Disparities Research in Thyroid Cancer: Challenges and Strategies for Improvement

Patterns in the Reporting of Aggressive Histologic Subtypes in Papillary Thyroid Cancer

INTRODUCTION

The tall cell, columnar, and diffuse sclerosing subtypes are aggressive histologic subtypes of papillary thyroid cancer (PTC) with increasing incidence, yet there is a wide variation in reporting. We aimed to identify and compare factors associated with the reporting of these aggressive subtypes (aPTC) to classic PTC (cPTC) and secondarily identify differences in outcomes.

METHODS

The National Cancer Database was utilized to identify cPTC and aPTC from 2004 to 2017. Patient and facility demographics and clinicopathologic variables were analyzed. Independent predictors of aPTC reporting were identified and a survival analysis was performed.

RESULTS

The majority of aPTC (67%) were reported by academic facilities. Compared to academic facilities, all other facility types were 1.4-2.0 times less likely to report aPTC (P < 0.05). Regional variation in reporting was noted, with more cases reported in the Middle Atlantic, despite there being more total facilities in the South Atlantic and East North Central regions. Compared to the Middle Atlantic, all other regions were 1.4-5 times less likely to report aPTC (P < 0.001). Patient characteristics including race and income were not associated with aPTC reporting. Compared to cPTC, aPTC had higher rates of aggressive features and worse 5-y overall survival (90.5% versus 94.5%, log rank P < 0.001).

CONCLUSIONS

Aggressive subtypes of PTC are associated with worse outcomes. Academic and other facilities in the Middle Atlantic were more likely to report aPTC. This suggests the need for further evaluation of environmental or geographic factors versus a need for increased awareness and more accurate diagnosis of these subtypes.

The impact of social determinants of health on thyroid cancer mortality and time to treatment

BACKGROUND

Whereas racial disparities in thyroid cancer care are well established, the role of social determinants of health is less clear. We aimed to assess the individual and cumulative impact of social determinants of health on mortality and time to treatment among patients with thyroid cancer.

METHODS

We collected social determinants of health data from thyroid cancer patients registered in the National Cancer Database from 2004 to 2017. We created a count variable for patients in the lowest quartile of each social determinant of health (ie, low income, low education, and no insurance). We assessed the association of social determinants of health with mortality and time to treatment and the association between cumulative social determinants of health count and time to treatment using Cox regression.

RESULTS

Of the 142,024 patients we identified, patients with longer time to treatment had greater mortality compared to patients treated within 90 days (90-180 days, adjusted hazard ratio 1.21 (95% confidence interval 1.13-1.29, P < .001); >180 days, adjusted hazard ratio 1.57 (95% confidence interval 1.41-1.76, (P < .001). Compared to patients with no adverse social determinants of health, patients with 1, 2, or 3 adverse social determinants of health had a 10%, 12%, and 34%, respectively, higher likelihood of longer time to treatment (1 social determinant of health, hazard ratio 0.90, 95% confidence interval 0.89-0.92, P < .001; 2 social determinants of health, hazard ratio 0.88, 95% confidence interval 0.87-0.90, P < .001; 3 social determinants of health, hazard ratio 0.66, 95% confidence interval 0.62-0.71, P < .001 for all). On subgroup analysis by race, each adverse social determinant of health was associated with an increased likelihood of a longer time to treatment for Black and Hispanic patients (P < .05).

CONCLUSION

A greater number of adverse social determinants of health leads to a higher likelihood of a longer time to treatment for patients with thyroid cancer, which, in turn, is associated with an increased risk for mortality.

Hidden Disparities: How Language Influences Patients' Access to Cancer Care

BACKGROUND

Patients with limited English proficiency, a vulnerable patient population, remain understudied in the literature addressing cancer disparities. Although it is well documented that language discordance between patients and physicians negatively impacts the quality of patient care, little is known about how patients' preferred spoken language impacts their access to cancer care.

PATIENTS AND METHODS

Between November 2021 and June 2022, we conducted an audit study of 144 hospitals located across 12 demographically diverse states. Using a standardized script, trained investigators assigned to the roles of English-speaking, Spanish-speaking, and Mandarin-speaking patients called the hospital general information telephone line seeking to access care for 3 cancer types that disproportionately impact Hispanic and Asian populations (colon, lung, and thyroid cancer). Primary outcome was whether the simulated patient caller was provided with the next steps to access cancer care, defined as clinic number or clinic transfer. We used chi-square tests and logistic regression analysis to test for associations between the primary outcome and language type, region type, hospital teaching status, and cancer care requested. We used multivariable logistic regression analysis to determine factors associated with simulated patient callers being provided the next steps.

