ACTA1 and neoplasm: 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).