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Stereotactic Body Radiotherapy (SBRT) to Localised Prostate Cancer in the Era of MRI-Guided Adaptive Radiotherapy: Doses Delivered in the HERMES Trial Comparing Two- and Five-Fraction Treatments. | LitMetric

AI Article Synopsis

  • The HERMES trial examines the effectiveness of MRI-guided daily-adaptive radiotherapy for men with localized prostate cancer, comparing a 2-fraction approach with a boost to the tumor against a standard 5-fraction treatment.
  • Analysis of the first ten patients revealed that while target coverage was high, certain constraints related to rectal dose were occasionally exceeded, especially influenced by the volume of gas in the rectum during treatment.
  • The results indicate that while the planned dose delivery is generally feasible, actual doses to both cancerous targets and surrounding organs at risk may show variability, necessitating careful monitoring.

Article Abstract

HERMES is a phase II trial of MRI-guided daily-adaptive radiotherapy (MRIgART) randomising men with localised prostate cancer to either 2-fractions of SBRT with a boost to the tumour or 5-fraction SBRT. In the context of this highly innovative regime the dose delivered must be carefully considered. The first ten patients recruited to HERMES were analysed in order to establish the dose received by the targets and organs at risk (OARS) in the context of intrafraction motion. A regression analysis was performed to measure how the volume of air within the rectum might further impact rectal dose secondary to the electron return effect (ERE). One hundred percent of CTV target objectives were achieved on the MRI taken prior to beam-on-time. The post-delivery MRI showed that high-dose CTV coverage was achieved in 90% of sub-fractions (each fraction is delivered in two sub-fractions) in the 2-fraction cohort and in 88% of fractions the 5-fraction cohort. Rectal D1 cm was the most exceeded constraint; three patients exceeded the D1 cm < 20.8 Gy in the 2-fraction cohort and one patient exceeded the D1 cm < 36 Gy in the 5-fraction cohort. The volume of rectal gas within 1 cm of the prostate was directly proportional to the increase in rectal D1 cm, with a strong (R = 0.69) and very strong (R = 0.90) correlation in the 2-fraction and 5-fraction cohort respectively. Dose delivery specified in HERMES is feasible, although for some patients delivered doses to both target and OARs may vary from those planned.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11171331PMC
http://dx.doi.org/10.3390/cancers16112073DOI Listing

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