Most cancer research relies on young, healthy mice. Most cancer patients are not young. Could this disconnect between model organism and patient, which ignores the impact of the physiological realities of aging, explain why some therapies perform well in the lab but not in clinical trials? Focusing on lung cancer, a study published in Nature investigated what happens when these two realities, young and old, finally meet in the lab (1). The answers could reshape how we think about cancer research and the impact of aging on metastasis and disease progression.

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