 in the serum or the tumor are also associated with a worse prognosis for patients of cancers such as breast cancer [39,69,108,173], cutaneous T-cell lymphoma [148], laryngeal squamous cell carcinoma [174], lung cancer [175,176], oral squamous cell carcinoma [182], ovarian cancer [55,177], osteosarcoma [56], pancreatic ductal adenocarcinoma [59,67], and esophageal squamous cell carcinoma [86].