First, we compared the 28 cases with high TrkA expression and the clinicopathological features of craniopharyngioma by Fisher’s exact test and found out that cytoplasmic signals of TrkA was significantly higher in the ACP or calcification group, while the mixed membrane–cytoplasmic–nuclear signal was significantly higher in the PCP or non-calcification group (Table 2). Here, NTRK1 is linked to pneumocystosis.