The NM_177438.3(DICER1):c.2236A>G variant in DICER1 is a missense variant predicted to cause substitution of arginine by glycine at amino acid 746 (p.Arg746Gly). This variant received a total of 1 phenotype point across 1 proband with pleuropulmonary blastoma, meeting DICER1 VCEP phenotype specificity scoring criteria of 1-1.5 points (PS4_Supporting; PMID: 26925222). This observation was as a de novo occurrence with constitutional mosaicism (PS2; PMIDs:26925222). This variant is absent from gnomAD v2.1.1 and v3.1.2 (non-cancer) (PM2_Supporting). The computational predictor REVEL gives a score of 0.409, which is below the threshold of 0.5, and the splice site predictor SpliceAI indicates that the variant has no impact on splicing, evidence that does not predict a damaging effect on DICER1 function (BP4). In summary, this variant meets the criteria to be classified as Uncertain Significance for DICER1 syndrome based on the ACMG/AMP criteria applied, as specified by the ClinGen DICER1 VCEP: PS4_Supporting, PS2, PM2_Supporting, BP4. (Bayesian Points: 5; VCEP specifications version 1.2.0; 08/22/2023)