Bone mineral density after allogeneic bone marrow transplantation

Bone turnover markers and bone mineral density (BMD) were studied in 25 adu lt patients (14 females, 11 males) who had undergone allogeneic bone marrow transplantation (BMT), The interval from BMT to the first examination was at least I year (mean 3, range 1-10), Mean age of the patients at the time of first evaluation was 42 (range 19-54) years. Blood samples and urine col lections for evaluation of biochemical factors reflecting skeletal turnover were performed together with the first BMD measurement. BMD was measured f rom the lumbar vertebrae (L2 to L4) with computed tomography and results we re expressed as Z-scores, At the time of the first measurement five patient s (20%) had Z-scores <-2.5 s.d. and 12 patients (48%) between -1 and -2.5 s .d. In 12 patients EMD assessments were repeated and it seemed that reducti on in BMD had mostly occurred during and shortly after BMT and remained the same during follow-up. The cross-linked carboxyterminal telopeptide of typ e I collagen (ICTP) correlated negatively with BMD (r = -0.45, P = 0.045) a s did bone-specific alkaline phosphatase (BAP; r = -0.64, P = 0.002), No co rrelation between BMD and time interval from diagnosis to BMT, conditioning regimen, corticosteroid use or hospital stay during transplantation was fo und. In conclusion, bone disease is common after BMT, Our findings demonstr ate an increased collagen and bone turnover and a high risk of osteoporosis . BMD measurements must be repeated regularly and collagen markers such as ICTP and BAP can be beneficial in estimating the activity of bone disease.