The investigators shall review the early cancer detection unite pathology records for the past 10 years , for cases diagnosed with primary Fallopian tube cancers , cases of high and low grade serous ovarian cancer and cases underwent hysterectomy and salpingectomy for non oncological reasons. Paraffin blocks for suitable selected patients will be examined histologically to confirm the primary diagnosis . Chlamydia DNA in these paraffin blocks of the Fallopian tubes and ovarian tissues will be examined using PCR techniques . The possible correlation between the presence of Chlamydia DNA and the ovarian serous tumours and primary tubal cancer will be analyzed statistically .