RT Journal Article SR Electronic T1 Recovery from secondary adrenal insufficiency in a patient with immune checkpoint inhibitor therapy induced hypophysitis JF Journal for ImmunoTherapy of Cancer JO J Immunother Cancer FD BMJ Publishing Group Ltd SP 248 DO 10.1186/s40425-019-0729-3 VO 7 IS 1 A1 Sahityasri Thapi A1 Amanda Leiter A1 Matthew Galsky A1 Emily J. Gallagher YR 2019 UL http://jitc.bmj.com/content/7/1/248.abstract AB Background Hypophysitis is a well-recognized immune-related adverse event in patients treated with immune checkpoint inhibitors for cancer. Some anterior pituitary hormones may recover; however, secondary adrenal insufficiency is usually permanent.Case presentation A 26-year old male with metastatic clear cell renal cell carcinoma was started on treatment with the anti-programmed cell death-1 monoclonal antibody (anti-PD-1 mAb) nivolumab, followed by combined nivolumab and the anti-cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) mAb, ipilimumab. After starting nivolumab monotherapy the patient developed thyroiditis, which resolved without treatment. Prior to commencing combined ICI therapy, a random serum cortisol drawn at 1:30 pm and was 15.0 μg/dL (414 nmol/L). Three weeks after starting combined ICI therapy he developed sudden onset of severe fatigue and 1 pm serum cortisol was 2.0 μg/dL (55.2 nmol/L), adrenocorticotropic hormone (ACTH) was 16 pg/mL (3.52 pmol/L). A diagnosis of hypophysitis was made, and he was immediately started on prednisone 1 mg/kg. His symptoms resolved rapidly, and he continued immune checkpoint inhibitor therapy. He was noted to also have low gonadotropic hormones and testosterone (nadir testosterone 81.19 ng/dL). The prednisone was tapered slowly over the next six weeks to a maintenance dose of 5 mg daily. Four months after the initial presentation his cortisol remained low, but his testosterone level had increased to 973.43 ng/dL. After five months his random serum cortisol (1 pm) increased to 11.0 μg/dL (303.6 nmol/L). The prednisone was cautiously discontinued with close monitoring. Two months off glucocorticoid replacement he remained asymptomatic with an ACTH of 24.1 pg/mL (5.3 pmol/L), and cortisol of 13.0 μg/dL (358.8 nmol/L).Conclusions This case documents the unusual recovery from secondary adrenal insufficiency in a patient who developed hypophysitis from immune checkpoint inhibitor therapy. Repeated pituitary hormone testing every three months for the first year after the development of hypophysitis may identify more patients with hypothalamic-pituitary-adrenal axis recovery.Abbreviations:ACTHAdrenocorticotropic hormoneCCRCCClear cell renal cell carcinomaCTLA-4Cytotoxic T-lymphocyte- associated protein 4FDG PET-CTFluorodeoxyglucose positron emission tomography computer tomographyFSHFollicle stimulating hormonefT4Free thyroxineHPAHypothalamic-pituitary-adrenalICIImmune checkpoint inhibitorIGF-1Insulin-like growth factor 1LHLuteinizing hormonemAbMonoclonal antibodyMVACMethotrexate, vinblastine, adriamycin, and cisplatinPDL-1Programmed death ligand 1TSHThyroid stimulating hormone