Evaluation of tumour necrosis during chemotherapy with diffusion-weighted MR imaging: preliminary results in osteosarcomas
Rent the article at a discountRent now
* Final gross prices may vary according to local VAT.Get Access
During successful chemotherapy of osteosarcomas tumour size does not diminish significantly because the therapy has limited impact on the mineralized matrix of the tumour. Treatment response is considered successful if, histologically, more than 90% of tumour cells show necrosis.
To determine if osteosarcomas change their water diffusion during preoperative chemotherapy in relation to the amount of tumour necrosis.
Materials and Methods
Eight patients (age 11–19 years) with histologically proven limb osteosarcoma underwent T1-weighted, fat-suppressed T2-weighted and contrast-enhanced T1-weighted spin-echo imaging together with diffusion-weighted EPI sequences (b = 700) at 1.5 T before and after five cycles of standard chemotherapy. Tumour volume and apparent diffusion coefficient (ADC) maps were calculated before and after chemotherapy. The degree of tumour necrosis after chemotherapy was assessed using the histological Salzer-Kuntschik classification (grades 1–6).
During chemotherapy, the ADC values of osteosarcomas changed significantly. The ADC of untreated tumour was 2.1 ± 0.4 × 10−3 mm2/s (mean ± SD) (95% CI 1.6–2.0). The ADC of chemotherapy-treated sarcomas was 2.5 ± 0.4 × 10−3 mm2/s (95% CI 1.8–2.2). Necrotic areas, which were confirmed by macroscopic examination, showed ADC values up to 2.7 × 10−3 mm2/s. Four patients with little viable tumour tissue within the neoplasm (Salzer-Kuntschik grades 1–2) had an increase in ADC of 0.4 up to 0.7 × 10−3 mm2/s. Four patients with larger areas of viable tumour (Salzer-Kuntschik grade 4) showed a lesser increase in ADC of 0.0 up to 0.3 × 10−3 mm2/s. The differences in ADC values in tumour tissue before and after chemotherapy were highly significant (P = 0.01).
During chemotherapy of osteosarcomas, tumour ADC changes are related to the degree of tumour necrosis.
- Hoffer, FA, Nikanorov, A, Reddick, WE (2000) Accuracy of MR imaging for detecting epiphyseal extension of osteosarcoma. Pediatr Radiol 30: pp. 289-298 CrossRef
- Lang, P, Johnston, JO, Arenal-Romero, F (1998) Advances in MR imaging of pediatric musculoskeletal neoplasms. Magn Reson Imaging Clin N Am 6: pp. 579-604
- Lang, P, Wendland, M, Saeed, M (1998) Osteogenic sarcoma: noninvasive in vivo assessment of tumor necrosis with diffusion weighted MR imaging. Radiology 206: pp. 227-235
- Ross, BD, Moffat, BA, Lawrence, TS (2003) Evaluation of cancer therapy using diffusion magnetic resonance imaging. Mol Cancer Ther 2: pp. 581-587
- Uhl, M, Saueressig, U, Kontny, U (2006) Osteosarcoma: preliminary results of in vivo assessment of tumour necrosis after chemotherapy with diffusion- and perfusion-weighted magnetic resonance imaging. Invest Radiol 41: pp. 618-623 CrossRef
- Baur, A, Reiser, MF (2000) Diffusion-weighted imaging of the musculoskeletal system in humans. Skeletal Radiol 29: pp. 555-562 CrossRef
- Parker, GJ (2004) Analysis of MR diffusion weighted images. Br J Radiol 77: pp. S176-S185 CrossRef
- Salzer-Kuntschik, M, Brand, G, Delling, G (1983) Determination of the degree of morphological regression following chemotherapy in malignant bone tumors. Pathologe 4: pp. 135-141
- Sanchez, RB, Quinn, SF, Walling, A (1990) Musculoskeletal neoplasms after intraarterial chemotherapy: correlation of MR images with pathologic specimens. Radiology 174: pp. 237-240
- Thoeny, HC, Keyzer, F, Vandecaveye, V (2005) Effect of vascular targeting agent in rat tumor model: dynamic contrast-enhanced versus diffusion-weighted MR imaging. Radiology 237: pp. 492-499 CrossRef
- Thoeny, HC, Keyzer, F, Chen, F (2005) Diffusion-weighted MR imaging in monitoring the effect of a vascular targeting agent on rhabdomyosarcoma in rats. Radiology 234: pp. 756-764 CrossRef
- Theilmann, RJ, Borders, R, Trouard, TP (2004) Changes in water mobility measured by diffusion MRI predict response of metastatic breast cancer to chemotherapy. Neoplasia 6: pp. 831-837 CrossRef
- Deng, J, Miller, FH, Rhee, TK (2006) Diffusion weighted MR imaging for determination of hepatocellular carcinoma response to yttrium-90 radioembolization. J Vasc Interv Radiol 17: pp. 1195-1200 CrossRef
- Evaluation of tumour necrosis during chemotherapy with diffusion-weighted MR imaging: preliminary results in osteosarcomas
Volume 36, Issue 12 , pp 1306-1311
- Cover Date
- Print ISSN
- Online ISSN
- Additional Links
- Diffusion-weighted MRI
- Industry Sectors
- Author Affiliations
- 1. Department of Radiology, University Hospital, Hugstetterstr 55, 79104, Freiburg, Germany
- 2. Department of Pathology, University Hospital, Freiburg, Germany
- 3. Children’s Hospital, University Hospital, Freiburg, Germany
- 4. Department of Paediatric Oncology, University Hospital, Freiburg, Germany
- 5. Department of Medical Physics, University Hospital, Freiburg, Germany