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Inherited genetic variation profoundly influences cancer risk and outcome. While the impact of germline single nucleotide polymorphisms has been well-studied in several cancer types, the effects of germline structural variants (gSVs) on cancer biology and clinical outcomes is largely unknown. From our cohort of 300 men with localized, intermediate risk prostate cancer, we identified 6,003 gSVs present in at least 3% of patients; 48 were associated with recurrent somatic alterations or clinical outcome. Of these, approximately 50% were associated with expression of nearby genes or intersected with exons or regulatory regions. Using external cohorts, we validated three gSVs that were strongly associated with poor clinical outcomes, including an inversion at chr14q24.1 present in ~20% of patients. Notably, a strong synergistic effect on outcome was observed in patients with somatic TP53 alterations or high …