Abstract
Purpose
18F-fluorodeoxyglucose (FDG) uptake on positron emission tomography (PET) is related to the biological parameters and prognosis of breast cancer. However, whether whole-body PET (WBPET) and dedicated breast PET (DbPET) can reflect the tumor microenvironment is unclear. This study investigated the relationship between stromal tumor-infiltrating lymphocytes (TILs) and maximum standardized uptake value (SUVmax) in WBPET and DbPET.
Methods
A total of 125 invasive breast cancers underwent WBPET and ring-type DbPET and resected specimens were pathologically assessed. The impact of SUVmax on the tumor biological parameters and TILs was retrospectively evaluated. SUVmax was classified as high and low relative to the median values (WBPET-SUVmax: 2.2 and DbPET-SUVmax: 6.0).
Results
SUVmax correlated with tumor size, nuclear grade, Ki-67 labeling index, and TILs in both WBPET and DbPET (all p < 0.001). In multiple linear regression analysis, tumor size, Ki-67 labeling index, and TILs predicted SUVmax in WBPET and DbPET. The cutoff values of tumor size, Ki-67 labeling index, and TILs predicting high SUVmax were 20 mm, 20%, and 20%, respectively. In multivariate analysis, the predictive factors for high SUVmax were tumor size and Ki-67 labeling index for WBPET and tumor size and TILs for DbPET. High SUVmax in DbPET was related to high numbers of TILs after propensity score matching analysis; however, WBPET was not (p = 0.007 and p = 0.624, respectively).
Conclusions
Both SUVmax values in WBPET and DbPET predicted TIL concentration of the primary breast cancer. In DbPET, SUVmax represented the immune microenvironment after adjusting for tumor biological factors.
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Abbreviations
- CTLA-4:
-
Cytotoxic T-lymphocyte-associated protein 4
- DbPET:
-
Dedicated breast positron emission tomography
- ER:
-
Estrogen receptor
- FDG:
-
18F-fluorodeoxyglucose
- FOV:
-
Field of view
- FOXP3:
-
Forkhead box P3
- HER2:
-
Human epidermal growth factor receptor 2
- IC-NST:
-
Invasive carcinoma of no special type
- OR:
-
Odds ratio
- PD-1:
-
Programmed cell death-1
- PET:
-
Positron emission tomography
- SUVmax:
-
Maximum standardized uptake value
- TIL:
-
Tumor-infiltrating lymphocytes
- TNBC:
-
Triple-negative breast cancer
- WBPET:
-
Whole-body positron emission tomography
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Acknowledgements
We thank Kazushi Marukawa and Masatsugu Tsujimura of Chuden Hospital for providing PET examination data.
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Sasada, S., Shiroma, N., Goda, N. et al. The relationship between ring-type dedicated breast PET and immune microenvironment in early breast cancer. Breast Cancer Res Treat 177, 651–657 (2019). https://doi.org/10.1007/s10549-019-05339-0
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DOI: https://doi.org/10.1007/s10549-019-05339-0