RESULTS

Of the 1,296 calls, 52.9% (n=686) resulted in simulated patient callers being provided next steps to access cancer care. Simulated non-English-speaking (vs English-speaking) patient callers were less likely to be provided with the next steps (Mandarin, 27.5%; Spanish, 37.7%; English, 93.5%; P<.001). Multivariable logistic regression found significant associations of the primary outcome with language spoken (Mandarin: odds ratio [OR], 0.02 [95% CI, 0.01-0.04] and Spanish: OR, 0.04 [95% CI, 0.02-0.06] vs English) and hospital teaching status (nonteaching: OR, 0.43 [95% CI, 0.32-0.56] vs teaching).

CONCLUSIONS

Linguistic disparities exist in access to cancer care for non-English-speaking patients, emphasizing the need for focused interventions to mitigate systems-level communication barriers.

Update on Molecular Diagnostics in Thyroid Pathology: A Review

Thyroid nodules are quite common, and the determination of a nodule of concern is complex, involving serum testing, radiology and, in some cases, pathological evaluation. For those nodules that raise clinical concern of neoplasia, fine needle aspiration biopsy is the gold standard for evaluation; however, in up to 30% of cases, results are indeterminate for malignancy, and further testing is needed. Advances in molecular testing have shown it to be of benefit for both diagnostic and prognostic purposes, and its use has become an integral part of thyroid cancer management in the United States and in several global nations. After The Cancer Genome Atlas (TCGA) consortium published its molecular landscape of papillary thyroid carcinoma (PTC) and reduced the "black matter" in PTC from 25% to 3.5%, further work ensued to clarify the remaining fraction not neatly attributed to the BRAF^V600E-like or RAS-like phenotypes of the TCGA. Over the past decade, commercial molecular platforms have been refined as data accrues, and they increasingly cover most genetic variants of thyroid carcinomas. Molecular reporting focuses on the nodule tested, including related clinical information for that nodule (size of nodule, Bethesda category, etc.). This results in a comprehensive report to physicians that may also include patient-directed, clear language that facilitates conversations about nodule management. In cases of advanced or recurrent disease, molecular testing may become essential for devising an individual therapeutic plan. In this review, we focus on the evolution of integrated molecular testing in thyroid nodules, and how our understanding of tumor genetics, combined with histopathology, is driving the next generation of rational patient management, particularly in the context of emerging small, targetable therapeutics.

Access Denied: Disparities in Thyroid Cancer Clinical Trials

For thyroid cancer clinical trials, the inclusion of participants from diverse patient populations is uniquely important given existing racial/ethnic disparities in thyroid cancer care. Since 2011, a paradigm shift has occurred in the treatment of advanced thyroid cancer with the approval of multiple systemic therapies by the US Food and Drug Administration based on their use in the clinical trials setting. Although these clinical trials recruited patients from up to 164 sites in 25 countries, the inclusion of racial/ethnic minority patients remained low. In this mini-review, we provide an overview of barriers to accessing cancer clinical trials, framed in the context of why patients with thyroid cancer may be uniquely vulnerable. Multilevel interventions and increased funding for thyroid cancer research are necessary to increase access to and recruitment of under-represented patient populations into thyroid cancer clinical trials.

Disparities in Treatment for Differentiated Thyroid Cancer

Purpose: Disparities in the diagnosis and treatment of patients with differentiated thyroid cancer (DTC) have been described. This review includes the most recent literature on existing diagnostic and treatment disparities in the United States and proposes practical clinical and policy ideas for improving the gap in the treatment of DTC. Methodology: We performed a comprehensive literature review to include key articles related to DTC and disparities of treatment, diagnosis, and outcomes for disadvantaged patient populations. Results: Vulnerable patient populations with DTC have been extensively studied, and the literature shows that clear disparities of diagnosis and treatment exist. Socioeconomically disadvantaged patients, uninsured, rural, elderly, and patients belonging to minoritized racial and ethnic groups are more likely to present with advanced disease at presentation. These same vulnerable patient populations are less likely to have access to high-volume surgeons, less likely to be treated according to guidelines, and receive less aggressive treatment (such as radioactive iodine) compared with white patients. Further, these patients experience financial toxicity more so than their counterparts. Conclusions: Disparities of care exist for certain vulnerable patient populations with DTC. Approaches to rectify these should be multipronged and involve improving access to high-volume specialists with ongoing use of telehealth consults, language concordant care, an emphasis on guideline-directed therapies, ensuring continuity of care and long-term follow-up with better community partnerships, engage diverse patients in national guideline-writing committees of prominent societies and reducing the financial burden of cancer treatments at the state and national policy level.

