Publications by authors named "Daniel McKellar"

Article Synopsis
  • Guidelines for breast cancer follow-up recommend imaging for distant metastases only when patients show symptoms, but new research suggests better imaging methods could improve survival rates.
  • In a study of 10,076 women with stage II-III breast cancer, it was found that 23.3% of distant recurrences were detected through imaging, while the majority were symptomatic detections.
  • Asymptomatic imaging was linked to a lower risk of death in patients with triple-negative and HER2-positive cancers, indicating a need for updated clinical recommendations and a randomized trial to explore these findings further.
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Background: Many quality measures in cancer care are process measures. The rates of compliance for these measures over time have not been well described, and the relationships between measure compliance and survival are not well understood.

Methods: The National Cancer Database, representing cancer registry data from approximately 1500 Commission on Cancer (CoC) cancer programs, was queried to determine the rates of compliance, with the CoC's colon cancer quality measure requiring 12 regional lymph nodes be removed at resection.

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Article Synopsis
  • Accurate measurement of comorbidities is essential in cancer research, and this study compares the National Cancer Database's (NCDB) code-based Charlson-Deyo Comorbidity Index (CCI) with a chart-based CCI for breast, colorectal, and lung cancer patients.
  • The analysis involved re-abstracting data from over 31,000 patients to assess how well these CCI versions predict 5-year overall survival after surgery.
  • Results showed the NCDB CCI often underestimated comorbidity rates, particularly in lung cancer patients, but its predictive power for survival was similar to that of the more detailed chart-based CCI.
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Article Synopsis
  • The study aimed to evaluate the relationship between the frequency of post-surgical surveillance for non-small cell lung cancer (NSCLC) and patient survival rates.
  • An analysis of 4,463 NSCLC patients showed that although higher-stage patients received more frequent surveillance, there was no significant correlation between the increased frequency of imaging and improved overall or postrecurrence survival rates.
  • The findings suggest that increasing the frequency of post-surgical check-ups does not lead to better survival outcomes, highlighting the need for reevaluation of current surveillance strategies as lung cancer survivor rates continue to rise.
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Importance: Surveillance testing is performed after primary treatment for colorectal cancer (CRC), but it is unclear if the intensity of testing decreases time to detection of recurrence or affects patient survival.

Objective: To determine if intensity of posttreatment surveillance is associated with time to detection of CRC recurrence, rate of recurrence, resection for recurrence, or overall survival.

Design, Setting, And Participants: A retrospective cohort study of patient data abstracted from the medical record as part of a Commission on Cancer Special Study merged with records from the National Cancer Database.

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Background: Although not guideline recommended, studies suggest 50% of locoregional breast cancer patients undergo systemic imaging during follow-up, prompting its inclusion as a Choosing Wisely measure of potential overuse. Most studies rely on administrative data that cannot delineate scan intent (prompted by signs/symptoms vs. asymptomatic surveillance).

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Background: Annual mammography is recommended after breast cancer treatment. However, studies suggest its under-utilization for Medicare patients. Utilization in the broader population is unknown, as is the role of breast magnetic resonance imaging (MRI).

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Purpose National Comprehensive Cancer Network guidelines recommend systemic staging imaging at the time of locoregional breast cancer recurrence. Limited data support this recommendation. We determined the rate of synchronous distant recurrence at the time of locoregional recurrence in high-risk patients and identified clinical factors associated with an increased risk of synchronous metastases.

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Purpose: Survival is considered an important indicator of the quality of cancer care, but the validity of different methodologies to measure comparative survival rates is less well understood. We explored whether the National Cancer Data Base (NCDB) could serve as a source of unadjusted and risk-adjusted cancer survival data and whether these data could be used as quality indicators for individual hospitals or in the aggregate by hospital type.

Methods: The NCDB, an aggregate of > 1,500 hospital cancer registries, was queried to analyze unadjusted and risk-adjusted hazards of death for patients with stage III breast cancer (n = 116,787) and stage IIIB or IV non-small-cell lung cancer (n = 252,392).

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Importance: The National Cancer Database (NCDB), a joint quality improvement initiative of the American College of Surgeons Commission on Cancer and the American Cancer Society, has created a shared research file that has changed the study of cancer care in the United States. A thorough understanding of the nuances, strengths, and limitations of the database by both readers and investigators is of critical importance. This review describes the use of the NCDB to study cancer care, with a focus on the advantages of using the database and important considerations that affect the interpretation of NCDB studies.

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Objective: Older patients with non-small cell lung cancer (NSCLC) are less likely to receive guideline-recommended treatment at diagnosis, independent of comorbidity. However, national data on treatment of postoperative recurrence are limited. We evaluated the associations between age, comorbidity, and other patient factors and treatment of postoperative NSCLC recurrence in a national cohort.

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The multidisciplinary Commission on Cancer (CoC) and National Accreditation Program for Breast Centers (NAPBC), administered by the American College of Surgeons (ACoS), defines evidence and consensus-based standards, require an operational infrastructure, collect high quality cancer data, and validate compliance with standards through external peer review. A survey of our constituents confirms a high level of agreement that accreditation is regarded as important in improving oncologic outcomes through compliance with standards that include continuous quality improvement.

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A discussion of the uses and future plans of the National Cancer Data Base, which has been reengineered in recent years for applying and reporting quality measure data and most recently for rapid case ascertainment and patient care tracking.

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Lymphoma presenting as a breast mass is rare, although well documented. Although recurrence rates can reach approximately 50%, recurrence in the contralateral breast is rare. We report a case of recurrent primary breast lymphoma (PBL), which was discovered on screening mammography after a 5-year disease-free interval from initial diagnosis.

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