Table 1.

Description of all Lynch syndrome patients.

	Patients ≤ 18 Years at Lynch Syndrome Diagnosis (n = 23)
Age at Lynch syndrome Diagnosis (years)	Range: 6–18
	Median: 16 [15,18]*
Sex (M/F)	10 Female (43.4%)
	13 Male (56.5%)
Known Lynch syndrome Pathogenic Variant	MHL1: 6 (26.1%)
	MSH2: 7 (30.4%)
	PMS2: 5 (21.7%)
	MSH6: 2 (8.7%)
	>1 Pathogenic Variant: 3 (13.0%)
Known family history of Lynch syndrome at Diagnosis	21 (91.3%)
Family History of Lynch syndrome related cancers	Yes- 19 (82.6%)
	No- 2 (8.7%)
	Unclear- 2 (8.7%)
Cancer at time of Lynch syndrome Diagnosis	5 (21.7%)

Table 1: Results are expressed as raw counts with percentage of total patients, unless otherwise specified.

^*Median with quartiles [Q1, Q3].