Prevalence of thyroid dysfunction and its relationship to income level and employment status: a nationwide population-based study in Spain

PURPOSE

The influence of socioeconomic conditions on the prevalence of thyroid dysfunction in the population has been scarcely studied to date. The aim of this study has been to evaluate the influence of income level and employment status on the prevalence of hypothyroidism and hyperthyroidism.

METHODS

A cross-sectional study was performed using the population-based database BDCAP (Base de Datos Clínicos de Atención Primaria, Primary Care Clinical Database) to analyze the prevalence of thyroid dysfunction in the Spanish population classified by income groups and employment status.

RESULTS

Of the 40,613,229 people registered in the BDCAP in 2020, there were 2,596,041 (6.39%) with a diagnosis of hypothyroidism and 418,722 (1.03%) with hyperthyroidism. The prevalence of hypothyroidism in people with high income (≥ 100,000 euros/year), medium income (18,000-99,999 euros/year), low income (< 18,000 euros/year), and very low income were, respectively, 4.23%, 5.74%, 6.75%, and 7.01% (P < 0.001). The prevalence of hyperthyroidism in the same income groups also showed an increasing trend as income decreased (0.65%, 0.94%, 1.08%, and 1.10%; P < 0.001). Unemployed people had higher frequencies of hypothyroidism (7.35%) and hyperthyroidism (1.22%) than working people (5.80 and 1.00%, respectively) and inactive people (4.21 and 0.52%, respectively; P < 0.001).

CONCLUSION

Socioeconomic conditions are related to the prevalence of thyroid dysfunction. Low-income or unemployed people have a higher frequency of both hypothyroidism and hyperthyroidism.

Variation in the Diagnosis of Noninvasive Follicular Thyroid Neoplasm with Papillary-like Nuclear Features

CONTEXT

Noninvasive encapsulated follicular variant of papillary thyroid cancer was reclassified as noninvasive follicular thyroid neoplasm with papillary-like nuclear features (NIFTP) in January 2017. The impact of this nomenclature change at a population level remains unknown.

OBJECTIVE

Examine use of NIFTP across different US regions and populations.

DESIGN

Descriptive epidemiology study using SEER-22 data (2000-2019).

PARTICIPANTS

Individuals diagnosed with papillary or follicular thyroid cancer (2000-2019) or NIFTP (2017-2019).

MAIN OUTCOME MEASURES

Annual incidence rates of thyroid cancer by subtype and NIFTP. Using 2018-2019 data, (1) rates of NIFTP at the 17 SEER-22 sites and (2) comparison of demographics for patients diagnosed with NIFTP vs papillary and follicular thyroid cancer.

RESULTS

NIFTP comprised 2.2% and 2.6% of cases in 2018 and 2019, respectively. Between 2018 and 2019, large heterogeneity was observed in the regional use of NIFTP diagnosis, with site-specific incidence rates between 0.0% and 6.2% (median 2.8%, interquartile range 1.3-3.6%). A diagnosis of NIFTP (vs papillary and follicular thyroid cancer) in 2018 and 2019 was significantly associated with older age (P = 0.012 and P = 0.009, respectively), Black race (both Ps < 0.001), and non-Hispanic ethnicity (both Ps < 0.001).

CONCLUSIONS

Marked variation exists in the use of the NIFTP diagnosis. The recent 2021 coding change that resulted in NIFTP, a tumor with uncertain malignant potential and for which there is no long-term outcome data available, no longer being a reportable diagnosis to SEER will disproportionately affect vulnerable patient groups such as older patients and Black patients, in addition to patients who reside in regions with higher rates of NIFTP diagnoses.

Economic and Cardiometabolic Risk Factors Are Predictors of Lower Thyroid Stimulating Hormone (TSH) Levels in Hispanic/Latinx Adults with Euthyroidism-A Community-Based Study

Thyroid hormone abnormalities are among the most common endocrine disorders comorbidly suffered alongside metabolic syndrome and type 2 diabetes mellitus (T2DM), and within the euthyroid range they may also impact other outcomes, such as mood disorders. This study aimed to observationally examine the relationship between TSH and social determinants of health and clinical measures in a euthyroid Hispanic/Latinx patient sample with a diagnosis of anxiety and/or depression disorders from a community health clinic. A needs assessment was completed using a random sample of 100 de-identified medical records of individuals who received free medical care, including mental health, at a community-based clinic. Those with low normal TSH (<2 mIU/L) compared with high normal TSH (≥2 mIU/L) had a greater odds of food insecurity (p = 0.016) and being at 100% of the federal poverty level (p = 0.015). The low normal TSH group had significantly higher fasting glucose (p = 0.046), hemoglobin A1c (p = 0.018), and total cholesterol (p = 0.034) compared with the high normal TSH group. In those with T2DM, individuals with low normal TSH had six-times greater odds of having high fasting glucose (p = 0.022) and high hemoglobin A1c (p = 0.029). These relationships warrant further study, to inform future public health policies and follow-up care for underserved and vulnerable communities.

