MUC5AC and cyst: In addition, Jabbar et al. conducted a phase IIc diagnostic study using targeted MS and reported that mucin-5AC and mucin-2 in cyst fluid could discriminate premalignant/malignant pancreatic cystic lesions from benign lesions with 97% accuracy, and mucin-5AC combined with prostate stem-cell antigen (PSCA) could identify high-grade dysplasia/cancer with 96% accuracy [64].