Accumulating evidence highlights ALDH1 as a significant cancer stem cell biomarker associated with tumor development, metastasis, and poor prognosis across various cancer types, including breast cancer [19], prostate cancer [20], cervical cancer [21,22,23], liver [24], colorectal cancer [25], and ovarian cancer [26,27]. The gene discussed is ALDH1A1; the disease is ovarian carcinoma.