title: Early injury to cortical and cancellous bone from induction chemotherapy for adolescents and young adults treated for acute lymphoblastic leukemia.
abstract: Diminished bone density and skeletal fractures are common morbidities during and following therapy for acute lymphoblastic leukemia (ALL). While cumulative doses of osteotoxic chemotherapy for ALL have been reported to adversely impact bone density, the timing of onset of this effect as well as other changes to bone structure is not well characterized. We therefore conducted a prospective cohort study in pre-adolescent and adolescent patients (10-21years) newly diagnosed with ALL (n=38) to explore leukemia-related changes to bone at diagnosis and the subsequent impact of the first phase of chemotherapy ("Induction"). Using quantitative computerized tomography (QCT), we found that pre-chemotherapy bone properties were similar to age- and sex-matched controls. Subsequently over the one month Induction period, however, cancellous volumetric bone mineral density (vBMD) decreased markedly (-26.8%, p<0.001) with sparing of cortical vBMD (tibia -0.0%, p=0.860, femur -0.7%, p=0.290). The tibia underwent significant cortical thinning (average cortical thickness-1.2%, p<0.001; cortical area-0.4%, p=0.014), while the femur was less affected. Areal BMD (aBMD) concurrently measured by dual-energy X-ray absorptiometry (DXA) underestimated changes from baseline as compared to vBMD. Biochemical evidence revealed prevalent Vitamin D insufficiency and a net resorptive state at start and end of Induction. Our findings demonstrate for the first time that significant alterations to cancellous and cortical bone develop during the first month of treatment, far earlier during ALL therapy than previously considered. Given that osteotoxic chemotherapy is integral to curative regimens for ALL, these results provide reason to re-evaluate traditional approaches toward chemotherapy-associated bone toxicity and highlight the urgent need for investigation into interventions to mitigate this common adverse effect.
authors: Children's Center for Cancer and Blood Disease, Children's Hospital Los Angeles, 4650 Sunset Blvd, Los Angeles, CA 90027, USA; Jonathan Jaques Children's Cancer Center, Miller Children's Hospital Long Beach, 2801 Atlantic Avenue, Long Beach, CA 90806, USA; University of Southern California, Los Angeles, CA 90089, USA. Electronic address: eorgel@chla.usc.edu.
authors: E
authors: E
authors: Orgel
authors: Children's Orthopaedic Center, Children's Hospital Los Angeles, 4650 Sunset Blvd, Los Angeles, CA 90027, USA.
authors: N M
authors: NM
authors: Mueske
authors: Children's Orthopaedic Center, Children's Hospital Los Angeles, 4650 Sunset Blvd, Los Angeles, CA 90027, USA; University of Southern California, Los Angeles, CA 90089, USA.
authors: T A L
authors: TA
authors: Wren
authors: Department of Radiology, Children's Hospital Los Angeles, 4650 Sunset Blvd, Los Angeles, CA 90027, USA; University of Southern California, Los Angeles, CA 90089, USA.
authors: V
authors: V
authors: Gilsanz
authors: Children's Center for Cancer and Blood Disease, Children's Hospital Los Angeles, 4650 Sunset Blvd, Los Angeles, CA 90027, USA; University of Southern California, Los Angeles, CA 90089, USA.
authors: A M
authors: AM
authors: Butturini
authors: Children's Center for Cancer and Blood Disease, Children's Hospital Los Angeles, 4650 Sunset Blvd, Los Angeles, CA 90027, USA; University of Southern California, Los Angeles, CA 90089, USA.
authors: D R
authors: DR
authors: Freyer
authors: Children's Center for Cancer and Blood Disease, Children's Hospital Los Angeles, 4650 Sunset Blvd, Los Angeles, CA 90027, USA; Center for Endocrinology, Children's Hospital Los Angeles, 4650 Sunset Blvd, Los Angeles, CA 90027, USA; University of Southern California, Los Angeles, CA 90089, USA.
authors: S D
authors: SD
authors: Mittelman
mesh_terms: D000293:Adolescent; D015415:Biomarkers / Q000378:metabolism; D015519:Bone Density; D000071556:Cancellous Bone / Q000000981:diagnostic imaging / Q000473:pathology* / Q000503:physiopathology; D016022:Case-Control Studies; D015331:Cohort Studies; D000071538:Cortical Bone / Q000000981:diagnostic imaging / Q000473:pathology* / Q000503:physiopathology; D005260:Female; D006801:Humans; D060828:Induction Chemotherapy / Q000009:adverse effects*; D008297:Male; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000188:drug therapy*; D013977:Tibia / Q000000981:diagnostic imaging / Q000378:metabolism / Q000473:pathology; D014057:Tomography, X-Ray Computed; D055815:Young Adult
chemical_list: D015415:Biomarkers
keywords: Acute lymphoblastic leukemia; Bone; Bone mineral density; Chemotherapy; DXA; QCT