To investigate the dependence of PKMYT1i on CCNE1 level in OVCA cells (OVCAR3, FUOV1, COV318, OVCAR8, OVSAHO, Kuramochi, WO-20, SKOV3) and EMCA cells (KLE, MFE280, SNU685), RP-6306 efficacy in cancer cells with CCNE1 amplification (CCNE1AMP), CCNE1 copy gain (CCNE1GAIN), or CCNE1 neutral (CCNE1LOW) was investigated. Here, CCNE1 is linked to cancer.