Research theme

Place and vulnerability

How neighborhood, rurality and historic policy shape access to high-quality cancer care.

62 articles, newest first

  1. Rural Residence and Postsurgical Outcomes Among Medicare Beneficiaries

    Mullens CL, Diaz A, Bredbeck BC, Kunnath N, Dimick JB, Ibrahim AM. JAMA Netw Open. 2026.

    Among Medicare patients having common general surgery operations, living in a rural area was associated with higher rates of death, complications and readmission and a lower chance of being discharged home.

  2. Distribution of pancreatic cancer surgery centers and spatial access to care

    Paro A, Woldesenbet S, Diaz A, et al. J Gastrointest Surg. 2025.

    In the United States, more than 1 in 3 people lived beyond a 90-minute drive of a high-volume pancreatic cancer surgery center, mostly in rural, socially vulnerable communities.

  3. Changes in surgical quality and access after rural hospital closures

    Mullens CL, Johnson PL, Probst JC, Dimick JB, Ibrahim AM, Diaz A. Health Aff Sch. 2025.

    After rural hospitals closed, Medicare patients who lost their nearest or second-nearest hospital showed no significant change in the quality of common operations; those who lost their nearest hospital traveled farther for surgery.

  4. Surgeon Workforce in Underserved Communities

    Taylor CD, Schaefer SL, Diaz A, Kunnath N, Scott JW, Ibrahim AM. JAMA Health Forum. 2024.

  5. Poverty and Its Impact on Surgical Care

    Diaz A, Pawlik TM. Adv Surg. 2024. Review

    This review describes how poverty, which extends beyond finances to barriers involving health care infrastructure, geographic isolation and education, results in persistent disparities in access to high-quality surgical care, with heightened risks for minority patients.

  6. Bridging the Gap: Addressing Social Determinants to Enhance Access to Surgical Care and Improve Survival in Early-stage Colon Cancer

    Diaz A, Pawlik TM. Ann Surg. 2024.

  7. Development of Neighborhood Trajectories Employing Historic Redlining and the Area Deprivation Index

    Carlos HA, Weiss JE, Carter B, Akré EL, Diaz A, Loehrer AP. J Urban Health. 2024.

    Using historic redlining maps for the entire United States and current neighborhood deprivation scores, researchers built “Neighborhood Trajectories,” a new approach to studying structural racism that may help investigate gentrification and “White flight.”

  8. Trends in survival after heart transplantation based on Social Vulnerability Index in the United States

    Azap L, Diaz A, Gouchoe DA, et al. JHLT Open. 2024.

    Among US heart transplant recipients who survived at least 1 year, average or high social vulnerability scores were associated with a higher risk of death over long-term follow-up than low scores.

  9. Association of Hospital Quality and Neighborhood Deprivation With Mortality After Inpatient Surgery Among Medicare Beneficiaries

    Diaz A, Lindau ST, Obeng-Gyasi S, Dimick JB, Scott JW, Ibrahim AM. JAMA Netw Open. 2023.

    For Medicare patients having common inpatient operations, living in a more deprived neighborhood and being treated at a lower-quality hospital were each associated with a higher risk of death within 30 days.

  10. Residential Redlining, Neighborhood Trajectory, and Equity of Breast and Colorectal Cancer Care

    Loehrer AP, Weiss JE, Chatoorgoon KK, …, Diaz A, et al. Ann Surg. 2023.

    In Indiana cities, persistently disadvantaged neighborhoods, compared with persistently advantaged ones, were associated with late-stage breast and colorectal cancer diagnosis; in gentrified neighborhoods, Black patients were less likely than White patients to have cancer surgery.

  11. Association Between Historical Redlining and Access to High-Volume Hospitals Among Patients Undergoing Complex Cancer Surgery in California

    Khalil M, Munir MM, Woldesenbet S, …, Diaz A, et al. Ann Surg Oncol. 2023.

    In California, patients having complex cancer surgery who lived in historically redlined areas were less likely to have it at a high-volume hospital, a gap largely explained by factors such as insurance and minority status.

  12. Association of social determinants of health International Classification of Disease, Tenth Edition clinical modification codes with outcomes for emergency general surgery and trauma admissions

    Diaz A, Azap L, Moazzam Z, Knight-Davis J, Pawlik TM. Surgery. 2023.

