Abstract
Purpose
Dose escalations above 60 Gy based on MRI have not led to prognostic benefits in glioblastoma patients yet. With positron emission tomography (PET) using [18F]fluorethyl-L-tyrosine (FET), tumor coverage can be optimized with the option of regional dose escalation in the area of viable tumor tissue.
Methods and materials
In a prospective phase II study (January 2008 to December 2009), 22 patients (median age 55 years) received radiochemotherapy after surgery. The radiotherapy was performed as an MRI and FET-PET-based integrated-boost intensity-modulated radiotherapy (IMRT). The prescribed dose was 72 and 60 Gy (single dose 2.4 and 2.0 Gy, respectively) for the FET-PET- and MR-based PTV-FET(72 Gy) and PTV-MR(60 Gy). FET-PET and MRI were performed routinely for follow-up. Quality of life and cognitive aspects were recorded by the EORTC-QLQ-C30/QLQ Brain20 and Mini-Mental Status Examination (MMSE), while the therapy-related toxicity was recorded using the CTC3.0 and RTOG scores.
Results
Median overall survival (OS) and disease-free survival (DFS) were 14.8 and 7.8 months, respectively. All local relapses were detected at least partly within the 95% dose volume of PTV-MR(60 Gy). No relevant radiotherapy-related side effects were observed (excepted alopecia). In 2 patients, a pseudoprogression was observed in the MRI. Tumor progression could be excluded by FET-PET and was confirmed in further MRI and FET-PET imaging. No significant changes were observed in MMSE scores and in the EORTC QLQ-C30/QLQ-Brain20 questionnaires.
Conclusion
Our dose escalation concept with a total dose of 72 Gy, based on FET-PET, did not lead to a survival benefit. Acute and late toxicity were not increased, compared with historical controls and published dose–escalation studies.
Zusammenfassung
Ziel
Steigerungen der Strahlendosis über 60 Gy, basierend auf der MRT, führten bisher nicht zu einer Prognoseverbesserung bei Glioblastomen. Die [18F]Fluorethyl-L-Tyrosin (FET)-PET erlaubt eine optimierte Erfassung der Tumorausdehnung, womit die Option einer fokussierten Dosiserhöhung im Bereich viabler Tumorareale verbunden ist.
Material und Methoden
In einer prospektiven Phase-II-Studie (2008–2009) erhielten 22 Glioblastom-Patienten eine Strahlenchemotherapie nach erfolgter Resektion. Die Bestrahlung erfolgte als Integrated-Boost-IMRT (IB-IMRT), basierend auf MRT- und postoperativer FET-PET-Bildgebung. Die Dosisverschreibung betrug 72 bzw. 60 Gy (ED 2,4 bzw. 2,0 Gy) für das FET-PET- bzw. MRT-basierte PTV-FET(72 Gy) bzw. PTV-MRT(60 Gy). Das Follow-Up basierte auf regelmäßigen FET-PET- sowie MRT-Untersuchungen. Lebensqualität und kognitive Aspekte wurden mittels EORTC-QLQ-C30 und QLQ-Brain20 sowie „Mini Mental Status“-Test (MMST) erfasst. Die Toxizitätserfassung erfolgte mittels CTC3.0- bzw. RTOG-Score.
Ergebnisse
Gesamt- und rezidivfreies Überleben lagen bei 14,8 und 7,8 Monaten. Alle lokalen Rezidive lagen zumindest partiell innerhalb der 95%-Isodose des PTV-MRT(60 Gy). Höhergradige strahlentherapiespezifische Nebenwirkungen traten nicht auf. Bei 2 Patienten zeigte sich eine Pseudoprogression im MRT. Ein Tumorprogress wurde mittels FET-PET ausgeschlossen und durch weitere Bildgebung bestätigt.
Hinsichtlich der Lebensqualität und Kognition zeigten sich im zeitlichen Verlauf keine signifikanten Veränderungen.
