NLRP7 in Hydatidiform Mole and Gestational Trophoblastic Neoplasia: From Maternal-Effect Biology to a Genetic Permissiveness Framework for Integrated Cancer Surveillance and Reproductive Decision-Making

Background/Objectives: Biallelic mutations of NLRP7, a maternal-effect gene encoding a key component of the subcortical maternal complex, are the major monogenic cause of recurrent hydatidiform mole (RHM) and confer a substantial lifetime risk of gestational trophoblastic neoplasia (GTN), including choriocarcinoma. Although oocyte donation is currently the standard reproductive option, anecdotal live births from autologous oocytes in carriers of specific missense variants raise mechanistic and clinical questions that have not been integrated. We aimed to synthesize the current understanding of NLRP7 biology, oncogenic mechanisms in GTN, and genotype-stratified reproductive outcomes, and to propose a genetic permissiveness framework that links cancer surveillance with reproductive decision-making. We also place this monogenic disease in an epidemiological context, given the marked geographical variation in molar pregnancy incidence. Methods: PubMed, Embase and Web of Science were searched from January 2006 to December 2025 using terms related to NLRP7, hydatidiform mole, GTN, choriocarcinoma, maternal-effect genes, genomic imprinting, and assisted reproduction. Original studies, case series, expert consensus statements, and reviews were included. Results: NLRP7 loss disrupts subcortical maternal complex assembly, maternal-DMR methylation, trophoblast differentiation, and HLA-C-dependent immune privilege; in choriocarcinoma, NLRP7 is conversely reported to be up-regulated, where it has been implicated in tumor proliferation and immune evasion through inflammasome-independent pathways. Genetic permissiveness for autologous-oocyte pregnancy is mutation-type dependent: complete loss-of-function variants confer near-zero permissiveness, whereas missense variants with retained partial function may permit rare normal pregnancies. Conclusions: A genetic-permissiveness framework integrating variant-level functional data, GTN risk, and reproductive priorities can support shared decision-making in this rare but high-stakes clinical scenario, and it identifies clear directions for future translational research. We emphasize, however, that this framework has not been prospectively validated and should be regarded as hypothesis-generating rather than as a clinically established decision-making model. Recognizing the biallelic NLRP7 mutation as a heritable cancer-predisposition state further supports genotype-informed, risk-stratified oncological surveillance.