Six ESCC models (KYSE-270, T.T, KYSE-30, KYSE-410, KSYE-510 and COLO-680N) displayed relative Robust Rank Aggregation (α-RRA) scores below −0.5 similar to the known essential genes CDK1, POLR2A and RPA3. In contrast, four cell lines (KYSE-150, KYSE-70, KYSE-140 and KYSE-450) showed no or less dependency (α-RRA scores ≥ −0.5) on SMARCA4. The gene discussed is CDK1; the disease is esophageal squamous cell carcinoma.