Black/white differences in treatment and survival among women with stage IIIB-IV breast cancer at diagnosis: a US population-based study

Patterns of chemotherapy receipt among patients with hormone receptor-positive, HER2-negative breast cancer

BACKGROUND

Breast cancer chemotherapy utilization not only may differ by race and age, but also varies by genomic risk, tumor characteristics, and patient characteristics. Studies in demographically diverse populations with both clinical and genomic data are necessary to understand potential disparities by race and age.

METHODS

In the Carolina Breast Cancer Study Phase 3 (2008-2013), chemotherapy receipt (yes/no) and regimen type were assessed in association with age and race among hormone receptor (HR) positive and HER2-negative tumors (n = 1862). Odds ratios were estimated for the association between demographic factors and chemotherapy receipt.

RESULTS

Monotonic decreases in frequency of adjuvant chemotherapy receipt were observed over time during the study period, while neoadjuvant chemotherapy was stable. Younger age was associated with chemotherapy receipt (OR [95% CI]: 2.9 [2.4, 3.6]) and with anthracycline-based regimens (OR [95% CI]: 1.7 [1.3, 2.4]). Participants who had Medicaid (OR [95% CI]: 1.8 [1.3, 2.5]), lived in rural settings (OR [95% CI]: 1.4 [1.0, 2.0]), or were Black (OR [95% CI]: 1.5 [1.2, 1.8]) had slightly higher odds of chemotherapy, but these associations were non-significant with adjustment for stage and grade. Associations between younger age and chemotherapy receipt were strongest among women who did not receive genomic testing.

CONCLUSIONS

While race was not strongly associated with chemotherapy receipt, younger age remains a strong predictor of chemotherapy receipt, even with adjustment for clinical factors and among women who receive genomic testing.

Socioeconomic and racial disparities in survival for patients with stage IV cancer

BACKGROUND

Disparities in cancer outcomes for minoritized people and groups experiencing disadvantages with Stage IV cancer is largely unknown.

METHODS

Patients with Stage IV pancreatic, colorectal, lung, breast, and prostate cancer were identified from 2004 to 2015 in the National Cancer Database. Cox proportional hazard models were used to quantify how demographics and treatments received were associated with overall survival.

RESULTS

903,151 patients were included. Patients who were younger, non-Hispanic White, had private insurance, higher income, or received care at an academic center were more likely to receive surgery, chemotherapy, and/or radiation therapy (p < 0.001). Black patients, those with Medicare, Medicaid, no insurance, and lower income had lower survival rates across all five cancer types (p < 0.001). On multivariable analysis, receipt of surgery, radiation, and chemotherapy attenuated but did not eliminate this worse survival (p < 0.001).

CONCLUSIONS

Survival for patients with Stage IV cancer differs by socioeconomic and self-reported racial classifications.

Endocrine therapy initiation among women with stage I-III invasive, hormone receptor-positive breast cancer from 2001-2016

PURPOSE

This retrospective cohort study examined patterns of endocrine therapy initiation over time and by demographic, tumor, and treatment characteristics.

METHODS

We included 7777 women from three U.S. integrated healthcare systems diagnosed with incident stage I-III hormone receptor-positive breast cancer between 2001 and 2016. We extracted endocrine therapy from pharmacy dispensings, defining initiation as dispensings within 12 months of diagnosis. Demographic, tumor, and treatment characteristics were collected from electronic health records. Using generalized linear models with a log link and Poisson distribution, we estimated initiation of any endocrine therapy, tamoxifen, and aromatase inhibitors (AI) over time with relative risks (RR) and 95% confidence intervals (CI) adjusted for age, tumor characteristics, diagnosis year, other treatment, and study site.

RESULTS

Among women aged 20+ (mean 62 years), 6329 (81.4%) initiated any endocrine therapy, and 1448 (18.6%) did not initiate endocrine therapy. Tamoxifen initiation declined from 67 to 15% between 2001 and 2016. AI initiation increased from 6 to 69% between 2001 and 2016 in women aged ≥ 55 years. The proportion of women who did not initiate endocrine therapy decreased from 19 to 12% between 2002 and 2014 then increased to 17% by 2016. After adjustment, women least likely to initiate endocrine therapy were older (RR = 0.81, 95% CI 0.77-0.85 for age 75+ vs. 55-64), Black (RR = 0.93, 95% CI 0.87-1.00 vs. white), and had stage I disease (RR = 0.88, 95% CI 0.85-0.91 vs. stage III).

CONCLUSIONS

Despite an increase in AI use over time, at least one in six eligible women did not initiate endocrine therapy, highlighting opportunities for improving endocrine therapy uptake in breast cancer survivors.

Impact of Inequities on Delay in Breast Cancer Management in Women Undergoing Second Opinions

BACKGROUND

Inequities in breast cancer treatment lead to delay in therapy, decreased survival and lower quality of life. This study aimed to examine demographics and clinical factors impacting time to treatment for second-opinion breast cancer patients.