Schlussfolgerung
Unser Dosiseskalationskonzept mit bis zu 72 Gy, basierend auf der FET-PET, führte nicht zu einer Überlebensverbesserung. Eine Erhöhung der Toxizität oder eine signifikante Verschlechterung der Lebensqualität zeigte sich im Vergleich zur historischen Kontrolle nicht.
References
Balducci M, Apicella G, Manfrida S et al (2010) Single-arm phase II study of conformal radiation therapy and temozolomide plus fractionated stereotactic conformal boost in high-grade gliomas: final report. Strahlenther Onkol 186:558–564
Baumert BG, Lutterbach J, Bernays R et al (2003) Fractionated stereotactic radiotherapy boost after post-operative radiotherapy in patients with high-grade gliomas. Radiother Oncol 67:183–190
Blonigen BJ, Steinmetz RD, Levin L et al (2010) Irradiated volume as a predictor of brain radionecrosis after linear accelerator stereotactic radiosurgery. Int J Radiat Oncol Biol Phys 77:996–1001
Cardinale R, Won M, Choucair A et al (2006) A phase II trial of accelerated radiotherapy using weekly stereotactic conformal boost for supratentorial glioblastoma multiforme: RTOG 0023. Int J Radiat Oncol Biol Phys 65:1422–1428
Chan JL, Lee SW, Fraass BA et al (2002) Survival and failure patterns of high-grade gliomas after three-dimensional conformal radiotherapy. J Clin Oncol 20:1635–1642
Fowler JF (1989) The linear-quadratic formula and progress in fractionated radiotherapy. Br J Radiol 62:679–694
Gerstein J, Franz K, Steinbach JP et al (2011) Radiochemotherapy with temozolomide for patients with glioblastoma: prognostic factors and long-term outcome of unselected patients from a single institution. Strahlenther Onkol 187:722–728
Grosu AL, Weber WA, Franz M et al (2005) Reirradiation of recurrent high-grade gliomas using amino acid PET (SPECT)/CT/MRI image fusion to determine gross tumor volume for stereotactic fractionated radiotherapy. Int J Radiat Oncol Biol Phys 63:511–519
Guckenberger M, Mayer M, Buttmann M et al (2011) Prolonged survival when temozolomide is added to accelerated radiotherapy for glioblastoma multiforme. Strahlenther Onkol 187:548–554
Hamacher K, Coenen HH (2002) Efficient routine production of the 18F-labelled amino acid O-2–18F fluoroethyl-L-tyrosine. Appl Radiat Isot 57:853–856
Langen KJ, Hamacher K, Weckesser M et al (2006) O-(2-[18F]fluoroethyl)-L-tyrosine: uptake mechanisms and clinical applications. Nucl Med Biol 33:287–294
Lee SW, Fraass BA, Marsh LH et al (1999) Patterns of failure following high-dose 3-D conformal radiotherapy for high-grade astrocytomas: a quantitative dosimetric study. Int J Radiat Oncol Biol Phys 43:79–88
Macdonald DR, Cascino TL, Schold SC Jr et al (1990) Response criteria for phase II studies of supratentorial malignant glioma. J Clin Oncol 8:1277–1280
Milano MT, Okunieff P, Donatello RS et al (2010) Patterns and timing of recurrence after temozolomide-based chemoradiation for glioblastoma. Int J Radiat Oncol Biol Phys 78:1147–1155
Oppitz U, Maessen D, Zunterer H et al (1999) 3D-recurrence-patterns of glioblastomas after CT-planned postoperative irradiation. Radiother Oncol 53:53–57
Pauleit D, Floeth F, Hamacher K et al (2005) O-(2-[18F]fluoroethyl)-L-tyrosine PET combined with MRI improves the diagnostic assessment of cerebral gliomas. Brain 128:678–687
Piroth MD, Pinkawa M, Holy R et al (2009) Integrated-boost IMRT or 3-D-CRT using FET-PET based auto-contoured target volume delineation for glioblastoma multiforme – a dosimetric comparison. Radiat Oncol 4:57
