Study sheds light on the mysterious evolution of DNA rings in tumors

Tumors sometimes seem to take on a life of their own, growing at an unusually fast rate or suddenly developing resistance to a cancer drug. This behavior is often explained by cancer genes separating from the cell’s own chromosomes and “striking out on their own” in ring shapes. So far, little has been known about how exactly these DNA rings arise and how they continue to develop as the tumor grows.

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