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  2. Gynecomastia - Wikipedia

    en.wikipedia.org/wiki/Gynecomastia

    Definition. Gynecomastia is the abnormal non-cancerous enlargement of one or both breasts in men due to the growth of breast tissue as a result of a hormone imbalance between estrogen and androgen. [4][5] Gynecomastia is different from "pseudogynecomastia", [5][6] which is defined as an excess of skin and/or adipose tissue in the male breasts ...

  3. Aromatase inhibitor - Wikipedia

    en.wikipedia.org/wiki/Aromatase_inhibitor

    Aromatase inhibitors (AIs) are a class of drugs used in the treatment of breast cancer in postmenopausal women and in men, [1][2] and gynecomastia in men. They may also be used off-label to reduce estrogen conversion when supplementing testosterone exogenously. They may also be used for chemoprevention in women at high risk for breast cancer.

  4. Letrozole - Wikipedia

    en.wikipedia.org/wiki/Letrozole

    Letrozole, sold under the brand name Femara among others, is an aromatase inhibitor medication that is used in the treatment of breast cancer. [1] It was patented in 1986 and approved for medical use in 1996. [4] In 2021, it was the 222nd most commonly prescribed medication in the United States, with more than 1 million prescriptions.

  5. Klinefelter syndrome - Wikipedia

    en.wikipedia.org/wiki/Klinefelter_syndrome

    Klinefelter syndrome (KS), also known as 47,XXY, is a chromosome anomaly where a male has an extra X chromosome. [ 10 ] These complications commonly include infertility and small, poorly functioning testicles (if present). These symptoms are often noticed only at puberty, although this is one of the most common chromosomal disorders, occurring ...

  6. Side effects of bicalutamide - Wikipedia

    en.wikipedia.org/wiki/Side_effects_of_bicalutamide

    These side effects may occur in as many as 90% of men treated with bicalutamide monotherapy, [29] but gynecomastia is generally reported to occur in 70 to 80% of patients. [30] In the EPC trial, at a median follow-up of 7.4 years, breast pain and gynecomastia respectively occurred in 73.6% and 68.8% of men treated with 150 mg/day bicalutamide ...

  7. Aromatase excess syndrome - Wikipedia

    en.wikipedia.org/wiki/Aromatase_excess_syndrome

    Aromatase excess syndrome (AES or AEXS) is a rarely diagnosed genetic and endocrine syndrome which is characterized by an overexpression of aromatase, the enzyme responsible for the biosynthesis of the estrogen sex hormones from the androgens, in turn resulting in excessive levels of circulating estrogens and, accordingly, symptoms of hyperestrogenism.

  8. Partial androgen insensitivity syndrome - Wikipedia

    en.wikipedia.org/wiki/Partial_androgen...

    Partial androgen insensitivity syndrome (PAIS) is a condition that results in the partial inability of the cell to respond to androgens. [1][2][3] It is an X linked recessive condition. The partial unresponsiveness of the cell to the presence of androgenic hormones impairs the masculinization of male genitalia in the developing fetus, as well ...

  9. Nilutamide - Wikipedia

    en.wikipedia.org/wiki/Nilutamide

    General side effects of NSAAs, including nilutamide, include gynecomastia, breast pain/tenderness, hot flashes (67%), depression, fatigue, sexual dysfunction (including loss of libido and erectile dysfunction), decreased muscle mass, and decreased bone mass with an associated increase in fractures. [19][20][21] Also, nausea (24–27%), vomiting ...