However, although progression-free survival was related to the expression of KIFC1 mRNA, the knockdown of KIFC1 in two different meningioma cell lines did not show any effect on proliferation, indicating KIFC1 as a dispensable gene for meningioma proliferation which might be due to the upregulation of currently unknown compensatory genes [29,65,67,68,69,70,71,72]. This evidence concerns the gene KIFC1 and meningioma.