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Published in: Annals of Surgical Oncology 2/2018

01-02-2018 | Endocrine Tumors

A Novel T-Stage Classification System for Adrenocortical Carcinoma: Proposal from the US Adrenocortical Carcinoma Study Group

Authors: Caroline E. Poorman, BA, Cecilia G. Ethun, MD, Lauren M. Postlewait, MD, Thuy B. Tran, MD, Jason D. Prescott, MD, PhD, Timothy M. Pawlik, MD, MPH, PhD, FACS, Tracy S. Wang, MD, MPH, FACS, Jason Glenn, MD, Ioannis Hatzaras, MD, MPH, FACS, Rivfka Shenoy, MD, John E. Phay, MD, FACS, Kara Keplinger, MD, Ryan C. Fields, MD, FACS, Linda X. Jin, MD, Sharon M. Weber, MD, FACS, Ahmed Salem, MD, Jason K. Sicklick, MD, FACS, Shady Gad, MD, Adam C. Yopp, MD, FACS, John C. Mansour, MD, FACS, Quan-Yang Duh, MD, FACS, Natalie Seiser, MD, PhD, Carmen C. Solórzano, MD, FACS, Colleen M. Kiernan, MD, Konstantinos I. Votanopoulos, MD, FACS, Edward A. Levine, MD, FACS, Charles A. Staley, MD, FACS, George A. Poultsides, MD, FACS, Shishir K. Maithel, MD, FACS

Published in: Annals of Surgical Oncology | Issue 2/2018

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Abstract

Background

The 7th AJCC T-stage system for adrenocortical carcinoma (ACC), based on size and extra-adrenal invasion, does not adequately stratify patients by survival. Lymphovascular invasion (LVI) is a known poor prognostic factor. We propose a novel T-stage system that incorporates LVI to better risk-stratify patients undergoing resection for ACC.

Method

Patients undergoing curative-intent resections for ACC from 1993 to 2014 at 13 institutions comprising the US ACC Group were included. Primary outcome was disease-specific survival (DSS).

Results

Of the 265 patients with ACC, 149 were included for analysis. The current T-stage system failed to differentiate patients with T2 versus T3 disease (p = 0.10). Presence of LVI was associated with worse DSS versus no LVI (36 mo vs. 168 mo; p = 0.001). After accounting for the individual components of the current T-stage system (size, extra-adrenal invasion), LVI remained a poor prognostic factor on multivariable analysis (hazard ratio 2.14, 95% confidence interval 1.05–4.38, p = 0.04). LVI positivity further stratified patients with T2 and T3 disease (T2: 37 mo vs. median not reached; T3: 36 mo vs. 96 mo; p = 0.03) but did not influence survival in patients with T1 or T4 disease. By incorporating LVI, a new T-stage classification system was created: [T1: ≤ 5 cm, (−)local invasion, (+/−)LVI; T2: > 5 cm, (−)local invasion, (−)LVI OR any size, (+)local invasion, (−)LVI; T3: > 5 cm, (−)local invasion, (+)LVI OR any size, (+)local invasion, (+)LVI; T4: any size, (+)adjacent organ invasion, (+/−)LVI]. Each progressive new T-stage group was associated with worse median DSS (T1: 167 mo; T2: 96 mo; T3: 37 mo; T4: 15 mo; p < 0.001).

Conclusions

Compared with the current T-stage system, the proposed T-stage system, which incorporates LVI, better differentiates T2 and T3 disease and accurately stratifies patients by disease-specific survival. If externally validated, this T-stage classification should be considered for future AJCC staging systems.
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Metadata
Title
A Novel T-Stage Classification System for Adrenocortical Carcinoma: Proposal from the US Adrenocortical Carcinoma Study Group
Authors
Caroline E. Poorman, BA
Cecilia G. Ethun, MD
Lauren M. Postlewait, MD
Thuy B. Tran, MD
Jason D. Prescott, MD, PhD
Timothy M. Pawlik, MD, MPH, PhD, FACS
Tracy S. Wang, MD, MPH, FACS
Jason Glenn, MD
Ioannis Hatzaras, MD, MPH, FACS
Rivfka Shenoy, MD
John E. Phay, MD, FACS
Kara Keplinger, MD
Ryan C. Fields, MD, FACS
Linda X. Jin, MD
Sharon M. Weber, MD, FACS
Ahmed Salem, MD
Jason K. Sicklick, MD, FACS
Shady Gad, MD
Adam C. Yopp, MD, FACS
John C. Mansour, MD, FACS
Quan-Yang Duh, MD, FACS
Natalie Seiser, MD, PhD
Carmen C. Solórzano, MD, FACS
Colleen M. Kiernan, MD
Konstantinos I. Votanopoulos, MD, FACS
Edward A. Levine, MD, FACS
Charles A. Staley, MD, FACS
George A. Poultsides, MD, FACS
Shishir K. Maithel, MD, FACS
Publication date
01-02-2018
Publisher
Springer International Publishing
Published in
Annals of Surgical Oncology / Issue 2/2018
Print ISSN: 1068-9265
Electronic ISSN: 1534-4681
DOI
https://doi.org/10.1245/s10434-017-6236-1

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