TP53 and Lynch syndrome: Within the GC group, seven cases (representing 15.5% of the GC cohort and 43.7% of the GC patients with germline test done) were diagnosed with a hereditary syndrome: one Lynch syndrome (MSH2), two ATM hereditary cancer syndromes (ATM), two HDGC (CDH1), one HBOC (BRCA2) and one Li–Fraumeni syndrome (TP53).