This single cell gene expression database is genenerated by currating and integrating over half a million single-cell transcriptome data of 84 ovarian tumor patients (OvC) across all clinical stages. Gene expression profle of eight major cell types was throghly characterized throughout the OvC progression, including B cells (CD79A, IGHM), endothelial cell (VWF, CLDN5), epithelial cells (KRT18, WFDC2), fibroblasts (DCN, COL1A1), mast cells (KIT, MS4A2), myeloid cells (LYZ, APOE), pericytes (TAGLN, RGS5), and T cells (PTPRC, CD3D).