Lavage of the Uterine Cavity for the Diagnosis of Ovarian and Tubal Carcinoma - Study of Sensitivity and Specificity

Epithelial ovarian cancer (EOC) is the leading cause of death among gynaecologic malignancies in western civilized countries, with an estimated prevalence in Europe and the US of 752,600 in 2007 and 59,828 deaths annually. Treatment and survival of the patients depend primarily on the stage of the disease. Of all EOC patients only 25% are diagnosed at an early stage while the tumour is confined to the pelvis. In these cases the five-year survival rate is 80% to 90% and the disease can often be cured by the combination of surgery and chemotherapy. Unfortunately, almost 75% of women affected have advanced stage disease with metastatic spread throughout the abdominal cavity or to retroperitoneal lymph nodes at the time of diagnosis; five-year survival rates drop to 10%-30% for advanced disease, despite maximum surgical effort and combination chemotherapy.

Currently, state of the art differential diagnosis between malignant and benign ovarian pathologies suspicious for EOC relies predominantly on transvaginal ultrasonography and serum cancer antigen (CA-125) measurements. The specificity of these diagnostic tools however is low, and both tests are not effective enough to reliably differentiate between benign and malignant conditions. Even in highly specialised units, of all patients receiving surgery for suspected ovarian cancer only about 20% will have a malignant disease. These findings underline the need for new diagnostic tests, able to better differentiate between benign and malignant ovarian changes. This would possibly spear many patients from unnecessary surgery completely and improve the triage of patients with malignant ovarian tumours to highly specialised gynaecologic oncology units.

A promising approach for improvement of differential diagnosis of suspicious ovarian changes has been established by Paul Speiser and Robert Zeillinger (Molecular Oncology Group, Department of General Gynaecology and Gynaecologic Oncology, Medical University of Vienna, Austria) (EK 1148/2011). This approach is called the ALPINE technique (Austrian Lavage Procedure for the Detection of tubal Intraepithelial Neoplasms) (manuscript under preparation). It includes a lavage of the uterine cavity and proximal fallopian tubes and subsequent analysis of this lavage fluid for the presence of pre-malignant and malignant cells.

For the proof of principle that tumour cells are shed from ovarian cancer and can be found in the lavages of the uterine cavity, uterine lavages were collected before a surgical intervention for suspected ovarian malignancy at the investigators' institution and at the Catholic University Leuven, Department of Obstetrics and Gynaecology. After malignancy was confirmed, genetic changes in the TP53 and KRAS gene were determined in tumour tissue. In a set of 9 epithelial ovarian cancer patients (EOC) and 1 ovarian metastases of a signet ring carcinoma, the presence of these genetic changes was examined in lavage samples, using digital droplet PCR (ddPCR). Ten genetic changes were identified in tumour tissue of these patients and 9/10 (90%) of these changes were detected in the corresponding lavage specimen too. Mutation rates were in the range between 0.01% and 39.65% in EOC patients. Furthermore, a filter approach, followed by p53 immunofluorescence staining was established, confirming the presence of tumour cells in the lavage sample of one additional patient.

In a next step, lavage samples of 22 ovarian carcinoma patients, and if applicable corresponding tumour tissue, were analysed through deep sequencing by the group of Bert Vogelstein (Johns Hopkins University, Baltimore, USA). The presence of genetic changes, indicative for ovarian cancer, could be confirmed in 16/22 (72.7%) lavage specimen. Of 18 patients, corresponding tumor tissues were available, showing the same mutation.