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Testosterone is a steroid hormone from the androgen group and is found in humans and other vertebrates. In humans and other mammals, testosterone is secreted primarily by the testicles of males and, to a lesser extent, the ovaries of females. Small amounts are also secreted by the adrenal glands.It is the principal male sex hormone and an anabolic steroid.n average, in adult males, levels of testosterone are about 7â8 times as great as in adult females. As the metabolic consumption of testosterone in males is greater, the daily production is about 20 times greater in men. Females are also more sensitive to the hormone. Testosterone is observed in most vertebrates.
this means that estrogen but not progesterone may be supporting the growth and spread of the cancer cells er pr+ about 2 % of breast cancers are estrogen receptor negative and progesterone receptor positive this means that the hormone progesterone is likely to support the growth of this canceronly a small number of breast cancers test negative for estrogen receptors but positive for progesterone receptorshis means that the cells have receptors for both hormones which could be supporting the growth of the breast cancer er+ pr about 13 % of breast cancers are estrogen receptor positive and progesterone receptor negative