NF1 and hereditary neoplastic syndrome: SOM-NET patients were significantly younger (median age: 55 years; 25th–75th: 44–63) than those with conventional NETs (59 years; 25th–75th: 49.5–70, p = 0.048) and more frequently associated with hereditary tumor syndromes (23% vs 3%, p = 0.029), in particular with NF1.