Abnormalities in Thyroid Function in Relatives of Patients with Graves' Disease and Hashimoto's Thyroiditis: Lack of Correlation with Inheritance of HLA-B8
INDER J. CHOPRA,
DAVID H. SOLOMON,
USHA CHOPRA,
EMI YOSHIHARA,
PAUL I. TERASAKI and
FRANCOISE SMITH
Departments of Medicine and Surgery, UCLA Center for the Health Sciences, Los Angeles California 90024
Thyroid function, antithyroid antibodies and human major histocompatibilitylocus (HLA) antigens were studied in first-degree relatives(parents, siblings and children) of patients with Graves' diseaseand Hashimoto's thyroiditis. The particularly common abnormalitiesin Graves' relatives were positive antithyroid antibodies (25of 74 cases, 34%) and supranormal thyrotropin (TSH) responseto thyrotropin-releasing hormone (TRH) (12 of 44 cases, 27%).Less common abnormalities were goiter (10 of 92 cases, 11%),ophthalmopathy (1 of 92 cases, 1.1%), non-suppressibility of24 h thyroid radioiodine uptake (2 of 48 cases, 4.2%), elevatedbaseline serum TSH (4 of 80 cases, 5.0%), subnormal TSH responseto TRH (2 of 44 cases, 4.5%) and detectable LATS-protector (3of 47 cases, 6.4%). Thyroid uptake was non-suppressible in twoof the three cases with LATS-protector; the remaining one hadophthalmopathy and normally suppressible thyroid uptake. Ofthe 14 relatives of patients with Hashimoto's thyroiditis includedin the study, three were hypothyroid with antithyroid antibodiesand goiter. The thyroid-related abnormalities, similar to thosenoted above for Graves' relatives, occurred frequently in theremaining euthyroid cases. Although frequency of HLA-B8 in 73patients with Graves' disease was significantly higher thanin control subjects (37% vs. 21%, P < 0.05), no significantabnormality was detected in HLA patterns of relatives of patientswith Graves' disease. Furthermore, the incidence of thyroid-relatedabnormalities (vide supra) in Graves' relatives with HLA-B8did not differ significantly from that in relatives withoutHLA-B8. HLA patterns of patients with Hashimoto's thyroiditiswere normal except for increased uncorrected frequency of B8(42%, P < 0.01); this was not significantly different fromnormal when the probability was corrected for the number ofantigens studied (P = 0.24, N = 31). Conclusions: 1) thyroidfunctional abnormalities occur very frequently in relativesof patients with Graves' disease and Hashimoto's thyroiditis;2) since thyroid functional abnormalities occur so often evenwhen HLApatterns are normal, mechanism(s) responsible for abnormalitiesmust include factor(s) other than inheritance of B8 or otherHLA antigens.
Received September 22, 1976.
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