Fig. 1.

Immunohistochemical (IHC) staining of tumor sections.

A) Hematoxylin and eosin staining of patient's tumor section showing histological findings that are compatible with low-grade serous ovarian cancer. B) Low immunoexpression of Ki-67 protein, which is associated with low proliferative tumors. Wild type like and negative expression patterns were observed for C) p53 and D) BRAF V600E proteins, respectively. E) Microsatellite instability testing demonstrated high expression of mismatch repair proteins, indicative of a MSI stable tumor. IHC of MLH1 protein is shown as an example.