Hormone flare occurs during the use of the LHRH agonist and GnRH agonist. The agonist occupies the receptors of the pituitary gland, and for the first seven to ten days after prostate cancer hormone therapy begins, the levels of testosterone spike. After this period of tumor flare, the level of testosterone drops to castrate levels which slows or stops the growth and spread of prostate cancer. Hormone flare is also known as tumor flare.
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