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Hypofractionated accelerated radiotherapy (HART) with concurrent and adjuvant temozolomide in newly diagnosed glioblastoma: a phase II randomized trial (HART-GBM trial)

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Abstract

Introduction

Maximal safe surgical resection followed by adjuvant chemoradiation has been standard for newly diagnosed glioblastoma multiforme (GBM). Hypofractionated accelerated radiotherapy (HART) has the potential to improve outcome as it reduces the overall treatment time and increases the biological effective dose.

Methods

Between October 2011 and July 2017, a total of 89 newly diagnosed GBM patients were randomized to conventional fractionated radiotherapy (CRT) or HART. Radiotherapy was delivered in all patients with a three-dimensional conformal radiotherapy technique in CRT arm (60 Gy in 30 fractions over 6 weeks @ 2 Gy/per fraction) or simultaneous integrated boost intensity modulated radiotherapy in HART arm (60 Gy in 20 fractions over 4 weeks @ 3 Gy/per fraction to high-risk planning target volume (PTV) and 50 Gy in 20 fractions over 4 weeks @ 2.5 Gy/per fraction to low-risk PTV). The primary endpoint of the trial was overall survival (OS).

Results

After a median follow-up of 11.4 months (Range: 2.9–42.5 months), 26 patients died and 39 patients had progression of the disease. Median OS for the entire cohort was 23.4 months. Median OS in the CRT and HART arms were 18.07 months (95% CI 14.52-NR) and 25.18 months (95% CI 12.89-NR) respectively, p = 0.3. Median progression free survival (PFS) for the entire cohort was 13.5 months (Range: 11.7–15.7 months). In multivariate analysis patients younger than 40 years of age, patients with a gross total resection of tumor and a mutated IDH-1 had significantly better OS. PFS was significantly better for patients with a gross total resection of tumor and a mutated IDH-1. All patients included in the trial completed the planned course of radiation. Only two patients required hospital admission for features of raised intracranial tension. One patient in the HART arm required treatment interruption.

Conclusion

HART is comparable to CRT in terms of survival outcome. HART arm had no excess treatment interruption and minimal toxicity. Dose escalation, reduction in overall treatment time, is the advantages with use of HART.

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Authors and Affiliations

  1. Department of Radiation Oncology, All India Institute of Medical Sciences, New Delhi, India

    Supriya Mallick, Haresh Kunhiparambath, Subhash Gupta, Rony Benson, Seema Sharma, M. A. Laviraj, Pramod Kumar Julka, Dayanand Sharma & Goura Kishor Rath

  2. Department of Bio-Statistics, All India Institute of Medical Sciences, New Delhi, India

    Ashish Datt Upadhyay

Authors
  1. Supriya Mallick
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  2. Haresh Kunhiparambath
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  3. Subhash Gupta
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Correspondence to Supriya Mallick.

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Mallick, S., Kunhiparambath, H., Gupta, S. et al. Hypofractionated accelerated radiotherapy (HART) with concurrent and adjuvant temozolomide in newly diagnosed glioblastoma: a phase II randomized trial (HART-GBM trial). J Neurooncol 140, 75–82 (2018). https://doi.org/10.1007/s11060-018-2932-3

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  • DOI: https://doi.org/10.1007/s11060-018-2932-3

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