Abstract
Purpose
This study aimed to assess whether the whole body metabolic active tumour volume (MTVWB), quantified on staging [18F]FDG PET/CT, could further stratify stage IV non-small cell lung cancer (NSCLC) patients.
Methods
A group of 160 stage IV NSCLC patients, submitted to staging [18F]FDG PET/CT between July 2010 and May 2020, were retrospectively evaluated. MTVWB was quantified. Univariate and multivariate Cox regressions were carried out to assess correlation with overall survival (OS). C-statistic was used to test predictive power. Kaplan–Meier survival curves with Log-Rank tests were performed to compute statistical differences between strata from dichotomized variables and to calculate the estimated mean survival times (EMST). Survival rates at 1 and 5 years were calculated.
Results
MTVWB was a statistically significant predictor of OS on univariate (p < 0.0001) and multivariate analyses (p < 0.0001). The multivariate model with MTVWB (Cindex ± SE = 0.657 ± 0.024) worked significantly better as an OS predictor than the cTNM model (Cindex ± SE = 0.544 ± 0.028) (p = 0.003). An EMST of 29.207 ± 3.627(95% CI 22.099–36.316) months and an EMST of 10.904 ± 1.171(95% CI 8.609–13.199) months (Log-Rank p < 0.0001) were determined for patients with MTVWB < 104.3 and MTVWB ≥ 104.3, respectively. In subsamples of stage IVA (cut-off point = 114.5) and IVB patients (cut-off point = 191.1), statistically significant differences between EMST were also reported, with p-values of 0.0001 and 0.0002, respectively. In both substages and in the entire cohort, patients with MTVWB ≥ cut-off points had lower EMST and survival rates.
Conclusion
Baseline MTVWB, measured on staging [18F]FDG PET/CT, further stratifies stage IV NSCLC patients. This parameter is an independent predictor of OS and provides valuable prognostic information over the 8th edition of cTNM staging.
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Availability of data and materials
The datasets generated and analysed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- [18F]FDG PET/CT:
-
2-Deoxy-2-[18F]fluoro-D-glucose positron emission tomography/computed tomography
- 3-D:
-
Three dimensional
- AJCC:
-
American Joint Committee on Cancer
- Ca.:
-
Carcinoma
- CHUC:
-
Centro Hospitalar e Universitário de Coimbra
- CI:
-
Confidence interval
- C Index:
-
Harrell’s Concordance Index
- cm3 :
-
Cubic centimetre
- CT:
-
Computed tomography
- cTNM staging:
-
Clinical tumour, node, metastasis staging
- EMST:
-
Estimated mean survival time
- FU:
-
Follow-up
- GE:
-
General electric
- HR:
-
Hazard ratio
- IMB:
-
International Business Machines Corporation
- IQR:
-
Interquartile range
- kg:
-
Kilogram
- kV:
-
Kilovolt
- mA:
-
Milliampere
- Max:
-
Maximum
- MBq:
-
Megabecquerel
- MBq.min.bed−1 kg−1 :
-
Megabecquerel.minute.bed−1 kg−1
- Min:
-
Minimum
- min.bed− 1 :
-
Minute.bed−1
- mm:
-
Millimetre
- MTV:
-
Metabolic active tumour volume
- MTVWB :
-
Metabolic active tumour volume of the whole body
- n:
-
Number of individuals
- NSCLC:
-
Non-small cell lung carcinoma
- NY:
-
New York
- OS:
-
Overall survival
- p :
-
p Value
- PET:
-
Positron emission tomography
- PET/CT:
-
Positron emission tomography/computed tomography
- PET_VCAR:
-
Positron emission tomography with volume computer assisted reading
- SD:
-
Standard deviation
- SE:
-
Standard error
- SPSS:
-
Statistical package for the social sciences
- SUV:
-
Standardized uptake value
- SUVmax :
-
Maximum standardized uptake value
- SUVmean :
-
Mean standardized uptake value
- TLG:
-
Total lesion glycolysis
- TLGWB :
-
Total lesion glycolysis of the whole body
- TNM staging:
-
Tumour, node, metastasis staging
- USA:
-
United States of America
- VUE:
-
Virtually unenhanced
- vxtl:
-
Verxatile
- WI:
-
Wisconsin
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Rocha, A.L.G., da Conceição, M.A.M., da Cunha Sequeira Mano, F.X.P. et al. Metabolic active tumour volume quantified on [18F]FDG PET/CT further stratifies TNM stage IV non-small cell lung cancer patients. J Cancer Res Clin Oncol 147, 3601–3611 (2021). https://doi.org/10.1007/s00432-021-03799-w
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DOI: https://doi.org/10.1007/s00432-021-03799-w