PIK3CA and ovarian serous cystadenocarcinoma: The results obtained from TCGA oncomine were similar to those that we obtained from the TCGA genomic dataset from cBioPortal namely KRAS and PIK3CA mRNA expression was significantly upregulated, and PTEN mRNA expression was significantly downregulated (Figure 5D) in ovarian serous cystadenocarcinoma samples as compared to normal ovary samples.