Koji Matsuo, MD, PhD

Diploma of American Board of Obstetrics and Gynecology (Obstetrics & Gynecology)
Diploma of American Board of Obstetrics and Gynecology (Gynecologic Oncology)

• University of Southern California: Excellence in Teaching Award, 2024
• University of Southern California: Excellence in Teaching Award, 2022
• University of Southern California: Excellence in Teaching Award, 2019
• University of Southern California: Excellence in Teaching Award, 2018
• University of Southern California: Excellence in Teaching Award, 2016
• Gynecologic Oncology Group: Young Investigator Award, 2014
• University of Southern California: Fellow Research Award, Outstanding Scientific Research, 2013
• University of Maryland School of Medicine: Excellence in Teaching Award, 2007
• University of Maryland School of Medicine: Gold Humanism Honor Society Award, 2007
• University of Maryland School of Medicine: Excellence in Teaching Award, 2006

• Female career advancement in obstetrics/gynecology, and urology: a spatio-temporal comparative study over the last 2 decades in Germany. Arch Gynecol Obstet. 2026 Sep 03; 313(1).. View in PubMed
• Reply to Correspondence on “Adnexectomy without intra-operative capsule rupture for early ovarian cancer: survival comparison between minimally invasive and open surgery by Matsuo et al” by Ghalleb and Ben Dhiab. Int J Gynecol Cancer. 2026 Aug 11; 104961.. View in PubMed
• Association between hemolysis, elevated liver enzymes, and low platelets syndrome and peripartum cardiomyopathy. Int J Gynaecol Obstet. 2026 Aug 03.. View in PubMed
• Recognizing confounders for the use and outcome associated with intrauterine manipulator during endometrial cancer surgery: a call for research. Int J Gynecol Cancer. 2026 Jul 31; 104890.. View in PubMed
• Nationwide patterns and surgical morbidity associated with delayed hysterectomy for placenta accreta spectrum. Int J Gynecol Cancer. 2026 Jul 30; 104884.. View in PubMed
• Assessment of adjunctive procedures during cesarean hysterectomy for placenta accreta spectrum. Am J Perinatol. 2026 Jul 20.. View in PubMed
• Adnexectomy without intraoperative capsule rupture for early ovarian cancer: survival comparison between minimally invasive and open surgery. Int J Gynecol Cancer. 2026 Jul 11; 36(9):104871.. View in PubMed
• Tobacco Smoking Cessation and Cancer Stage. JAMA Netw Open. 2026 Jul 01; 9(7):e2625423.. View in PubMed
• Enhancing the positive predictive value of early-stage ovarian cancer detection using a two-step machine learning framework. J Transl Med. 2026 Jul 01.. View in PubMed
• Survival assessment of adjuvant chemotherapy for cytology-negative, non-myoinvasive stage IC clear cell endometrial cancer. Am J Obstet Gynecol. 2026 Jun 23.. View in PubMed
• Gestational trophoblastic neoplasia treated with low-dose induction chemotherapy despite prognostic score < 13: a case report. Gynecol Oncol Rep. 2026 Aug; 66:102144.. View in PubMed
• Assessment of laparotomy conversion, unplanned readmission, and perioperative mortality for minimally invasive surgery in endometrial cancer. Am J Obstet Gynecol. 2026 Jun 09.. View in PubMed
• Minimally Invasive Surgery, Intraoperative Capsule Rupture, and Survival in Early Ovarian Cancer. JAMA Oncol. 2026 Jun 01; 12(6):664-666.. View in PubMed
• Decreasing Trends of Tobacco Use Disorder among Pregnant People in the United States. Am J Perinatol. 2026 May 13.. View in PubMed
• Impact of lymphadenectomy on survival outcomes for stage I malignant ovarian germ cell tumors. Gynecol Oncol. 2026 06; 209:40-47.. View in PubMed
• Survival Without Adjuvant Therapy for Low-Risk Endometrial Cancer With Isolated Tumor Cells. JAMA Oncol. 2026 May 01; 12(5):528-530.. View in PubMed
