Margin Positivity and Survival in Papillary Thyroid Microcarcinoma: A National Cancer Database Analysis

Associations between preoperative thyroid parameters, aggressive clinicopathological features and risk of recurrence in differentiated thyroid cancer

OBJECTIVE

The study aimed (1) to investigate the association between aggressive clinicopathological characteristics and the American Thyroid Association (ATA) recurrence risk classification in differentiated thyroid cancer (DTC) patients, and (2) to investigate the prognostic value of preoperative thyroid parameters.

METHODS

A total of 3833 patients histologically confirmed DTC were recruited. Preoperative clinical and postoperative pathologic data were retrospectively collected. Participants were stratified into low recurrence risk and intermediate-to-high recurrence risk groups based on the ATA risk stratification system.

RESULTS

The study cohort had a mean age of 48.87 ± 8.08 years, and 1,465 (76.82%) were female. Male (OR = 1.37, p = .024), aged 52 years and older (OR = 2.01, p < .001), larger tumor size (OR = 3.71, p = 0.011), nerve invasion (OR = 6.69, p = .004), margin involvement (OR = 5.46, p < .001), multifocality (OR = 3.71, p < .001), and bilaterality (OR = 3.95, p < .001) were identified as risk factors for a higher ATA recurrence risk classification, in addition to established factors such as lymph node metastasis and angioinvasion, after adjusting for potential confounding variables. Higher preoperative levels of free triiodothyronine (FT3), FT3 to free thyroxine (FT3/FT4), and lower thyroid feedback quantile-based index (TFQI) levels were associated with a higher ATA recurrence risk classification. The comprehensive predictive model incorporating these variables demonstrated excellent discrimination (AUC = 0.836). Furthermore, higher FT3/FT4 levels and lower TFQI levels were associated with higher risk of lymph node metastases and angioinvasion.

CONCLUSIONS

Factors such as male sex, older age, multifocality, bilaterality, margin involvement, nerve invasion, larger tumor size, and preoperative thyroid parameters serve as complementary predictors for higher ATA recurrence risk in DTC, in addition to conventional risk factors. These insights contribute to a more nuanced understanding and optimization of current risk stratification methodologies.

Trends and predictors of positive surgical margins in pediatric thyroid cancer

OBJECTIVE

To understand trends in positive margin rates in pediatric thyroid cancer over time and investigate predictors of positive margins.

STUDY DESIGN AND SETTING

Retrospective analysis of deidentified National Cancer Database (NCDB) records from 2004 to 2020.

METHODS

The study cohort included pediatric patients (age 18 or younger) with thyroid cancer with available records in the NCDB. The positive margin rate was calculated by year of diagnosis. Multivariable regression was used to assess for predictors of positive margins. Survival analysis was performed stratified by margin status.

RESULTS

We identified 6240 patients who met inclusion criteria. The overall positive margin rate was 15.5 % and did not change significantly over the study period. Positive margins were independently associated with younger age, male gender, total thyroidectomy, papillary histology, and positive lymph node status on multivariable logistic regression models. Hospital volume was not a predictor of positive margin rate. Margin status did not impact overall survival.

CONCLUSION

Positive margins in pediatric thyroid cancer are more likely in younger patients, male patients, those undergoing total thyroidectomy, those with lymph node metastasis, and those with papillary thyroid carcinoma. Hospital volume is not associated with positive margin rate. Positive margins do not impact overall survival in this patient population.

"Thanks, but no thanks": Factors associated with patients who decline surgical intervention for thyroid cancer

BACKGROUND

Surgery is the mainstay of therapy for thyroid cancer. A rising number of patients decline recommended surgical intervention. This study aimed to identify factors associated with the decision to decline surgery for well-differentiated thyroid cancer.

METHODS

Patients with papillary or follicular thyroid cancer diagnosed between 2004 and 2017 were identified from the National Cancer Database. Patients were grouped based on patient-documented refusal of recommended surgery and patients who successfully completed surgery. Baseline characteristic comparison, univariable and multivariable logistic regression, and survival analyses were performed.

RESULTS

A total of 221,664 patients met inclusion criteria: 565 (0.3%) patients declined and 221,099 (99.7%) underwent recommended surgery. Patients who declined surgery were older, male, Black or Asian, and not privately insured. They more frequently had Charlson-Deyo scores ≥3, were diagnosed at academic centers, and presented with larger tumors and advanced clinical stage. Multivariable modeling demonstrated that older age, Black or Asian race, diagnosis at an academic center, no insurance or lack of private insurance, clinical N stage ≥1a, and clinical M stage >0 were associated with higher odds of declining surgery (P < .001). A mean survival of 10 years was found among patients who declined surgery versus 16 years among patients who underwent surgery (P < .0001).

CONCLUSION

Most patients diagnosed with well-differentiated thyroid cancer undergo physician-recommended surgical intervention. Declining surgery is associated with worse overall survival and is more likely in older, male, Black, or Asian patients with socioeconomic disadvantage. This study underscores the importance of understanding barriers to thyroid cancer surgery and opportunities to optimize outcomes and reduce disparities for these populations.

