tokens: We analysed the age incidence curves for symptomatic renal cell carcinoma ( n = 26 ) and cerebellar haemangioblastoma ( n = 68 ) in 109 patients with von Hippel - Lindau ( VHL ) disease , and compared them to 104 patients with sporadic renal cell carcinoma and 43 patients with sporadic cerebellar haemangioblastoma .