• Clinical characteristics and survival outcome of isolated serous tubal intraepithelial carcinoma. Int J Gynecol Cancer. 2026 06; 36(6):104709.. View in PubMed
• Androgen receptor as a therapeutic target in endometrial cancer: a narrative review. Int J Gynecol Cancer. 2026 06; 36(6):104698.. View in PubMed
• Increasing trends of hospital admissions for unhoused patients in the United States. Sci Rep. 2026 Apr 01; 16(1).. View in PubMed
• Treatment modality-specific survival of small cell neuroendocrine carcinoma of the uterine cervix with T1b3-2b classifications. Int J Gynecol Cancer. 2026 May; 36(5):104644.. View in PubMed
• Nationwide assessment of labor induction at full-term for low-risk pregnancy in the United States from 2018 to 2022. Sci Rep. 2026 Mar 09; 16(1).. View in PubMed
• Assessment of survival and clinicopathologic characteristics associated with lymph node isolated tumor cells in epithelial ovarian cancer. Gynecol Oncol. 2026 Apr; 207:50-56.. View in PubMed
• Role of adjuvant therapy de-escalation for low-grade endometrioid endometrial cancer with adnexal only metastasis: call for research. Int J Gynecol Cancer. 2026 Mar 02; 102832.. View in PubMed
• Survival Association of Intrauterine Manipulator Use During Minimally Invasive Hysterectomy for Endometrial Cancer: A Systematic Review and Meta-analysis. Obstet Gynecol. 2026 Apr 01; 147(4):463-477.. View in PubMed
• Comparison of severe maternal morbidity between pregnancy with subclinical hypothyroidism and overt hypothyroidism. Acta Obstet Gynecol Scand. 2026 Mar; 105(3):499-507.. View in PubMed
• Trends, predictors, and safety of ovarian preservation in premenopausal women with high-grade endometrioid and non-endometrioid endometrial cancers. Gynecol Oncol. 2026 02; 205:46-52.. View in PubMed
• Assessment of maternal characteristics and outcomes associated with COVID-19-linked HELLP-like syndrome. Eur J Obstet Gynecol Reprod Biol. 2026 Feb 20; 318:114959.. View in PubMed
• Phase II clinical trial of nirogacestat in patients with relapsed ovarian granulosa cell tumours. Clin Transl Med. 2026 Jan; 16(1):e70568.. View in PubMed
• Utilization and outcomes of fertility-sparing ovarian cystectomy for stage I malignant ovarian germ cell tumors. Gynecol Oncol. 2026 02; 205:9-16.. View in PubMed
• Clinico-pathological characteristics and survival outcome associated with uterine leiomyosarcoma variants: epithelioid and myxoid types. Int J Gynecol Cancer. 2026 02; 36(2):102842.. View in PubMed
• Response to “Correspondence on ‘Identifying the possible candidate population for adjuvant radiotherapy de-escalation for intermediate-risk cervical cancer’ by Matsuo et al” by Hu Y and Fang Q. Int J Gynecol Cancer. 2026 Feb; 36(2):102840.. View in PubMed
• Relative survival of large cell to small cell neuroendocrine carcinoma of the uterine cervix. Int J Gynecol Cancer. 2026 02; 36(2):102852.. View in PubMed
• Survival assessment of sentinel lymph node biopsy alone without lymphadenectomy for early cervical cancer in real-world data. Gynecol Oncol. 2026 01; 204:174-183.. View in PubMed
• Temporal trends and outcomes of hospitalization for patients with confirmed sexual abuse in the United States. Int J Gynaecol Obstet. 2026 May; 173(2):1130-1132.. View in PubMed
• Effect of COVID-19 pandemic on incidence of pregnancy with tuberculosis: A quasi-experimental analysis. Int J Gynaecol Obstet. 2026 Apr; 173(1):535-537.. View in PubMed
• Hysterectomy Status and Outcomes in Patients With Grade 1, Stage IA Endometrioid Adenocarcinoma. O G Open. 2025 Dec; 2(6):e132.. View in PubMed
• Definition of intermediate risk cervical cancer and histology-specific survival interaction. Int J Gynecol Cancer. 2025 Dec; 35(12):102749.. View in PubMed
