The results indicated that the expression of these four genes is causally stable in meningiomas (TRPC6: PIVW = 1.09×10−7; XBP1: PIVW = 4.28×10−11; TTC28: PIVW = 7.92×10−5; ODF3: PWald ratio = 7.94×10−8). This evidence concerns the gene XBP1 and meningioma.