Histologic Subtypes in Endometriosis-Associated Ovarian Cancer and Ovarian Cancer Arising in Endometriosis: A...

Area of Science:

• Gynecologic Oncology
• Pathology
• Epidemiology

Background:

• The association between endometriosis and ovarian cancer was first described by Sampson in 1925, leading to the definition of endometriosis-associated ovarian cancer (EAOC).
• Scott later proposed a stricter criterion, "ovarian cancer arising in endometriosis" (OCAE), requiring histological evidence of transition from endometriosis to cancer.
• Understanding the differences and similarities in ovarian cancer histotypes between EAOC and OCAE is crucial for elucidating their shared aetiopathological mechanisms.

Approach:

• This systematic review analyzed the distribution of ovarian cancer histotypes across 31 studies encompassing both EAOC and OCAE.
• Data from 800 patients with EAOC and 375 patients with OCAE were included in the analysis.
• Statistical analysis was performed to compare the prevalence of different histotypes between the two classifications.

Key Points:

• The study found no significant differences in the distribution of ovarian cancer histotypes between EAOC and OCAE.
• Clear cell carcinoma (CCC) and endometrioid carcinoma (EC) were the most common subtypes in both groups, though slightly less frequent in EAOC.
• Other histotypes were found in smaller proportions across both classifications.

Conclusions:

• The histological profiles of EAOC and OCAE are similar, suggesting a common aetiopathological pathway.
• These findings indicate that EAOC and OCAE might represent different stages of the same malignant process or distinct progression pathways.
• Further research is warranted to fully explore the shared mechanisms and distinct pathways in the development of endometriosis-related ovarian cancers.