In laboratory cell cultures, prolonged exposure to the hormone cortisol increases the growth rate of certain melanoma and breast cancer cells over 72 hours, but does not alter the growth of prostate cancer cells.

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Evidence from Studies

Supporting (1)

27

Community contributions welcome

27

Exercise Duration Modulates Cortisol Release and Chronic Cortisol Exposure Jeopardises T Cell Effector Functions

Randomized Controlled Trial

Human & In Vitro

2026 Jan

When cortisol stays high for a long time, it can make some cancers like melanoma and breast cancer grow faster in the lab, but it doesn’t seem to affect prostate cancer the same way. This matches what the claim says.

Contradicting (0)

0

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Exercise Duration Modulates Cortisol Release and Chronic Cortisol Exposure Jeopardises T Cell Effector Functions

Score: 27

DOI: 10.1111/imm.70028

Similar Assertions

Prolonged exposure to the stress hormone cortisol reduces the ability of immune cells called tumor-specific T cells to destroy cancer cells in laboratory settings, and this reduction lasts even after the cortisol is gone. Short-term exposure to cortisol does not have this effect.

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