• Assessment of overall survival in reproductive-age patients with 2023 International Federation of Gynecology and Obstetrics stage IA1 grade 1 endometrioid endometrial cancer. Int J Gynecol Cancer. 2025 12; 35(12):102745.. View in PubMed
• Association of sentinel lymph node biopsy and isolated tumor cells in cervical cancer. Int J Gynecol Cancer. 2026 04; 36(4):102721.. View in PubMed
• Obstructive sleep apnea in pregnancy: Nationwide assessment of obstetric characteristics and maternal morbidity at delivery. Eur J Obstet Gynecol Reprod Biol. 2025 Dec; 315:114753.. View in PubMed
• Identifying the possible candidate population for adjuvant radiotherapy de-escalation for intermediate-risk cervical cancer. Int J Gynecol Cancer. 2025 Nov; 35(11):102674.. View in PubMed
• Prospective assessment of prognostic significance of malignant peritoneal cytology in endometrial cancer: An NRG Oncology / Gynecologic Oncology Group study on GOG-210 protocol. Gynecol Oncol. 2025 10; 201:184-194.. View in PubMed
• Validation of the 2023 FIGO staging system and its concordance with the JSGO guidelines in endometrial cancer: A multi-institutional retrospective study in Japan. J Obstet Gynaecol Res. 2025 Aug; 51(8):e70049.. View in PubMed
• Obstetric characteristics and maternal outcomes of early second-trimester placenta accreta spectrum. Int J Gynaecol Obstet. 2026 Jan; 172(1):622-629.. View in PubMed
• Clinical and pathological characteristics and outcomes of small cell neuroendocrine carcinoma of the uterine cervix. Int J Gynecol Cancer. 2025 Sep; 35(9):102011.. View in PubMed
• Treatment preferences for acute uncomplicated appendicitis during pregnancy: a qualitative study at a large safety net hospital. J Gastrointest Surg. 2025 Oct; 29(10):102145.. View in PubMed
• Comparing Durvalumab, Olaparib, and Cediranib Monotherapy, Combination Therapy, or Chemotherapy in Patients with Platinum-Resistant Ovarian Cancer with Prior Bevacizumab: The Phase II NRG-GY023 Trial. Clin Cancer Res. 2025 Jun 13; 31(12):2370-2378.. View in PubMed
• Emergency cesarean hysterectomy for placenta accreta spectrum: Estimation of maternal morbidity and mortality. Int J Gynaecol Obstet. 2025 Dec; 171(3):1414-1417.. View in PubMed
• Cytology-negative, non-myoinvasive stage IC serous endometrial cancer: Assessment of adjuvant chemotherapy omission. Gynecol Oncol. 2025 07; 198:146-153.. View in PubMed
• Temporal Trends in Obstetric Care Availability Among U.S. Hospitals by Region and Hospital Setting. Obstet Gynecol. 2025 May 22; 146(2):e43-e48.. View in PubMed
• Glucagon-like-peptide-1 (GLP-1) receptor agonist use and the risk of pulmonary aspiration in patients undergoing surgery. Int J Surg. 2025 Jun 01; 111(6):4090-4093.. View in PubMed
• Association of placenta accreta spectrum and vasa previa. Am J Obstet Gynecol. 2025 Oct; 233(4):e127-e131.. View in PubMed
• Nationwide assessment of COVID-19 ventilator and non-invasive respiratory support burden during the early pandemic in the United States. Sci Rep. 2025 May 02; 15(1):15340.. View in PubMed
• Placenta Accreta Spectrum, Present and Future: The Eunice Kennedy Shriver National Institute of Child Health and Human Development Workshop Summary. Obstet Gynecol. 2025 Jun 01; 145(6):581-585.. View in PubMed
• Analysis of International Classification of Diseases, Tenth Revision, Coding Practices at Referral Centers and Other Obstetric Hospitals for Placenta Accreta Spectrum Disorder. Obstet Gynecol. 2025 Jun 01; 145(6):710-719.. View in PubMed
• Temporal trends of sentinel lymph node biopsy without lymphadenectomy at cervical cancer surgery. Gynecol Oncol. 2025 05; 196:182-191.. View in PubMed
