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Table 1 Amsterdam criteria II and revised Bethesda guidelines.

From: Lynch syndrome: still not a familiar picture

Amsterdam criteria II
There should be at least three relatives with colorectal cancer (CRC) or with a Lynch syndrome associated cancer: cancer of the endometrium, small bowel, ureter or renal pelvis.
- one relative should be a first-degree relative of the other two; - at least two successive generations should be affected, - at least one tumor should be diagnosed before the age of 50 years, - FAP should be excluded in the CRC case if any, - tumours should be verified by histopathological examination.
Revised Bethesda guidelines
1. CRC diagnosed in a patient aged <50 years.
2. Presence of synchronous, metachronous colorectal, or other Lynch syndrome-related tumours*, regardless of age.
3. CRC with MSI-high phenotype diagnosed in a patient aged < 60 years.
4. Patient with CRC and a first-degree relative with a Lynch syndrome-related tumor, with one of the cancers diagnosed aged <50 years.
5. Patient with CRC with two or more first-degree or second-degree relatives with a Lynch syndrome-related tumor, regardless of age.
  1. *Lynch syndrome related tumours include colorectal, endometrial, stomach, ovarian, pancreas, ureter, renal pelvis, biliary tract, and brain tumours, sebaceous gland adenomas and keratoacanthomas and carcinoma of the small bowel