Early Pregnancy loss (EPL), defined as a pregnancy loss occurring up to 20 weeks gestation, is a very common pregnancy complication, occurring in 12-15% of clinically recognized pregnancies, with increased prevalence associated with increasing maternal age. The use of highly sensitive hCG assays allows the detection of pregnancy earlier in gestation than the time of clinical recognition, and gives an even higher estimated loss of 50-70% of conceptions prior to the second trimester. To achieve a successful pregnancy, a series of strict embryonic and maternal conditions must be met, that include high quality embryos, favorable conditions for embryo implantation, receptive maternal endometrium and optimal uterine environment to sustain the conceptus to term. In addition, maternal immune tolerance and hormonal factors play a critical role. While approximately half of all cases of EPL appear to be due to embryonic aneuploidy, very little is known about the physiologic and pathophysiologic processes that underlie non-aneuploid EPL. As a result, there is also a lack of understanding for the underlying causes of recurrent pregnancy loss (RPL). This NOSI seeks to address these critical knowledge gaps by encouraging basic, translational and clinical studies on biological processes that may uncover potential etiologies of EPL and RPL. This includes research to understand implantation mechanistically and identify a range of key factors, involved in implantation and placentation that are important for early pregnancy establishment, including abnormalities that contribute to sporadic EPL and recurrent pregnancy loss.
This notice applies to due dates on or after September 8, 2022 and subsequent receipt dates through September 8, 2025.
NOT-HD-22-026
This notice applies to due dates on or after September 8, 2022 and subsequent receipt dates through September 8, 2025.
Submit applications for this initiative using one of the following funding opportunity announcements (FOAs) or any reissues of these announcement through the expiration date of this notice.
Sponsor Institute/Organizations: National Institutes of Health
Sponsor Type:
Address: National Institutes of Health; 31 Center Drive; MSC 2220; Bethesda; MD 20892-2220; USA
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Sep 08, 2025
Sep 08, 2025
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Affiliation: National Institutes of Health
Address: National Institutes of Health; 31 Center Drive; MSC 2220; Bethesda; MD 20892-2220; USA
Website URL: https://grants.nih.gov/grants/guide/notice-files/NOT-AA-24-007.html
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