Diversity within ovarian cancer subtypes and their tumor microenvironment

Ovarian cancer is the deadliest gynecologic cancer in individuals assigned female at birth. Patients diagnosed with ovarian cancer experience poor survival rates due to frequent late-stage diagnosis and aggressive metastases. Ovarian cancer is often diagnosed at stages III or IV, where survival rates decline substantially. Ovarian cancer comprises several subtypes, each with distinct biological characteristics, clinical behaviors, and treatment responses, thereby complicating the identification of effective therapeutic targets. This review focuses primarily on the most prevalent subtype, high-grade serous carcinoma (HGSC) while also considering less common subtypes such as low-grade serous carcinoma, endometrioid carcinoma, clear cell and mucinous carcinomas. The tumor microenvironment (TME) plays a central role in tumor progression, metastasis, and immune evasion, thereby influencing therapeutic response and patient outcomes. Therefore, understanding the interactions between cancer cells and their microenvironment is essential for developing innovative therapeutic strategies. By identifying subtype-specific biomarkers and disease mechanisms, we can enhance diagnostic accuracy and develop tailored treatment approaches. A deeper understanding of ovarian cancer subtypes and their unique characteristics is vital for advancing patient care, driving innovations in early detection, and ultimately improving survival rates in this complex disease. This review emphasizes the potential for identifying novel biomarkers within the TME, which could facilitate earlier diagnosis and the development of targeted treatments for specific ovarian cancer subtypes, ultimately reducing mortality rates in this challenging cancer landscape.