Nomograms Based on Serum N-glycome for Diagnosis of Papillary Thyroid Microcarcinoma and Prediction of Lymph Node Metastasis

Non-invasive biomarkers for the diagnosis and prognosis of papillary thyroid microcarcinoma (PTMC) are still urgently needed. We aimed to characterize the N-glycome of PTMC, and establish nomograms for the diagnosis of PTMC and the prediction of lymph node metastasis (LNM). N-glycome of PTMC (LNM vs. non-LNM, capsular invasion (CI) vs. non-CI (NCI)) and matched healthy controls (HC) were quantitatively analyzed based on mass spectrometry. N-glycan traits associated with PTMC/LNM were used to create binomial logistic regression models and were visualized as nomograms. We found serum N-glycome differed between PTMC and HC in high-mannose, complexity, fucosylation, and bisection, of which, four N-glycan traits (TM, CA1, CA4, and A2Fa) were significantly associated with PTMC. The nomogram based on four traits achieved good performance for the identification of PTMC. Two N-glycan traits (CA4 and A2F0S0G) showed strong associations with LNM. The nomogram based on two traits showed relatively good performance in predicting LNM. We also found differences between CI and NCI in several N-glycan traits, which were not the same as that associated with LNM. This study reported serum N-glycosylation signatures of PTMC for the first time. Nomograms constructed from aberrant glycans could be useful tools for PTMC diagnosis and stratification.

The optimal extent of lymph node dissection in N1b papillary thyroid microcarcinoma based on clinicopathological factors and preoperative ultrasonography

BACKGROUND

The optimal extent of lymph node (LN) dissection in the management of N1b papillary thyroid microcarcinoma (PTMC) is still under debate in clinical practice, so we aimed to identify the risk factors associated with multilevel lateral lymph node metastasis (LLNM) with regard to the extent of LN dissection.

METHODS

The clinical data of 182 N1b PTMC patients between January 2019 and June 2021 at Tianjin Medical University Cancer Institute and Hospital were retrospectively reviewed. The frequency pattern and distribution of LLNM were analyzed for risk factors. We assessed the diagnostic value of preoperative ultrasonography (USG) for identifying levels II-V metastasis in PTMC patients.

RESULTS

The proportion of multilevel LLNM in N1b PTMC was 72.1%, and the most common pattern was metastasis at two levels (41.2%). Capsule invasion [odds ratio (OR) =6.861, 95% confidence interval (CI): 1.462-32.190, P=0.015], upper pole [OR =2.125, 95% CI: 1.010-4.473, P=0.047], central LN ratio [OR =7.315, 95% CI: 1.309-40.877, P=0.023], thyroid-stimulating hormone (TSH) >1.5 mIU/mL [OR =2.773, 95% CI: 1.269-6.060, P=0.011], and extranodal extension (ENE) [OR =2.632, 95% CI: 1.207-5.739, P=0.015] were independent risk factors for multilevel metastasis. In addition, unltrasonography had high sensitivity and specificity in the diagnosis of metastasis at level V (75.0%, 78.4%) and multilevel LLNM (67.2%, 64.8%).

CONCLUSIONS

Modified radical neck dissection (MRND) in N1b PTMC patients may be reserved for patients with simultaneous 3-level LLNM or clinically evident metastasis at level V. Preoperative USG may have certain suggestive significance in the diagnosis of multilevel LLNM in primary PTMC.

Risk factors of skip lateral cervical lymph node metastasis in papillary thyroid carcinoma: a systematic review and meta-analysis

OBJECTIVE

To analyze and explore the risk factors of skip lateral cervical lymph node metastasis (SLLNM) in papillary thyroid carcinoma (PTC).

METHODS

PubMed, Web of Science, Embase, Cochrane, Wanfang, China National Knowledge Infrastructure, and China Science and Technology Journal databases, updated to April 4, 2021, were systematically searched for literature on the risk factors of SLLNM in PTC. The meta-analysis was completed using Stata 15.0 software after quality evaluation. The odds ratio (OR) and 95% confidence interval (CI) of each variable were calculated using fixed or random-effects models, and the publication bias was evaluated by the Egger's test.

RESULTS

A total of 28 studies with 10,682 cases were included in our meta-analysis; 1592 (14.90%) cases were positive for SLLNM. The meta-analysis showed that female sex (OR = 1.16, 95% CI = 1.02-1.31, P = 0.021), age ≥45 (OR = 1.60, 95% CI = 1.19-2.15, P = 0.002), tumor diameter ≤10 mm (OR = 2.23, 95% CI = 1.62-3.06, P < 0.001), and upper location of tumor (OR = 3.60, 95% CI = 2.65-4.89, P < 0.001) were risk factors for SLLNM in PTC patients. Hashimoto's thyroiditis (OR = 1.02, 95% CI = 0.88-1.19, P = 0.777), multifocality (OR = 0.98, 95% CI = 0.75-1.28, P = 0.873), bilateral tumors (OR = 0.92, 95% CI = 0.70-1.19, P = 0.515), extrathyroidal extensions (OR = 1.07, 95% CI = 0.83-1.39, P = 0.598), and capsular invasion (OR = 0.93, 95% CI = 0.65-1.31, P = 0.660) were not closely related to SLLNM risk.

CONCLUSION

This study confirmed significant associations between SLLNM and female sex, age ≥45, tumor diameter ≤10 mm, and upper location of the tumor.