eMedicine Specialties > Pediatrics: General Medicine > Endocrinology
Androgen Insensitivity Syndrome: Treatment & Medication
Updated: Jun 23, 2009
- Overview
- Differential Diagnoses & Workup
- Treatment & Medication
- Follow-up
- Multimedia
Treatment
Medical Care
Medical care for a patient with androgen insensitivity syndrome (AIS) has 2 aspects: hormone replacement therapy (HRT) and psychological support.- HRT
- HRT is the first and less complex aspect. All patients with complete androgen insensitivity syndrome (CAIS) and most patients with all but the mildest forms of partial androgen insensitivity syndrome (PAIS) undergo gonadectomy at some point in their treatment (see Surgical Care). Adolescent and adult patients with androgen insensitivity syndrome require hormone replacement.
- For patients with complete androgen insensitivity syndrome, hormone therapy almost always consists of estrogen replacement. The general belief is that these women do not require progesterone because they have no uterus. Some evidence suggests that progesterone therapy combined with estrogen replacement may lessen the long-term risk of breast cancer, although this type of therapy is debatable. More recent meta-analyses suggest progesterone administration may have little or no advantage for patients without a uterus. Therapy usually is initiated with a low dose of estrogen alone, then is increased to routine adult dosing. Progesterone is added, if considered appropriate, after maintenance therapy with estrogen is established.
- For individuals with partial androgen insensitivity syndrome , traditional therapy has mirrored therapy for individuals with complete androgen insensitivity syndrome. Patients with partial androgen insensitivity syndrome who have a male gender identity, however, may be treated with testosterone and/or dihydrotestosterone (DHT). The advantage of DHT is that it cannot be aromatized to estrogen. No medical consensus has been reached about this therapy; no dosage schedules have been established. Therapy may vary depending on the nature of the gene defect.
- Psychological support
- Psychological support is probably the most important aspect of medical care from the patient's point of view. In a family with an affected infant, the parents are the primary clients. Parents need genetic counseling to understand the nature of the condition and the risk of recurrence (25% for each subsequent pregnancy) as well as to identify other potential carriers. In addition, parents often benefit from the services of a pediatric psychologist or child and adolescent psychiatrist to help adjust to their child's condition, including support on how to inform the child, over time and in an age-appropriate manner, about the condition. Genetic counselors do not provide this type of ongoing family support.
- In a family with an affected older child, the patient is the primary client, although family members also may require psychological services. In these cases, too, pediatric psychologists or child and adolescent psychiatrists are the preferred clinicians because of their medical background and ability to help address medical, emotional, and psychological issues or questions. If at all possible, the therapist also should have experience dealing with patients who have intersex conditions, even if this experience is not specific to androgen insensitivity syndrome. The patient needs to establish a long-term relationship with the therapist to discuss new issues that arise as the child matures. (At times, these visits will be infrequent.) For adults with androgen insensitivity syndrome and other intersex conditions, lack of emotional and psychological support has been a major criticism of the medical care system.
- The primary care practitioner can coordinate medical care for a child with androgen insensitivity syndrome, or coordination may be performed by a pediatric endocrinologist, especially as part of a multidisciplinary team. Carefully maintain communication and coordination among primary care, genetic, endocrinologic, and surgical services to avoid trauma to the child and family.
- Contact with other individuals who have androgen insensitivity syndrome is another source of psychological and emotional support for the patient. The Androgen Insensitivity Syndrome Support Group (AISSG) has constituent organizations in the United States, United Kingdom, and Australia, as well as contacts and/or smaller groups in many European countries. AISSG maintains an excellent Web site at www.medhelp.org/www/ais that provides a large amount of medical information, AISSG contact points, and patients' accounts of their experiences with AIS. This type of contact can markedly decrease feelings of "freakishness" and "being the only one," which patients and families frequently experience.
Surgical Care
- For individuals with androgen insensitivity syndrome, the standard of care is an orchidectomy to prevent possible malignant degeneration of the testes.6 The timing of such surgery has been debated. Historically, early surgery was assumed preferable to avoid raising uncomfortable psychosexual issues during adolescence or young adulthood. More recently, surgery during the late teenage years or early 20s has been preferred. Later orchidectomy allows pubertal development to occur spontaneously with the production of estrogen from the aromatization of the high levels of testosterone normally produced.
- In addition, many women with androgen insensitivity syndrome require vaginal lengthening procedures. Orchidectomy and vaginal lengthening procedures may be performed concurrently if surgery is postponed until the patient matures. Ultrasound examination of the gonads can monitor potential tumor development.
- Vaginal lengthening procedures have stirred ongoing debate. In the past, many vaginal lengthening procedures were performed before or at onset of puberty. Many patient advocates now support delaying these procedures until the patient is sufficiently mature to participate actively in treatment decisions (ie, whether to undergo surgery, what type of procedure).
- Similarly, in female gender patients with partial androgen insensitivity syndrome who have some degree of masculinization of the genitalia at birth, cosmetic reconstructive surgery traditionally has been performed in infancy. Patient advocates, including medical ethicists and intersex advocates, now endorse delaying this reconstructive surgery until children are old enough to decide for themselves. Medical practice and court decisions appear to be moving in this direction as the new standard of care.
