The NM_177438.3:c.1157A>G variant in DICER1 is a missense variant predicted to cause substitution of lysine by arginine at amino acid 386 (p.Lys386Arg). This variant has been observed in trans with the variant c.3091C>T, p.Gln1031Ter (Internal lab contributors) which would be classified as pathogenic/likely pathogenic by the ClinGen DICER1 VCEP specifications (BP2). This variant has been seen in 10 or more unrelated females without tumors through age 50 in at least one testing laboratory (BS2_Supporting; Internal lab contributors). The total allele frequency in gnomAD v4.1.0 is 0.00001053 (17/1614068 alleles) with a highest population minor allele frequency of 0.00001356 (16/1180004 alleles) in European (non-Finnish) population (PM2_Supporting, BS1, and BA1 are not met). In silico tools predict no damaging impact of the variant on protein function (REVEL: 0.123; MaxEntScan and SpliceAI: no effect on splicing) (BP4). In summary, this variant meets the criteria to be classified as Likely Benign for DICER1-related tumor predisposition based on the ACMG/AMP criteria applied, as specified by the ClinGen DICER1 VCEP: BS2_supporting, BP2, BP4. (Bayesian Points: -3; VCEP specifications version 1.3.0; 08/27/2024)