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Metabolic active tumour volume quantified on [18F]FDG PET/CT further stratifies TNM stage IV non-small cell lung cancer patients

  • Original Article – Cancer Research
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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.bed1 kg1

Min:

Minimum

min.bed 1 :

Minute.bed1

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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Funding

No funding was received to assist with the preparation of this manuscript.

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Correspondence to Ana Luísa Gomes Rocha.

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Conflict of interest

The authors have no conflict of interest to declare that are relevant to the content of this article.

Ethics approval

Approval was obtained from the Ethics Committee of Centro Hospitalar e Universitário de Coimbra. The procedures used in this study adhere to the tenets of the Declaration of Helsinki.

Informed consent

The need for informed consent was waived.

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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

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