MUC5AC and cancer: It is noted that the void-volume peaks obtained from other cancer cell lines known to secret MUC5AC, such as HT-29 [21], LS 174T [23], SW1990 [24], CFPAC-1 [25], and Calu-3 [26], were all tested positive for reactivity with hPAM4 (Supplementary Figure S1).