The subsequent quantification of GFAP, α-SMA, CD34, and AQP4 expression levels in tumor tissue using immunofluorescence showed that the expression of α-SMA, AQP4, and GFAP in the tumor area was lower than that in the contralateral area, whereas the expression of CD34 was higher than in the contralateral area (Figure 5C). Here, AQP4 is linked to neoplasm.