Consultations
- Initial consultation for the child with androgen insensitivity syndrome should include a geneticist and a pediatric endocrinologist. These individuals order and interpret the tests required to confirm the diagnosis. Additionally, these clinicians can provide appropriate information about the child's condition. An endocrinologist helps set the future course for medical and surgical therapy.
- Because this is a particularly stressful diagnostic possibility for many families, consult an appropriate mental health professional to provide psychological and emotional support. Part of the mental health professional's role is to facilitate communication between the medical team and the family.
Medication
Hormone replacement therapy (HRT) with estrogens has been the standard of practice for postorchidectomy patients with androgen insensitivity syndrome (AIS). Although most physicians prescribe estrogen alone, some physicians have begun adding progesterone to the regimen, based upon a relatively small amount of data that suggests progesterone may lower the risk of breast cancer, have a role in the ductal development of the breast, or have some role in bone mineral accretion. (These potential benefits are hypothetical.)
Administration of androgens in more masculinized patients with partial androgen insensitivity syndrome (PAIS) has been suggested but remains highly controversial. Because some patients now are assigned male gender and are identifying as males in adulthood, this treatment probably will be described more extensively soon. No data currently describe dosage, administration, benefits, or adverse effects of androgen administration to patients with androgen insensitivity syndrome. Dosage and response likely depends on the severity of the receptor defect. Dihydrotestosterone (DHT) or androgen analogues that cannot be aromatized to estrogen appear to be the treatments of choice.
Estrogens
These agents are used as hormone replacement for women with androgen insensitivity syndrome who are postgonadectomy to support development and maintenance of secondary sexual characteristics and to prevent osteoporosis.
Conjugated estrogens (Premarin)
Represents the average composition of estrogens in pregnant mare urine. Composed of estrone, equilin, 17-alpha estradiol, equilenin, and 17-alpha dihydroequilenin (in small amount). Rapidly biotransformed after administration.
Adult
0.3-0.625 mg PO qd
If cycling with progesterone, administer on days 1-21 of cycle
Pediatric
In girls who are orchidectomized prepubertally, start estrogens at lowest available dose, preferably when bone age is at least 13 y
Appropriate beginning dose: 0.3 mg qod; then gradually increase dose to mimic normal female puberty until adult levels achieved
May reduce hypoprothrombinemic effect of anticoagulants; coadministration of barbiturates, rifampin, and other agents that induce hepatic microsomal enzymes may reduce estrogen levels; increased pharmacologic and toxicologic effects of corticosteroids may occur via inactivation of hepatic P450 enzyme; loss of seizure control has been observed when administered concurrently with hydantoins
Documented hypersensitivity; avoid in patients diagnosed with breast cancer, undiagnosed abnormal genital bleeding, active thrombophlebitis or thromboembolic disorders, or in patients with history of such disorders with previous estrogen use (except when used in treatment of breast or prostatic malignancy)
Pregnancy
X - Contraindicated; benefit does not outweigh risk
Precautions
May cause some degree of fluid retention and require careful observation; certain patients may develop undesirable manifestations of excessive estrogenic stimulation
Ethinyl estradiol (Estinyl)
Bioequivalence of various estrogens is quite unclear, but 5-10 mcg of ethinyl estradiol equals approximately 300 mcg of conjugated estrogens in terms of quantifiable metabolic effects on sex hormone binding globulin and gonadotropins.
Adult
20 mcg PO qd
Pediatric
20 mcg PO qod
May reduce hypoprothrombinemic effect of anticoagulants; coadministration of barbiturates, rifampin, and other agents that induce hepatic microsomal enzymes may reduce estrogen levels; increased pharmacologic and toxicologic effects of corticosteroids may occur via inactivation of hepatic P450 enzyme; loss of seizure control has been observed when administered concurrently with hydantoins
Documented hypersensitivity; avoid in patients diagnosed with breast cancer, undiagnosed abnormal genital bleeding, active thrombophlebitis or thromboembolic disorders, or in patients with history of such disorders with previous estrogen use (except when used in treatment of breast or prostatic malignancy)
Pregnancy
X - Contraindicated; benefit does not outweigh risk
Precautions
May cause some degree of fluid retention and require careful observation; certain patients may develop undesirable manifestations of excessive estrogenic stimulation
More on Androgen Insensitivity Syndrome |
| Overview: Androgen Insensitivity Syndrome |
| Differential Diagnoses & Workup: Androgen Insensitivity Syndrome |
Treatment & Medication: Androgen Insensitivity Syndrome |
| Follow-up: Androgen Insensitivity Syndrome |
| Multimedia: Androgen Insensitivity Syndrome |
| References |
| Further Reading |
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Further Reading
- Relevant clinical guidelines include the following:
- Related eMedicine topics include the following:
- Amenorrhea (Pediatrics: Surgery)
- Childhood Cancer, Epidemiology
- Sexuality, Gender Identity
Keywords
androgen insensitivity syndrome, AIS, complete androgen insensitivity syndrome, CAIS, partial androgen insensitivity syndrome, PAIS, testicular feminization, androgen receptor deficiency, androgen resistance syndrome, feminizing testes syndrome, Reifenstein syndrome, Morris syndrome, Goldberg-Maxwell syndrome, hypospadias, clitorimegaly, diminished penile size, gonadoblastoma, hernias, acne, clitoral enlargement, masculinization, treatment, diagnosis
Treatment & Medication: Androgen Insensitivity Syndrome