Studies have demonstrated that up to 17% of patients with pancreatic neuroendocrine tumours (pNETs) present pathogenic germline variants (PGVs) in several different genes, irrespective of family cancer history. Li-Fraumeni syndrome (LFS) is an autosomal dominant cancer predisposition syndrome related to PGVs in the TP53 gene. A previous case of a pNET associated with LFS (c.1009C > T, p.R337C) has been reported. Here we report the first case of a patient with pNET and TP53 p.R337H and XAF1 p.E134* germline variants, expanding the knowledge of LFS and germline mutations in neuroendocrine tumours.