Reasoning
The TP53 VCEP version 2.4 specifies that de novo evidence is assessed exclusively with PS2, replacing PM6, and requires de novo points based on confirmed maternity and paternity plus the proband's LFS-associated cancer type. The governing LFS cancer table assigns 4 points for a strongly associated cancer with confirmed maternity and paternity, 2 points when parentage is assumed, 2 points for a moderately associated cancer with confirmed parentage, and 1 point when parentage is assumed; PS2 strength is Supporting at 1 point, Moderate at 2-3 points, Strong at 4-7 points, and Very Strong at 8 or more points. No proband cancer, parental testing or parentage confirmation data are available for this variant, so PS2 cannot be assigned. Searches of Table-of-LFS-Cancers-and-Points-for-PS2-and-PP1-Code-Application.pdf.txt found no entry for c.997_1006del, p.Arg333SerfsTer9, or p.R333Sfs*9; that table provides the governing point rules rather than a variant-specific record.
Rule
TP53 VCEP PS2: de novo points are tallied using confirmed maternity and paternity and the proband's LFS-associated cancer; 1 point = Supporting, 2-3 = Moderate, 4-7 = Strong, and >=8 = Very Strong.
Evidence considered
- The TP53 VCEP version 2.4 states that PM6 is dropped and PS2 is used exclusively for de novo evidence.
- The TP53 VCEP PS2 rule requires tallying de novo points by parentage confirmation and proband cancer type.
- The governing LFS cancer table defines PS2 strength thresholds of Supporting at 1 point, Moderate at 2-3 points, Strong at 4-7 points, and Very Strong at 8 or more points.
- No variant-specific entry was found when searching the governing LFS cancer table for c.997_1006del, p.Arg333SerfsTer9, and p.R333Sfs*9.
Still missing
- No proband cancer diagnosis and age are documented for PS2 point assignment.
- No parental testing or confirmed maternity and paternity are documented.
- No entry for c.997_1006del, p.Arg333SerfsTer9, or p.R333Sfs*9 was found in Table-of-LFS-Cancers-and-Points-for-PS2-and-PP1-Code-Application.pdf.txt.
Sources
cspec ↗vcep_table_of_lfs_cancers_and_points_for_ps2_and_pp1_code_application