As expected, an upregulation of ALDH1A3 was confirmed in the GBM cases with higher IRS (IRS > 2, lane 6–9), whereas a low protein level of ALDH1A3 was detected in the GBM cases with lower IRS (IRS ≤ 2, lane 3–5). Here, ALDH1A3 is linked to glioblastoma.