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Statistical Significance01:50

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Once data is collected from both the experimental and the control groups, a statistical analysis is conducted to find out if there are meaningful differences between the two groups. A statistical analysis determines how likely any difference found is due to chance (and thus not meaningful). In psychology, group differences are considered meaningful, or significant, if the odds that these differences occurred by chance alone are 5 percent or less. Stated another way, if we repeated this...
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Treatment of Liver Metastases Using an Internal Target Volume Method for Stereotactic Body Radiotherapy
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Prognostic Significance of Tumor Location for Liver Cancer Radiotherapy.

A Rashid Dar1, Isabelle McKillop2, Jason Vickress3

  • 1Radiation Oncology, Schulich School of Medicine & Dentistry - Western University, London, CAN.

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|February 22, 2019
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Summary

Tumor location near the portal vein bifurcation impacts liver cancer survival. A distance greater than 2 cm from the planning target volume edge to the bifurcation (DEB) predicts better survival in hepatocellular carcinoma patients treated with radiotherapy.

Keywords:
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Area of Science:

  • Hepatobiliary cancers
  • Radiation oncology
  • Medical imaging

Background:

  • Liver cancer incidence is rising globally, with a poor prognosis.
  • Advances in treatment have improved outcomes, but prognostic factors require further investigation.
  • The impact of tumor location relative to the portal vein bifurcation on radiotherapy outcomes is not well-established.

Purpose of the Study:

  • To investigate the correlation between tumor location from the portal vein bifurcation and radiotherapy outcomes in hepatocellular carcinoma (HCC).
  • To identify geometric and dosimetric parameters predicting survival in liver cancer patients.

Main Methods:

  • Retrospective review of contrast-enhanced CT scans in 86 HCC patients.
  • Calculation of distance tumor bifurcation (DTB) and distance edge bifurcation (DEB).
  • Assessment of mean dose at bifurcation (MDB) and statistical analysis of predictive parameters.

Main Results:

  • Distance edge bifurcation (DEB) was a significant predictor of survival (P = 0.028).
  • A smaller DEB and DTB correlated with a larger mean dose at bifurcation (MDB).
  • DEB demonstrated superior predictive value for overall survival compared to DTB and MDB.

Conclusions:

  • Tumor proximity to the portal vein's blood supply is a critical survival factor.
  • Distance edge bifurcation (DEB) greater than 2 cm is a significant predictor of survival in HCC patients.
  • Incorporating geometric and dosimetric parameters can enhance treatment selection for liver cancer patients receiving radiotherapy.