ABCA9 and neoplasm: The postchemotherapy tumor cells showed significantly higher expression of ABC transporters (ABCA12, ABCB5, ABCA9, ABCA6, ABCA10, ABCA8; log fold change > 3.3; P < 1.68 × 104) as well as other known markers of tumor-initiating cells (TICs; ALDH1L1, ALDH1A1, ALDH2, MS4A1/CD20; log fold change > 1.8; P < 9.4 × 104) (Figure 3B) (13, 14).