Abstract:
:Cytoplasmic islet cell antibody-negative (ICA-; less than 20 Juvenile Diabetes Foundation units, n = 1670) and ICA+ (n = 42) first-degree relatives of type I (insulin-dependent) diabetic individuals were studied for competitive insulin autoantibodies (CIAAs) with a radioassay. Overall, 3.7% of first-degree relatives (64 of 1712) were CIAA+. Of ICA- relatives, 2.7% (45 of 1670) exceeded the upper limit of our normal CIAA range (greater than 39 nU/ml), and 45% (19 of 42) of ICA+ relatives exceeded this normal range. Follow-up serums for repeat CIAA determination have been obtained from 16 of the nondiabetic CIAA+/ICA- individuals (time between samples, 0.4-5.8 yr). Fourteen of these 16 (87%) CIAA+/ICA- relatives were found to still be positive on follow-up, and 2 of the relatives who were positive on the first determination were negative on their follow-up test. With a mean follow-up of approximately 2 yr, 4 of 45 (9%) of the CIAA+/ICA- relatives, 5 of 23 (22%) of the ICA+/CIAA- relatives, and 12 of 19 (63%) of the CIAA+/ICA+ relatives developed diabetes. Life-table analysis indicated that, overall, 53% of CIAA+ relatives become diabetic after 5 yr of follow-up versus 65% of ICA+ relatives. Also by life-table analysis, the predicted risk after 5 yr of follow-up for progression to diabetes is 17% for CIAA+/ICA- relatives, 42% for ICA+/CIAA- relatives, and 77% for CIAA+/ICA+ relatives. The highest rate of progression to diabetes was found in ICA+ relatives with CIAA levels greater than 150 nU/ml (100% projected to be diabetic within 5 yr, P less than .008 vs. ICA+/CIAA- relatives).
journal_name
Diabetesjournal_title
Diabetesauthors
Ziegler AG,Ziegler R,Vardi P,Jackson RA,Soeldner JS,Eisenbarth GSdoi
10.2337/diab.38.10.1320subject
Has Abstractpub_date
1989-10-01 00:00:00pages
1320-5issue
10eissn
0012-1797issn
1939-327Xjournal_volume
38pub_type
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