TFE3 and neoplasm: TFE3 overexpression in P4+TFE3+ CAF enhanced tumor sphere formation in LNCaP/22Rv1 cells through PCYT1A‐mediated PC secretion, whereas dual TFE3 overexpression and PCYT1A knockdown (oeTFE3 + shPCYT1A) in P4+TFE3+ CAF reduced spheres (Figure 6K).