Cancer stem cells (CSCs) are crucial for tumor initiation, growth, dissemination, and resistance to therapy. In this study, we aimed to evaluate the effect of inhibiting aldehyde dehydrogenase (ALDH), an enzyme present in endometrial CSCs, using N,N-diethylaminobenzaldehyde (DEAB). This study aimed to evaluate the effects of ALDH inhibition in endometrial cancer stem cells (CSCs). ECC-1 and RL95-2 cell lines were subjected to proteome profiling with and without N,N-diethylaminobenzaldehyde (DEAB).