• Local Resection After Cesarean Delivery for Placenta Accreta Spectrum Disorder: A Systematic Review and Meta-analysis. Obstet Gynecol. 2025 Jun 01; 145(6):639-653.. View in PubMed
• Survival effect of adjuvant therapy for low-risk endometrial cancer with isolated tumor cells. Am J Obstet Gynecol. 2025 Aug; 233(2):e43-e45.. View in PubMed
• Racial and ethnic differences in gestational carriers: assessment of obstetric characteristics and outcomes. Fertil Steril. 2025 Sep; 124(3):553-557.. View in PubMed
• International Federation of Gynecology and Obstetrics 2023 stage IIIB2 endometrial cancer with pelvic peritoneal metastasis: assessment of adjuvant therapy effect on survival. Int J Gynecol Cancer. 2025 07; 35(7):101773.. View in PubMed
• Nationwide Assessment of Gestational Age Distribution at Delivery for Patients With Placenta Accreta Spectrum Disorder. Obstet Gynecol. 2025 Jun 01; 145(6):654-663.. View in PubMed
• Histology-specific prognostic significance of isolated tumor cells, micrometastases, and macrometastases in endometrial cancer. Gynecol Oncol. 2025 03; 194:51-59.. View in PubMed
• Modified radical hysterectomy for stage IB1 (≤2 cm) cervical cancer: assessment of temporal trends and oncologic outcomes in the United States. Int J Gynecol Cancer. 2025 06; 35(6):101676.. View in PubMed
• Management of adhesive small bowel obstruction during pregnancy in the United States. J Trauma Acute Care Surg. 2025 06 01; 98(6):915-920.. View in PubMed
• Estimating high-grade serous fallopian tubal carcinoma in the era of tubal hypothesis. Int J Gynecol Cancer. 2025 04; 35(4):101657.. View in PubMed
• Trends, characteristics, and outcomes of pregnancy in women with attention-deficit hyperactivity disorder: A nationwide analysis. Eur J Obstet Gynecol Reprod Biol. 2025 Mar; 306:226-232.. View in PubMed
• Trends and comparisons of palliative care utilization for patients with metastatic gynecologic malignancy. Int J Gynecol Cancer. 2025 04; 35(4):101631.. View in PubMed
• National-level assessment of gestational carrier pregnancies in the United States. J Assist Reprod Genet. 2025 Jan; 42(1):201-211.. View in PubMed
• Suicide Deaths Among Adolescent and Young Adult Patients With Cancer. JAMA Netw Open. 2024 Nov 04; 7(11):e2442964.. View in PubMed
• Adjuvant therapy de-escalation for stage I uterine leiomyosarcoma: A systematic review and meta-analysis. Gynecol Oncol. 2024 12; 191:219-227.. View in PubMed
• Distinct obstetrical characteristics and maternal mortality in patients with hemolysis, elevated liver enzymes, and low platelet count syndrome vs severe preeclampsia: a response. Am J Obstet Gynecol. 2025 Mar; 232(3):e118.. View in PubMed
• Secondary databases in gynecologic cancer research. Int J Gynecol Cancer. 2024 10 07; 34(10):1619-1629.. View in PubMed
• Stage IC grade 1 endometrioid adenocarcinoma of the ovary: assessment of post-operative chemotherapy de-escalation. Int J Gynecol Cancer. 2024 10 07; 34(10):1603-1611.. View in PubMed
• Introduction of advanced maternal age based on mortality-specific severe morbidity. Int J Gynaecol Obstet. 2025 Mar; 168(3):1328-1331.. View in PubMed
• Assessment of early-death in gynecologic malignancy in the United States. Int J Gynaecol Obstet. 2025 Feb; 168(2):838-840.. View in PubMed
• Assessment of postoperative therapy de-escalation for early-stage, intermediate-risk cervical cancer. Int J Gynecol Cancer. 2024 09 02; 34(9):1349-1358.. View in PubMed
• Considerations for route of hysterectomy in low-risk cervical cancer. Int J Gynecol Cancer. 2024 09 02; 34(9):1481.. View in PubMed
• Comprehensive serum glycopeptide spectra analysis to identify early-stage epithelial ovarian cancer. Sci Rep. 2024 08 28; 14(1):20000.. View in PubMed
