Reproductive medicine and biology · 2026
Male Reproductive Phenotype Heterogeneity in Varicocele: A Hypothesis-Generating Threshold-Resilience Framework and Research Agenda.
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Kaltsas Aris, Sofikitis Nikolaos, Chrisofos Michael
Аннотация
BACKGROUND: Varicocele is common in male infertility, yet many affected men retain conventional reproductive measures, and the anatomical grade is an imperfect proxy for phenotype. Established pathways explain injury more clearly than between-person heterogeneity.
METHODS: This structured, critical narrative review searched PubMed from 1 January 2015 to 26 August 2026, with targeted hand-searching. There was no preregistered protocol, dual screening, or risk-of-bias assessment, and coverage is not exhaustive.
MAIN FINDINGS: The threshold-resilience framework is a hypothesis-generating model separating lesion-related exposure, candidate host response measures, and couple-level variables. Human varicocele-specific evidence supports hemodynamic, thermal, redox, and sperm DNA damage associations. No prospective human varicocele study was identified in which an independently measured antioxidant, DNA processing, heat response, or endocrine measure preserved fertility at a given exposure. Female age and ovarian reserve are couple-level variables, and all candidate host response measures remain research-only.
CONCLUSION: Intended for investigators in andrology and reproductive medicine, the framework is a research agenda rather than an explanatory mechanism or clinical algorithm. It maps evidence provenance, identifies measurement gaps, and specifies prospective tests of whether prespecified, outcome-independent host response measures add prediction beyond anatomy, semen analysis, damage measures, and couple-level factors.
METHODS: This structured, critical narrative review searched PubMed from 1 January 2015 to 26 August 2026, with targeted hand-searching. There was no preregistered protocol, dual screening, or risk-of-bias assessment, and coverage is not exhaustive.
MAIN FINDINGS: The threshold-resilience framework is a hypothesis-generating model separating lesion-related exposure, candidate host response measures, and couple-level variables. Human varicocele-specific evidence supports hemodynamic, thermal, redox, and sperm DNA damage associations. No prospective human varicocele study was identified in which an independently measured antioxidant, DNA processing, heat response, or endocrine measure preserved fertility at a given exposure. Female age and ovarian reserve are couple-level variables, and all candidate host response measures remain research-only.
CONCLUSION: Intended for investigators in andrology and reproductive medicine, the framework is a research agenda rather than an explanatory mechanism or clinical algorithm. It maps evidence provenance, identifies measurement gaps, and specifies prospective tests of whether prespecified, outcome-independent host response measures add prediction beyond anatomy, semen analysis, damage measures, and couple-level factors.