Cancer Clinical Trial
Official title:
Can Extracapsular Lymph Node Involvement be a Tool to Fine-tune UICC TNM 7th Edition for Esophageal Carcinoma?
It is well known that lymph node metastasis is one of the most important prognostic factors
in oesophageal carcinoma.
The investigators want to determine the influence of lymph node characteristics, being
either intracapsular or extracapsular, on overall survival after esophagectomy for
esophageal cancer.
The classification of carcinoma of the esophagus has undergone a major modification between
the UICC sixth (TNM-6) and TNM-7 edition. Regional lymph nodes (N) are now subdivided by the
number of involved lymph nodes (pN0, 0; pN1, 1-2; pN2, 3-6; pN3 > 6), and distant metastasis
(M) has been simplified to M1 rather than subdivided by location [1].
Nevertheless, TNM-7 doesn't take into consideration the morphologic characteristics of the
metastatic lymph node itself. Since our first publications showing a negative relationship
between presence of extracapsular lymph node involvement (EC-LNI) and survival [2], little
has been published about the prognostic impact of this specific characteristic .
In our latest publication "Can extracapsular lymph node involvement be a tool to fine-tune
pN1 for adenocarcinoma in UICC TNM 7th Edition?" [3], the investigators found a significant
survival benefit for adenocarcinoma without extracapsular lymph node involvement in pN1 (=
1-2 positive lymph nodes) as compared to N2-N3 disease, treated by primary surgery.
Moreover, pN1 patients with extracapsular lymph node involvement (EC-LNI) showed a survival
that was comparable to patients with more than 2 positive lymph nodes (i.e. stage IIIB).
These findings may have important consequences for future TNM adaptations.
The aim of this study is to validate our results on a larger, multicentric cohort, and if
possible make recommendations and possible fine-tuning for a future TNM adaptation,
including the characteristics of the metastatic lymph node itself, being intra- or
extracapsular.
Furthermore the investigators want to examine if these effects are valid in pre-treated
patients, i.e. surgery after neoadjuvant chemo(radiation) therapy. Although these patients
are not incorporated in the current TNM classification, future adaptations to the TNM
classification system will also examine the effects of neoadjuvant therapy (cfr.
Rice/Blackstone WECC -Worldwide Esophageal Cancer Collaboration).
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Observational Model: Cohort, Time Perspective: Retrospective
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