In the univariable cox regression analysis age (p  = 0.128, hazard ratio  = 1.02 per year, 95% CI: 0.99–1.04) and the maximum tumor diameter (p  = 0.057, hazard ratio  = 1.338 per cm, 95% CI: 0.992–1.805) did not influence PFS, whereas the proliferation index of Ki-67 (p  = 0.003, hazard ratio  = 1.10 per %, 95% CI: 1.03–1.18) did.. Here, MKI67 is linked to neoplasm.