MANY CHILDREN with cystic fibrosis show malnutrition of increasing severity as they grow older.1 As we had observed that the development of severe anorexia is frequently a terminal event in fibrocystic disease, we tried, as a last resort, "artificial" stimulation of appetite by an anabolic steroid in large dosages in a terminal case. The dramatic result prompted us to extend the observation to other advanced cases. This report deals with six patients treated with large dosages of anabolic steroid, estrogen, or progestational compounds.Report of Cases Case 1.\p=m-\Acase of cystic fibrosis was diagnosed for this girl at the age of 6 years when she had bilateral emphysema and perihilar infiltrations by chest x-ray, negative stool trypsin, and a sweat chloride of 71 mEq/liter. The course of her disease fluctuated with recurrent episodes of pneumonia, appetite failure, weight loss, inanition, and psychic depression. As may be seen from her growth grid (Fig 1), four major periods of weight plateau or serious loss were seen. These periods resulted in hospitalization for inten¬ sification of specific antibiotic therapy, aerosol mist, and postural drainage for treatment of pneumonia. In her ninth year of life, control of lung infection became increasingly difficult and inanition became extreme. She was hospitalized without apparent improvement in appetite and general health even though some control of lung infection was effected. At this time (age of 10 years) she appeared to be in the state of severe disease which has heralded the death of previous patients. Methandrostenolone (Dianabol) was started at the dosage of 10 mg/ day. Appetite increase occurred after two weeks and progressed to a voracious food intake. Within ZYi months she had gained 8 kg (17 lb 10 oz) and had grown 3 cm (1]4 inches).She continued to show accelerated weight gain, height increments, and good general health on methandrostenolone. The intermittent use of so¬ dium oxacillin administered orally and saline aero¬ sol were associated with clearing of rales and rhonchi from her chest. Her lips lost their cyanosis, and clubbing of the fingers decreased. Because of the appearance of moderate acne, pubic hair, mild clitoral hypertrophy, and some lowering of the voice, the dosage of methandrostenolone was de¬ creased to 5 mg per day. Weight gain slowed, linear growth continued, and her general health remained good over a period of four more months. Further lowering of dosage to 2.5 mg/day was followed by recurrence of signs and symptoms of lower respira¬ tory tract infection which resulted in rehospitalization. Marked appetite failure, weight loss, and depression recurred. More intensive treatment with specific antibiotics, mist, and postural drainage resulted again in some return of well being but appetite was sporadic and weight loss continued. Because methandrostenolone in dosage of 10 mg/day failed to have appreciable effect over a one-month period, estrogens were added to the regimen in the form of estradiol valerate (EV) (Delestrogen), 20 mg every t...