• Weight-loss therapy in patients with obesity with endometrial intraepithelial neoplasia and uterine cancer. Gynecol Oncol. 2024 11; 190:78-83.. View in PubMed
• Efficacy and safety of minimally invasive surgery versus open laparotomy for epithelial ovarian cancer: A systematic review and meta-analysis. Gynecol Oncol. 2024 11; 190:42-52.. View in PubMed
• Distinct obstetrical characteristics and maternal mortality in patients with HELLP syndrome vs severe preeclampsia. Am J Obstet Gynecol. 2024 Dec; 231(6):e215-e221.. View in PubMed
• Variable clinical and gynecologic characteristics associated with anatomical site of ectopic pregnancy. Int J Gynaecol Obstet. 2025 Jan; 168(1):393-396.. View in PubMed
• Salvage hysterectomy for persistent residual cervical cancer: assessment of prognostic factors. J Gynecol Oncol. 2024 11; 35(6):e113.. View in PubMed
• Incorporation of immunotherapy and biological targeted therapy in primary anti-cancer treatment in gynecologic malignancy. Int J Gynaecol Obstet. 2024 Dec; 167(3):1257-1259.. View in PubMed
• Fertility-preserving treatment for stage IA endometrial cancer: a systematic review and meta-analysis. Am J Obstet Gynecol. 2024 12; 231(6):599-610.e17.. View in PubMed
• Risks and benefits of sentinel lymph node evaluation in the management of endometrial intraepithelial neoplasia. Expert Rev Anticancer Ther. 2024 Aug; 24(8):745-753.. View in PubMed
• Temporal trends of adolescents and young adults (AYA) with gynecologic malignancy in the United States. Gynecol Oncol Rep. 2024 Aug; 54:101455.. View in PubMed
• Temporal Trends and Outcomes of Gender-Affirming Gynecologic Surgery. O G Open. 2024 Sep; 1(3):19.. View in PubMed
• Obstetric Characteristics and Outcomes of Gestational Carrier Pregnancies: A Systematic Review and Meta-Analysis. JAMA Netw Open. 2024 07 01; 7(7):e2422634.. View in PubMed
• Temporal trends of obstetric hemorrhage and product-specific blood transfusion at time of delivery. Am J Obstet Gynecol. 2024 10; 231(4):e139-e145.. View in PubMed
• Association of parental obesity with the profile of metabolic-bariatric surgery patients: a cohort study of the German StuDoQ|MBE registry. BMJ Open. 2024 06 11; 14(6):e079217.. View in PubMed
• Obstetric outcomes of women with congenital uterine anomalies in the United States. Am J Obstet Gynecol MFM. 2024 Aug; 6(8):101396.. View in PubMed
• Primary Cytoreduction and Survival for Patients With Less-Common Epithelial Ovarian Cancer. JAMA Netw Open. 2024 06 03; 7(6):e2417775.. View in PubMed
• Fertility-Sparing Surgery for Stage I Epithelial Ovarian Cancer. Obstet Gynecol. 2024 07 01; 144(1):68-78.. View in PubMed
• A phase 2 trial exploring the significance of homologous recombination status in patients with platinum sensitive or platinum resistant relapsed ovarian cancer receiving combination cediranib and olaparib. Gynecol Oncol. 2024 08; 187:105-112.. View in PubMed
• Pregnancy with endometriosis: Assessment of national-level trends, characteristics, and maternal morbidity at delivery. Eur J Obstet Gynecol Reprod Biol. 2024 Aug; 299:1-11.. View in PubMed
• Levonorgestrel-releasing intrauterine device therapy vs oral progestin treatment for reproductive-aged patients with endometrial intraepithelial neoplasia: a systematic review and meta-analysis. J Natl Cancer Inst. 2024 May 08; 116(5):653-664.. View in PubMed
• Prognostic performance of the 2023 FIGO staging schema for endometrial cancer. Gynecol Oncol. 2024 08; 187:37-45.. View in PubMed
• Identifying Pregnant Patients With Suspected Intimate Partner Violence. Am Surg. 2024 Oct; 90(10):2398-2402.. View in PubMed
• Cesarean hysterectomy for placenta accreta spectrum: Surgeon specialty-specific assessment. Gynecol Oncol. 2024 07; 186:85-93.. View in PubMed

• Roman, Lynda