Abstract:DNA topoisomerase IIα (170 kDa, TOP2α/170) is a key homodimeric enzyme resolving DNA topologic entanglements during chromosome dysjunction by introducing transient DNA double‐strand breaks (DSB). TOP2α/170 is also a prominent clinical target for anticancer drugs, such as etoposide (VP‐16), whose clinical efficacy is often compromised due to chemoresistance. We recently demonstrated that parental K562 cells and cloned K562 cells (K/VP.5) with acquired resistance to VP‐16 express a novel truncated TOP2α/90 (90 k… Show more
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