UCA1 and chronic myelogenous leukemia, BCR-ABL1 positive: We also obtained similar results for HIF1A-AS and UCA1. The antisense long noncoding RNA hypoxia inducible factor 1alpha antisense RNA-2 (HIF1A-AS2), which was located in chromosome 14q23.2, was reported overexpressed in several tumor tissues, such as chronic myeloid leukemia and neuroblastoma,[32] but the studies about the exact significance of HIF1A-AS2 ware limited.