MEN1 and neoplasm: There was no difference between functioning and non-functioning tumours (median: 59 vs. 89 months, p = 0.710), as well as between sporadic and MEN1 (median: 59 vs. 89 months, p = 0.533) and between Octreoscan / 68Ga-PET positive and negative (median: 89 months vs. median not reached, p = 0.965).