{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,29]],"date-time":"2026-05-29T23:26:09Z","timestamp":1780097169730,"version":"3.54.0"},"reference-count":34,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2023,3,2]],"date-time":"2023-03-02T00:00:00Z","timestamp":1677715200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"CAMS Innovation Fund for Medical Sciences","award":["2019-I2M-5-001"],"award-info":[{"award-number":["2019-I2M-5-001"]}]},{"name":"CAMS Innovation Fund for Medical Sciences","award":["81730038"],"award-info":[{"award-number":["81730038"]}]},{"name":"CAMS Innovation Fund for Medical Sciences","award":["Z191100006619073"],"award-info":[{"award-number":["Z191100006619073"]}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["2019-I2M-5-001"],"award-info":[{"award-number":["2019-I2M-5-001"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["81730038"],"award-info":[{"award-number":["81730038"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["Z191100006619073"],"award-info":[{"award-number":["Z191100006619073"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Beijing Municipal Science &amp; Technology Commission","award":["2019-I2M-5-001"],"award-info":[{"award-number":["2019-I2M-5-001"]}]},{"name":"Beijing Municipal Science &amp; Technology Commission","award":["81730038"],"award-info":[{"award-number":["81730038"]}]},{"name":"Beijing Municipal Science &amp; Technology Commission","award":["Z191100006619073"],"award-info":[{"award-number":["Z191100006619073"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JCM"],"abstract":"<jats:p>Background: According to the latest practice committee document, in vitro maturation (IVM) is a simple and safe procedure, especially in patients with polycystic ovary syndrome (PCOS). Does switching from in vitro fertilization (IVF) to IVM (IVF\/M) help as a rescue infertility treatment for PCOS patients with an unexpected poor ovarian response (UPOR) tendency? Methods: This retrospective cohort study included 531 women with PCOS who had undergone 588 natural IVM cycles or had switched to IVF\/M cycles from 2008 to 2017. Natural IVM was performed in 377 cycles, and switching IVF\/M was performed in 211 cycles. The primary outcome measure was the cumulative live birth rates (cLBRs), and the secondary outcomes included laboratory and clinical outcomes, maternal safety, and obstetric and perinatal complications. Results: No significant difference was found in the cLBRs between the natural IVM and switching IVF\/M groups (23.6% vs. 17.4%, p = 0.05). Meanwhile, the natural IVM group had a higher cumulative clinical pregnancy rate (36.0% vs. 26.0%, p = 0.01), and a decrease in the number of oocytes was obtained in the switching IVF\/M group (13.5 vs. 12.0, p &lt; 0.01). The number of good quality embryos in the natural IVM group was 2.2 \u00b1 2.5, and 2.1 \u00b1 2.3 (p = 0.64) in the switching IVF\/M group. No statistically significant differences were observed in the number of 2 pronuclear (2PN) and available embryos. Ovarian hyperstimulation syndrome (OHSS) did not occur in the switching IVF\/M and natural IVM groups, indicating a highly favorable outcome. Conclusion: In PCOS infertile women with UPOR, timely switching IVF\/M is a viable option that markedly reduces the canceled cycle, results in reasonable oocyte retrieval, and leads to live births.<\/jats:p>","DOI":"10.3390\/jcm12051978","type":"journal-article","created":{"date-parts":[[2023,3,2]],"date-time":"2023-03-02T03:06:43Z","timestamp":1677726403000},"page":"1978","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Effectiveness, Flexibility and Safety of Switching IVF to IVM as a Rescue Strategy in Unexpected Poor Ovarian Response for PCOS Infertility Patients"],"prefix":"10.3390","volume":"12","author":[{"given":"Wei","family":"Guo","sequence":"first","affiliation":[{"name":"Centre for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China"},{"name":"National Clinical Research Centre for Obstetrics and Gynecology, Beijing 100191, China"},{"name":"Key Laboratory of Assisted Reproduction, Peking University, Ministry of Education, Beijing 100191, China"},{"name":"Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoying","family":"Zheng","sequence":"additional","affiliation":[{"name":"Centre for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China"},{"name":"National Clinical Research Centre for Obstetrics and Gynecology, Beijing 100191, China"},{"name":"Key Laboratory of Assisted Reproduction, Peking University, Ministry of Education, Beijing 100191, China"},{"name":"Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China"},{"name":"Research Units of Comprehensive Diagnosis and Treatment of Oocyte Maturation Arrest, Chinese Academy of Medical Sciences, Beijing 100006, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Danni","family":"Zheng","sequence":"additional","affiliation":[{"name":"Centre for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China"},{"name":"National Clinical Research Centre for Obstetrics and Gynecology, Beijing 100191, China"},{"name":"Key Laboratory of Assisted Reproduction, Peking University, Ministry of Education, Beijing 100191, China"},{"name":"Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zi","family":"Yang","sequence":"additional","affiliation":[{"name":"Centre for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China"},{"name":"National Clinical Research Centre for Obstetrics and Gynecology, Beijing 100191, China"},{"name":"Key Laboratory of Assisted Reproduction, Peking University, Ministry of Education, Beijing 100191, China"},{"name":"Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuo","family":"Yang","sequence":"additional","affiliation":[{"name":"Centre for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China"},{"name":"National Clinical Research Centre for Obstetrics and Gynecology, Beijing 100191, China"},{"name":"Key Laboratory of Assisted Reproduction, Peking University, Ministry of Education, Beijing 100191, China"},{"name":"Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui","family":"Yang","sequence":"additional","affiliation":[{"name":"Centre for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China"},{"name":"National Clinical Research Centre for Obstetrics and Gynecology, Beijing 100191, China"},{"name":"Key Laboratory of Assisted Reproduction, Peking University, Ministry of Education, Beijing 100191, China"},{"name":"Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rong","family":"Li","sequence":"additional","affiliation":[{"name":"Centre for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China"},{"name":"National Clinical Research Centre for Obstetrics and Gynecology, Beijing 100191, China"},{"name":"Key Laboratory of Assisted Reproduction, Peking University, Ministry of Education, Beijing 100191, China"},{"name":"Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China"},{"name":"Research Units of Comprehensive Diagnosis and Treatment of Oocyte Maturation Arrest, Chinese Academy of Medical Sciences, Beijing 100006, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2126-1376","authenticated-orcid":false,"given":"Jie","family":"Qiao","sequence":"additional","affiliation":[{"name":"Centre for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China"},{"name":"National Clinical Research Centre for Obstetrics and Gynecology, Beijing 100191, China"},{"name":"Key Laboratory of Assisted Reproduction, Peking University, Ministry of Education, Beijing 100191, China"},{"name":"Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Beijing 100191, China"},{"name":"Research Units of Comprehensive Diagnosis and Treatment of Oocyte Maturation Arrest, Chinese Academy of Medical Sciences, Beijing 100006, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,3,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Practice Committees of the American Society for Reproductive Medicine, and the Society for Assisted Reproductive Technology (2013). 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Steril."}],"container-title":["Journal of Clinical Medicine"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2077-0383\/12\/5\/1978\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T18:45:54Z","timestamp":1760121954000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2077-0383\/12\/5\/1978"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,3,2]]},"references-count":34,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2023,3]]}},"alternative-id":["jcm12051978"],"URL":"https:\/\/doi.org\/10.3390\/jcm12051978","relation":{},"ISSN":["2077-0383"],"issn-type":[{"value":"2077-0383","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,3,2]]}}}