{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T14:53:30Z","timestamp":1788274410569,"version":"build-2803163510"},"reference-count":44,"publisher":"SAGE Publications","license":[{"start":{"date-parts":[[2022,1,1]],"date-time":"2022-01-01T00:00:00Z","timestamp":1640995200000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Clin Med\ufffdInsights\ufffdReprod\ufffdHealth"],"published-print":{"date-parts":[[2022,1]]},"abstract":"<jats:p>About 20% of women undergoing in vitro fertilization struggle with poor ovarian response, indicating a poor prognosis related to low response following ovarian stimulation. Indeed, poor ovarian response, that is associated with both high cancelation rates and low live birth rates, still represents one of the most important therapeutic challenges in in vitro fertilization. In this context, natural cycle\/modified natural cycle\u2013 in vitro fertilization, as a \u2018milder\u2019 approach, could be a reasonable alternative to high-dose\/conventional ovarian stimulation in poor ovarian responders, with the aim to retrieve a single oocyte with better characteristics that may result in a single top-quality embryo, transferred to a more receptive endometrium. Moreover, modified natural cycle\u2013 in vitro fertilization may be cost-effective because of the reduced gonadotropin consumption. Several studies have been published during the last 20\u2009years reporting conflicting results regarding the use of natural cycle\/modified natural cycle\u2013 in vitro fertilization in women with poor ovarian response; however, while most of the studies concluded that mild stimulation regimens, including natural cycle\/modified natural cycle\u2013 in vitro fertilization, have low, but acceptable success rates in this difficult group of patients, others did not replicate these findings. The aim of this narrative review is to appraise the current evidence regarding the use of natural cycle\/modified natural cycle\u2013 in vitro fertilization in poor ovarian responders.<\/jats:p>","DOI":"10.1177\/26334941211062026","type":"journal-article","created":{"date-parts":[[2022,1,15]],"date-time":"2022-01-15T02:46:05Z","timestamp":1642214765000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":14,"title":["Poor ovarian response and the possible role of natural and modified natural cycles"],"prefix":"10.1177","volume":"16","author":[{"given":"Federica","family":"Di Guardo","sequence":"first","affiliation":[{"name":"Gynecology and Obstetrics Section, Department of General Surgery and Medical-Surgical Specialties, University of Catania, Catania, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christophe","family":"Blockeel","sequence":"additional","affiliation":[{"name":"Centre for 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