TIPARP and ovarian cancer: However, analysis at a more granular level using single-cell RNA-seq data (Izar et al., 2020; Wagner et al., 2020) revealed that (1) the cell types in normal ovarian tissue are different than those in cancerous tissue and (2) malignant cells from ovarian cancer have a higher average PARP7 expression level than any of the normal ovarian cell types (Figure 1—figure supplement 1B).