DPP9 and ovarian serous carcinoma: In the TCGA dataset of high-grade serous ovarian carcinomas, 7% of the samples had downregulated gene expression of DPP9 without DNA copy number alteration (i.e., 23 of 316 samples, data available at cBio Cancer Genomics Portal, Memorial Sloan-Kettering Cancer Center (MSKCC), www.cbioportal.org, default settings [4, 31, 32]).