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Changes in prostate apparent diffusion coefficient values during radiotherapy after neoadjuvant hormones.

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Summary
This summary is machine-generated.

Neoadjuvant hormone therapy (NA-HT) may affect apparent diffusion coefficient (ADC) measurements in prostate cancer patients undergoing radiotherapy. Changes in ADC values during external beam radiotherapy (EBRT) were not significant, suggesting limited predictive utility.

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Area of Science:

  • Radiology
  • Oncology
  • Medical Imaging

Background:

  • Diffusion-weighted magnetic resonance imaging (MRI) measures apparent diffusion coefficient (ADC) to assess prostate cancer radiotherapy response noninvasively.
  • Neoadjuvant hormone therapy (NA-HT) may attenuate the effectiveness of ADC as a response biomarker.
  • This study investigates ADC values in prostate cancer patients before, during, and after external beam radiotherapy (EBRT) following NA-HT.

Purpose of the Study:

  • To evaluate changes in prostate tumor and normal tissue ADC values during and after EBRT in patients pretreated with NA-HT.
  • To determine the utility of ADC changes as a predictive tool for radiotherapy response in this patient cohort.

Main Methods:

  • Prospective study of 15 prostate cancer patients (T2c) receiving 3 months of NA-HT followed by EBRT.
  • ADC-MRI scans were performed before EBRT, at week 3 of EBRT, and 8 weeks post-EBRT.
  • Median ADC was calculated for tumor, peripheral zone (PZ), and central zone (CZ) at each time point.

Main Results:

  • No significant differences were observed in median tumor ADC values before, during, or after EBRT (p > 0.05).
  • Tumor ADC values did not significantly differ from PZ or CZ ADC values at any time point.
  • Gleason score did not correlate with ADC values.

Conclusions:

  • Prior NA-HT appears to attenuate differences in ADC parameters between normal and malignant prostate tissue during EBRT.
  • The predictive value of ADC changes for radiotherapy response may be limited in prostate cancer patients who have received NA-HT.