Association Between the Volume Transfer Constant (K trans ) From Dynamic Contrast-Enhanced Perfusion MR and…

Cohort studyCancer reports (Hoboken, N.J.)· Oct 2025

Association Between the Volume Transfer Constant (K trans ) From Dynamic Contrast-Enhanced Perfusion MR and HER2 Status in Breast Cancer Brain Metastases.

Jonathan R Young, Luke N Ledbetter, Julie A Ressler … Bihong T Chen

Breast & Gynecologic PathologyCohort studyDiagnosisQ3IF 2.5

Higher Ktrans on perfusion MR is linked to HER2-positive breast cancer brain metastases

Association Between the Volume Transfer Constant (K trans ) From Dynamic Contrast-Enhanced Perfusion MR and HER2 Status in Breast Cancer Brain Metastases.

Jonathan R Young … Bihong T Chen

Cancer reports (Hoboken, N.J.) · Oct 2025

Background

With the development of new human epidermal growth factor 2 (HER2)-targeting therapies, a non-invasive method of determining the HER2 status of breast cancer brain metastases can be of great clinical value, particularly given the risks of brain biopsy and the possibility of discordance between HER2 status of the primary breast cancer and the brain metastasis.

Purpose

The purpose of this study was to assess whether the volume transfer constant (Ktrans) from dynamic contrast-enhanced (dynamic contrast-enhanced) perfusion brain MR could assist in identifying the HER2 status of breast cancer brain metastases.

Methods

With IRB approval for this retrospective study, we searched the electronic medical record at the City of Hope Comprehensive Cancer Center to identify all histopathologically proven breast cancer brain metastases with both preoperative dynamic contrast-enhanced perfusion brain MR and HER2 assessment of the resected/biopsied brain specimens at the City of Hope Comprehensive Cancer Center from 2011-2022.

n = 9 women

Results

HER2-positive tumors leak contrast faster, a sign of higher blood vessel permeability

HER2-positive

0.09min-1

HER2-negative

0.02min-1

More results

There were 9 women in our study cohort with a mean age of 55 years.

Our cohort was comprised of a total of 9 breast cancer brain metastases, 3 of which were HER2-positive, 6 of which were HER2-negative.

“

Conclusion

Ktrans may help to differentiate HER2-positive from HER2-negative breast cancer brain metastases, if validated in a large prospective, multi-center trial.

Association Between the Volume Transfer Constant (K trans ) From Dynamic Contrast-Enhanced Perfusion MR and HER2 Status in Breast Cancer Brain Metastases.

Association Between the Volume Transfer Constant (K trans ) From Dynamic Contrast-Enhanced Perfusion MR and HER2 Status in Breast Cancer Brain Metastases.

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