Piroth MD, Pinkawa M, Holy R et al (2011) Prognostic value of early 18F-fluoroethylthyrosine PET after radiochemotherapy in glioblastoma multiforme. Int J Radiat Oncol Biol Phys 80:176–184
Piroth MD, Holy R, Pinkawa M et al (2011) Prognostic impact of postoperative, pre-irradiation 18F-fluoroethyl-L-tyrosine uptake in glioblastoma patients treated with radiochemotherapy. Radiother Oncol 99:218–224
Rickhey M, Koelbl O, Eilles C et al (2008) A biologically adapted dose-escalation approach, demonstrated for 18F-FET-PET in brain tumors. Strahlenther Onkol 184:536–542
Rickhey M, Moravek Z, Eilles C et al (2010) 18F-FET-PET-based dose painting by numbers with protons. Strahlenther Onkol 186:320–326
Roesch P, Netsch T, McNutt T et al (2003) Syntegra – automated image registration algorithms. Philips White Paper
Shrieve DC, Alexander E III, Black PM et al (1999) Treatment of patients with primary glioblastoma multiforme with standard postoperative radiotherapy and radiosurgical boost: prognostic factors and long-term outcome. J Neurosurg 90:72–77
Souhami L, Seiferheld W, Brachman D et al (2004) Randomized comparison of stereotactic radiosurgery followed by conventional radiotherapy with carmustine to conventional radiotherapy with carmustine for patients with glioblastoma multiforme: report of Radiation Therapy Oncology Group 93-05 protocol. Int J Radiat Oncol Biol Phys 60:853–860
Stupp R, Mason WP, Bent MJ van den et al (2005) Radiotherapy plus concomitant and adjuvant temozolomide for glioblastoma. N Engl J Med 352:987–996
Stupp R, Hegi ME, Mason WP et al (2009) Effects of radiotherapy with concomitant and adjuvant temozolomide versus radiotherapy alone on survival in glioblastoma in a randomised phase III study: 5-year analysis of the EORTC-NCIC trial. Lancet Oncol 10:459–466
Tsien C, Moughan J, Michalski JM et al (2009) Phase I three-dimensional conformal radiation dose escalation study in newly diagnosed glioblastoma: radiation therapy oncology group trial 98-03. Int J Radiat Oncol Biol Phys 73:699–708
Walker MD, Strike TA, Sheline GE (1979) Analysis of dose-effect relationship in the radiotherapy of malignant gliomas. Int J Radiat Oncol Biol Phys 5:1725–1731
Walker MD, Alexander E Jr, Hunt WE et al (1978) Evaluation of BCNU and/or radiotherapy in the treatment of anaplastic gliomas. A cooperative clinical trial. J Neurosurg 49:333–343
Weber DC, Casanova N, Zilli T et al (2009) Recurrence pattern after [(18)F]fluoroethyltyrosine-positron emission tomography-guided radiotherapy for high-grade glioma: a prospective study. Radiother Oncol 93:586–592
Wen PY, Macdonald DR, Reardon DA et al (2010) Updated response assessment criteria for high-grade gliomas: response assessment in neuro-oncology working group. J Clin Oncol 28:1963–1972
Wick A, Felsberg J, Steinbach JP et al (2007) Efficacy and tolerability of temozolomide in an alternating weekly regimen in patients with recurrent glioma. J Clin Oncol 25:3357–3361
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Piroth, M., Pinkawa, M., Holy, R. et al. Integrated boost IMRT with FET-PET-adapted local dose escalation in glioblastomas. Strahlenther Onkol 188, 334–339 (2012). https://doi.org/10.1007/s00066-011-0060-5
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DOI: https://doi.org/10.1007/s00066-011-0060-5