MATERIALS AND METHODS

We performed a retrospective chart review to analyze patients presenting to one academic institution for second opinion of breast imaging, diagnosis, or breast-related treatment. Data from women with stage I-III breast cancer who received treatment at this institution were evaluated to determine the impact of patient demographics and clinical characteristics on time to first treatment.

RESULTS

Of the 1006 charts reviewed, 307 met inclusion criteria. Low-income patients averaged 58 days from diagnosis to surgery compared to 35 days for high-income patients (incidence rate ratio [IRR] 0.64, P<0.01). Black patients averaged 56 days from diagnosis to surgery compared to 42 days for White patients (IRR 1.37, P<0.01). Latina patients averaged 38 days from initial encounter to neoadjuvant chemotherapy compared to 20 days for White patients (IRR 1.69, P<0.05).

CONCLUSION

Patients with low-income, of Black race and Latina ethnicity experienced increased time to treatment. Additionally, time to mastectomy with and without reconstruction was longer than time to partial mastectomy. Further exploration is needed to determine why certain factors lead to treatment delay and how inequities can be eliminated.

Outcome disparities in colorectal cancer: a SEER-based comparative analysis of racial subgroups

PURPOSE

Previous studies of ethnic disparities in colorectal cancer (CRC) have focused mainly on patients of Caucasian and African-American descent. We aimed to evaluate outcomes for a range of races, representing a broader demographic of the US population.

METHODS

The Surveillance, Epidemiology, and End Results database was queried to identify patients with CRC diagnosed between 1994 and 2014. We performed unadjusted Kaplan-Meier test and multivariable covariate-adjusted Cox models to calculate the overall and CRC-specific survival of patients according to their race.

RESULTS

We identified 401,723 patients diagnosed with CRC between 1994 and 2014. Overall survival (OS) and CRC-specific survival were compared across different races stratified by age, sex, marital status, disease stage and grade, and undergoing surgery as a treatment. Overall, Asian/Pacific Islanders and Hispanics had improved CRC-specific survival compared to Whites (HR = 0.873, 95%CI 0.853-0.893, P < .001, and HR = 0.958, 95%CI 0.937-0.979, P < .001, respectively). Blacks had the worst CRC-specific survival outcomes when compared to Whites (HR = 1.215, 95%CI 1.192-1.238, P < .001). Racial disparity persisted when looking at two different time periods (1994-2003 and 2004-2014).

CONCLUSIONS

Asians/Pacific Islanders have improved outcomes from CRC compared to other races. Multifactorial, including genetic, environmental, and socioeconomic factors appear to influence outcomes and need to be addressed separately in order to reduce racial disparities among patients with CRC.

Factors associated with self-reported falls, balance or walking difficulty in older survivors of breast, colorectal, lung, or prostate cancer: Results from Surveillance, Epidemiology, and End Results-Medicare Health Outcomes Survey linkage

Background

Cancer and its treatment affect body systems that are important in preventing falls and controlling balance/walking. This study examined factors associated with self-reported falls and balance/walking difficulty in the past 12 months in older survivors of four major cancers.

Methods

This was a cross-sectional study analyzing population-based data from Surveillance, Epidemiology, and End Results–Medicare Health Outcomes Survey (SEER-MHOS). Data from cohorts 9 to 14 (January 2006 to December 2013) were extracted. Inclusion criteria were: age ≥65 years at cancer diagnosis, first MHOS completed during years 1–5 post-cancer diagnosis, first primary breast (n = 2725), colorectal (n = 1646), lung (n = 752), and prostate (n = 4245) cancer, and availability of cancer staging information. Primary outcomes were self-reported falls and balance/walking difficulty in the past 12 months. Multivariable logistic regression was constructed for each cancer type to examine independent factors associated with falls and balance/walking difficulty.

Results

In all cancer types, advancing age at cancer diagnosis and dependence in activities of daily living were significant independent factors associated with increased odds of reporting falls and balance/walking difficulty in the past 12 months. Additionally, depression was independently associated with falls and sensory impairment in feet was independently linked to balance/walking difficulty in all cancer types. Other independent factors of falls and balance/walking difficulty varied across cancer types. In breast cancer only, localized or regional cancer stage was significantly associated with increased odds of reporting falls and balance/walking difficulty, whereas treatment with radiation decreased the odds of falling. No association between falls and balance/walking difficulty with time since cancer diagnosis, cancer stage, or cancer treatment was found in colorectal, lung, and prostate cancer.

Conclusion

There exists some heterogeneity in factors associated with self-reported falls and balance/walking difficulty between different cancer types. Future research is necessary to ascertain factors predictive of falls and balance/walking difficulty in older cancer survivors, particularly factors related to cancer diagnosis and treatment.