There have been circulating rumors that using THC for treating a hormonally active breast cancer might cause increased estrogen levels and perhaps increase tumor growth.  As I looked for data, I came across an article discussing THC and estrogen where it seemed pretty clear that THC decreases estrogen effect. So, with decreasing estrogen effect, THC should actually be helpful in treating hormonally sensitive breast cancers. I would not be concerned about using THC in treating breast cancer and generally use it in a 1:1 ratio with CBD.

In addition, Cannabis smoke has anti-estrogenic effects, decreasing serum estrogen, presumably being helping for treating breast cancer.

So, I cannot find any data showing that THC increases estrogen levels, estrogen binding or estrogen effects.

In summary, THC should decreas estrogen effects and binding and this should have anti-tumor effects for hormonally active breast cancers

Allan Frankel, MD Dr Allan Frankel is one of the few physicians in the US who truly understands Cannabis as a medicine. All treatments suggested have been well studied. Every patient seen by Dr Frankel is given a personally created Treatment Plan created with the patient's specific issues defined. Plant medicine requires "tuning" of the dosing. Dr Frankel works with his patients thru a messaging portal. The use of this portal, allows quick and simple follow up contact with Dr Frankel. Patients are not charged for these messages, as this is how Dr Frankel has learned what he has learned. Follow up appointments in person or by phone/video are also available when needed

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