Ken Yamaguchi

Ovarian clear cell carcinoma (CCC) is an aggressive subtype of ovarian cancer that is resistant to conventional chemotherapy, resulting in poor prognosis. CCC develops from endometriosis, which exposes tumor cells to a hypoxic microenvironm…

OBJECTIVE: The treatment effects of lymphadenectomy in early-stage ovarian clear cell carcinoma (OCCC) reported in previous studies may have been overestimated owing to confounding factors. This study aimed to investigate the treatment effe…

[Introduction] Recent studies have revealed pervasive mutations affecting cancer-related genes in many normal tissues, including the endometrium, suggesting their role in cancer development. Endometriosis-associated ovarian cancer (EAOC) is…

Adenosarcoma is a mixed epithelial and mesenchymal neoplasm composed of a malignant mesenchymal component and a benign Müllerian glandular component. Although the endometrium is the most common primary site, adenosarcoma can also occur in t…

The combination therapy of lenvatinib plus pembrolizumab (LP) is increasingly recognized as an important second-line regimen for advanced or recurrent endometrial cancer (EC). However, the safety and efficacy of conversion surgery with low …

A well-differentiated endometrioid carcinoma at the site of extra-uterine/ovarian endometriosis complicates the differentiation between an uncommon metastatic pattern from a corpus cancer and a synchronous primary tumor originating from adj…

OBJECTIVE: Endometriosis is associated with various symptoms, but their severity varies from case to case. In this study, we investigated the reality of symptoms presented by patients with clinically early-stage endometriosis-associated ova…

Primary peritoneal cancer has characteristics similar to high-grade serous carcinomas of ovarian and fallopian tube origin. However, the relationship between endometriosis and primary peritoneal cancer is not well understood. This study foc…

OBJECTIVE: Insomnia is common in patients with cancer. It has a multifactorial etiology that may include the disease process, adverse effects of anticancer therapies, and/or an association with other comorbidities. The purpose of this revie…

Abstract Introduction: The epithelial cells of the endometrium undergo rapid proliferation and shedding each month under the influence of estrogen and progesterone. Recent studies have demonstrated pervasive driver mutations in the endometr…

Supplementary Figure S5. Significance of STAT1-MYC activity in tumorigenesis.

Supplementary Figure S5. Significance of STAT1-MYC activity in tumorigenesis.

Abstract Purpose Endometriosis is associated with various symptoms, but their severity varies widely from case to case. In this research we investigated the reality of symptoms presented by patients with clinically early-stage endometriosi…

More than 10 years following the publication of "The General Rules for Clinical Management of Endometriosis: The second edition" in January 2010, the long-awaited third edition has arrived. The second edition represents the bible for endome…

Polypoid endometriosis is a benign, rare variant of endometriosis that forms polypoid nodules mimicking malignant tumors. For three cases of polypoid endometriosis of female genital organs, this report presents characteristic MR imaging fea…

Clear cell carcinoma (CCC) of the ovary exhibits a unique morphology and clinically malignant behavior. The eosinophilic cytoplasm includes abundant glycogen. Although the growth is slow, the prognosis is poor owing to resistance to convent…

Polypoid endometriosis (PE) is a rare distinctive variant of endometriosis with morphological features resembling malignant tumors. Although a surgical procedure is usually performed for the treatment and diagnosis of PE, fertility preserva…

Ovarian clear cell carcinoma (CCC) exhibits an association with endometriosis, resistance to oxidative stress, and poor prognosis owing to its resistance to conventional platinum-based chemotherapy. A greater understanding of the molecular …

Ovarian seromucinous carcinoma (SMC) is an uncommon neoplasia and is composed predominantly of serous and endocervical-type mucinous epithelium. Due to its low frequency and difficult diagnosis, the natural history, characteristic imaging f…

Low-grade endometrial stromal sarcoma (LG-ESS) is a rare malignant disease and demonstrates various patterns in preoperative imaging. Therefore, accurate diagnosis is important. Given its unique form, we report a case of LG-ESS with a nodul…

BACKGROUND: Somatic PTEN mutation occurs in a proportion of ovarian endometrioid carcinomas. However, these cancers have seldom been reported in diseases associated with germline PTEN variants, such as Cowden syndrome (CS). CASE PRESENTATI…

Squamous cell carcinoma originating in the retroperitoneal cavity is an exceedingly rare disease, and little is known about it. Here, we report the case of primary retroperitoneal squamous cell carcinoma. A 76-year-old gravida four para two…

Endometrioid borderline tumours (EBTs) of the ovary are uncommon tumours of low malignant potential. They consist of atypical endometrioid cells lacking destructive stromal invasion. As the prognosis of EBT is excellent, excessive treatment…

Somatic mutations in the ARID1A tumor-suppressor gene have been frequently identified in ovarian clear cell carcinoma (CCC) cases. BAF250a encoded by ARID1A is a member of the SWI/SNF complex, but the expression and mutation status of other…

Ovarian clear cell carcinoma (OCCC) is a morphologically and biologically distinct subtype of ovarian carcinomas that often arises in ovarian endometriosis. We previously reported that a unique carcinogenic environment, especially iron-indu…