Similarly, the expression of SLC3A2, TUBA1B, TUBA1C, TUBB, FSTL1, and INSIG1 was affected by FIRΔexon2 (Figure 1b), suggesting that FIR and FIRΔexon2 engage in the transcription of various cancer-related mRNAs. Here, INSIG1 is linked to cancer.