Abstract
Chemoresistance remains to be a common and significant hurdle with all chemotherapies. Tumors gain resistance by acquiring additional mutations. Some of the chemoresistance mechanisms are known and can be tackled. However, the majority of chemoresistance mechanisms are unknown. Our recent findings shed light on one such unknown mechanism. We identified a novel role for 5-hydroxymethycytosine (5hmC), an epigenetic mark on the DNA, in maintaining the integrity of stalled replication forks and its impact on genomic stability and chemoresistance.