Additional file 1: Figure S1. Experimental design to identify niche-mimicking materials using two polymer microarray slides. Figure S2. Comparison of niche-mimicking abilities in five PA531 hydrogels. Figure S3. Statistical analysis of pancreatic cancer patients classified by gene expression of indicated factors evaluated by log-rank and Wilcoxon test. Figure S4. p-values of Kaplan-Meier Survival Analysis by gene expression levels of FETUB or AGT categorized by tumor location and stages