Prognostic Value of Tumor Deposits for Patients With Papillary Thyroid Carcinoma

Study Overview
=================
Brief Summary
-----------------
Tumor deposits (TD), nodules in the peritumoral adipose tissue with no architectural residue of lymph node, which is a definition often being confusing to the extranodal extension (ENE), have been described in several malignancies and linked to a worse prognosis. In gastric cancer and colon cancer, TD and ENE should be distinguished and collected separately in 8th AJCC manual. However, in thyroid cancer, TD as a collection variable was absence in both the 8th AJCC manual and the 2015 ATA guideline. This is a study that revealed the presence of TD by reviewing a large number of papillary thyroid carcinoma (PTC) specimens and explored its prognostic value by constructing a nomogram to accurately predict disease-free survival in PTC patients.

Official Title
-----------------
Prognostic Value of Tumor Deposits for Patients With Papillary Thyroid Carcinoma: a Retrospective Cohort Study

Conditions
-----------------
Exploring the Prognostic Value of Tumor Deposits PTC Patients

Intervention / Treatment
-----------------
* Procedure: surgery


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: (1) patients with histopathologically confirmed PTC and sections stored in the pathology department; (2) patients underwent lobectomy or total thyroidectomy and central lymph node dissection with or without lateral neck dissection; (3) patients cooperated to provide follow-up information after surgery. Exclusion Criteria: (1) patients with previous history of neck irradiation or other systematic cancers; (2) patients died of unrelated diseases.
Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| TD cohort<br>Tumor deposits (TD) positive group, which was determinded by the pathologists at department of pathology. Any tumor mass, either circumscribed or with irregular contours, devoid of lymph node architecture was identified as a tumor deposit. | Procedure: surgery<br>* if the patients is TD positive, we recommond careful surgery and pathological examination.<br>|
| Non-TD cohort<br>Tumor deposits (TD) negative group, which was determinded by the pathologists at department of pathology. No visiblet umor mass, either circumscribed or with irregular contours, devoid of lymph node architecture in the sections of specimens from these patients. | Procedure: surgery<br>* if the patients is TD positive, we recommond careful surgery and pathological examination.<br>|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| disease-free survival (DFS) after diagnosis | The primary outcome was disease-free survival (DFS) after diagnosis, with endpoints as tumor locoregional recurrence, distant metastasis, and disease-specific death. If a patient was deceased, the cause of death was confirmed by the death certificate or the hospitalization record to identify disease-specific death. | between 2015 and 2021 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Disease recurrence | Disease recurrence was defined as recurrent or persistent PTC identified with standard biochemical, cytological, histological, and radiographical criteria. In this study, tumor locoregional recurrence was defined as combined biochemical (serum thyroglobulin) and structural recurrences. | between 2015 and 2021 | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
tumor deposits, extranodal extension, papillary thyroid carcinoma, lymph node metastasis, prognosis.