Yoichi Kobayashi

AIM: To investigate the differences in lipid metabolism and obesity between patients with ovarian endometrioid carcinoma (OEC) and ovarian clear cell carcinoma (OCCC), both of which are classified as endometriosis-associated Type I ovarian …

BACKGROUND: Early detection of epithelial ovarian cancer (EOC) remains a major clinical challenge. Although serum tumor markers are widely used for detection, their diagnostic performance remains limited. We previously developed a comprehen…

Endometriosis and ovarian endometrioma (OMA) cause dysmenorrhea and infertility. Current hormonal therapies for OMA treatment, may exhibit limited effectiveness. Hormonal treatments function by downregulate estrogen receptors (ERs) via prog…

In this case, a 66-year-old female patient presented with the chief complaint of abdominal distention. Computed tomography and magnetic resonance imaging revealed no enlarged ovaries or obvious primary lesions; however, massive ascites and …

Abstract Endometriosis, a common estrogen-dependent inflammatory disease, and ovarian endometriotic cysts (ECs) cause dysmenorrhea and infertility. Currently available hormonal therapies for EC treatment, are sometimes ineffective. The sig…

Epithelial ovarian cancer (EOC) is widely recognized as the most lethal gynecological malignancy; however, its early-stage detection remains a considerable clinical challenge. To address this, we have introduced a new method, named Comprehe…

Dienogest (DNG), is an effective and widely used progestin used in the treatment of endometriosis, yet clinically, a subset of cases show resistance to DNG treatment. During a previous investigation on the effect of DNG of cytokines and gro…

OBJECTIVE: To examine the incidence and prognostic effects of intraoperative capsule rupture and to assess the effectiveness of postoperative chemotherapy for intraoperative tumor rupture in apparent stage I epithelial ovarian cancer. METH…

OBJECTIVE: To examine the trends of epithelial ovarian cancer histologic subtypes in Japan. METHODS: A nationwide retrospective registry study was performed between 2002 and 2015 (Japan cohort, n = 48,640). Trends were also examined in The…

OBJECTIVES: Endometriotic cyst fluid (ECF) contains a large amount of reactive oxygen species (ROS), and endometriotic cysts are exposed to strong oxidative stress, which may cause malignant transformation. In this study, ROS production by …

OBJECTIVE: The marker for the early diagnosis of endometriotic cyst rupture is unknown. We report a preliminary study designed to evaluate the relationship between plasma D-dimer levels and endometriotic cyst rupture in clinical case series…

Primary retroperitoneal Müllerian adenocarcinoma (PRMA) is an extremely rare tumor and the cause remains unknown. We report a case of PRMA arising from endometriosis. A 52-year-old woman with a history of malignant lymphoma underwent a foll…

Formation of a fistula to a digestive organ is an extremely rare phenomenon in cases of ovarian carcinoma. We report a case of ovarian clear-cell carcinoma complicated by formation of a sigmoid colon fistula, and review the related literatu…