Physical activity levels are positively related to progression-free survival and reduced adverse events in advanced ER<sup>+</sup> breast cancer.

In regards of changes in physical activity behavior results did not reach statistical significance ( p = 0.0691): Remaining active vs. staying insufficiently active (HR: 0.897 [0.728; 1.104]), remaining active vs. becoming insufficiently active (HR: 1.12 [0.857; 1.463]), remaining active vs. becoming active (HR: 1.095 [0.830; 1.446]), becoming active vs. becoming insufficiently active (HR: 1.023 [0.775; 1.350]), becoming active vs. staying insufficiently active (HR: 0.819 [0.657; 1.020]), becoming insufficiently active vs. staying insufficiently active (HR: 0.801 [0.654; 0.981]).

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