Disparities in Thyroid Care

Thyroid disease affects an estimated 20 million Americans, with 1 in 8 women developing a thyroid disorder during her lifetime. Although most patients with thyroid cancer have a good prognosis and effective treatments for benign thyroid disease are available, disparities exist in thyroid care and result in worse outcomes for racial and ethnic minorities. Inequities in the diagnosis and treatment of thyroid disease are due to the complex interplay of systems-, physician-, and patient-level factors. Thus, innovative strategies that take an ecological approach to addressing racial disparities are needed to achieve equitable care for all patients with thyroid disease.

Physician Specialties Involved in Thyroid Cancer Diagnosis and Treatment: Implications for Improving Health Care Disparities

CONTEXT

Little is known about provider specialties involved in thyroid cancer diagnosis and management.

OBJECTIVE

Characterize providers involved in diagnosing and treating thyroid cancer.

DESIGN/SETTING/PARTICIPANTS

We surveyed patients with differentiated thyroid cancer from the Georgia and Los Angeles County Surveillance, Epidemiology and End Results registries (N = 2632, 63% response rate). Patients identified their primary care physicians (PCPs), who were also surveyed (N = 162, 56% response rate).

MAIN OUTCOME MEASURES

(1) Patient-reported provider involvement (endocrinologist, surgeon, PCP) at diagnosis and treatment; (2) PCP-reported involvement (more vs less) and comfort (more vs less) with discussing diagnosis and treatment.

RESULTS

Among thyroid cancer patients, 40.6% reported being informed of their diagnosis by their surgeon, 37.9% by their endocrinologist, and 13.5% by their PCP. Patients reported discussing their treatment with their surgeon (71.7%), endocrinologist (69.6%), and PCP (33.3%). Physician specialty involvement in diagnosis and treatment varied by patient race/ethnicity and age. For example, Hispanic patients (vs non-Hispanic White) were more likely to report their PCP informed them of their diagnosis (odds ratio [OR]: 1.68; 95% CI, 1.24-2.27). Patients ≥65 years (vs <45 years) were more likely to discuss treatment with their PCP (OR: 1.59; 95% CI, 1.22-2.08). Although 74% of PCPs reported discussing their patients' diagnosis and 62% their treatment, only 66% and 48%, respectively, were comfortable doing so.

CONCLUSIONS

PCPs were involved in thyroid cancer diagnosis and treatment, and their involvement was greater among older patients and patients of minority race/ethnicity. This suggests an opportunity to leverage PCP involvement in thyroid cancer management to improve health and quality of care outcomes for vulnerable patients.

Progress and Challenges in Thyroid Cancer Management

The state of thyroid cancer in 2021 is reviewed including the prevalence of thyroid cancer, vulnerable patient groups such as women and young adults, and known and hypothesized risk factors for thyroid cancer. Understanding the overdiagnosis and overtreatment of thyroid cancer and recent efforts to reduce harms secondary to overdiagnosis and overtreatment are addressed with optimism that future work will continue to evaluate and improve the care of patients with thyroid cancer.

Financial Hardship Among Hispanic Women with Thyroid Cancer

Background: Little is known about financial hardship among Hispanic women with thyroid cancer. The goal of this study was to determine the prevalence of financial hardship and to identify correlates of financial hardship in this understudied patient group. Methods: We surveyed Hispanic women who had diagnoses of thyroid cancer reported to the Los Angeles Surveillance Epidemiology and End Results (SEER) registry in 2014-2015, and who had previously completed our thyroid cancer survey in 2017-2018 (N = 273; 80% response rate). Acculturation was assessed with the Short Acculturation Scale for Hispanics (SASH). Patients were asked about three outcome measures since their thyroid cancer diagnosis: (i) financial status, (ii) insurance status, and (iii) material measures of financial hardship, collapsed into a single composite measure of financial hardship. We used multivariable logistic regression to identify correlates of financial hardship. Results: Patients' median age at diagnosis was 47 years (range 20-79 years); 49% were low-acculturated and 47% reported financial hardship. Since their thyroid cancer diagnosis, 31% and 12% of the cohort reported being worse off regarding financial and insurance status, respectively. In multivariable analysis, high-acculturated older women were less likely to experience financial hardship compared with high-acculturated 20-year-old women. While financial hardship decreased with age for high-acculturated women (p = 0.002), financial hardship remained elevated across all age groups for low-acculturated women (p = 0.54). Conclusions: Our findings suggest that across all age groups, low-acculturated Hispanic women with thyroid cancer are vulnerable to financial hardship, emphasizing the need for tailored patient-focused interventions.