    Among California patients with emergency surgical conditions or trauma, few had diagnosis codes recording social or economic hardship; those who did had no more complications or deaths but longer stays and more nursing-facility discharges.

  13. Association of ICD-10 Clinical Modification Codes for Social Determinants of Health with Surgical Outcomes and Hospital Charges Among Cancer Patients

    Diaz A, Pawlik TM. Ann Surg Oncol. 2023.

    Among California patients having surgery for lung, pancreas, colon or rectal cancer, few had diagnosis codes recording social or economic hardship; those who did had longer stays and were more often discharged to nursing facilities.

  14. ASO Author Reflections: International Classification of Diseases Codes for Social Determinants of Health: Still Not Ready for Prime Time

    Diaz A, Pawlik TM. Ann Surg Oncol. 2023. Commentary

  15. Rural Versus Urban Cancer Care: Unpacking the Centralization Dilemma and the Impact of the COVID-19 Pandemic

    Diaz A, Pawlik TM. JCO Oncol Pract. 2023. Editorial

  16. The Association of Persistent Poverty and Outcomes Among Patients Undergoing Cardiac Surgery

    Azap L, Woldesenbet S, Lima HA, …, Diaz A, et al. J Surg Res. 2023.

    Among Medicare patients having heart bypass or valve surgery, those from persistently poor counties were more likely to die in the short and long term than those from counties that never had high poverty.

  17. Social determinants of health and surgical care

    Diaz A, Pawlik TM. Curr Probl Surg. 2023.

  18. Social Vulnerability And Outcomes For Access-Sensitive Surgical Conditions Among Medicare Beneficiaries

    Zhang Y, Kunnath N, Dimick JB, Scott JW, Diaz A, Ibrahim AM. Health Aff (Millwood). 2022.

    Compared with Medicare patients from the least socially vulnerable communities, those from the most vulnerable more often had unplanned surgery for conditions best treated with planned surgery, and higher rates of death and additional surgery.

    More on this study: In vulnerable communities, surgery is more often unplanned

  19. Disparity in Clinical Trial Participation Among Patients with Gastrointestinal Cancer

    Abbas A, Diaz A, Obeng-Gyasi S, et al. J Am Coll Surg. 2022.

    Among US adults who had surgery for digestive-tract cancer, clinical trial participation was low, and Black patients (compared with White patients) and those with Medicare, Medicaid or less education were less likely to enroll.

  20. Understanding Racially Diverse Community Member Views of Obesity Stigma and Bariatric Surgery

    Chao GF, Diaz A, Ghaferi AA, Dimick JB, Byrnes ME. Obes Surg. 2022.

    In interviews with mostly Black community members who qualified for weight-loss surgery but had never considered it, obesity stigma was the main reason for rejecting surgery, which they viewed as an illegitimate shortcut.

  21. Emergency Surgery Rates Among Medicare Beneficiaries With Access Sensitive Surgical Conditions

    Zhang Y, Diaz A, Kunnath N, Dimick JB, Scott JW, Ibrahim AM. J Surg Res. 2022.

    Among Medicare patients having surgery for abdominal aortic aneurysm, colorectal cancer or hernia at an old incision, emergency operations were common, varied almost fivefold across US areas, and were associated with more deaths and readmissions.

  22. Association of Neighborhood Deprivation, Race, and Postoperative Outcomes: Improvement in Neighborhood Deprivation is Associated With Worsening Surgical Disparities

    Diaz A, Valbuena VSM, Dimick JB, Ibrahim AM. Ann Surg. 2022.

    Among White and Black Medicare patients having inpatient surgery, living in a less deprived neighborhood was associated with better outcomes for both groups, but the association was stronger for White patients.

  23. The association of upward economic mobility with textbook outcomes among patients undergoing general and cardiovascular surgery

    Azap L, Azap RA, Hyer JM, Diaz A, Pawlik TM. Am J Surg. 2022.

    Among Medicare patients having heart, blood vessel or abdominal surgery, greater upward economic mobility was associated with better outcomes, and racial differences in death were smaller at the highest mobility level.

  24. Impact of hospital quality on surgical outcomes in patients with high social vulnerability: Association of textbook outcomes and social vulnerability by hospital quality

    Diaz A, Beane JD, Hyer JM, Tsilimigras DI, Pawlik TM. Surgery. 2021.

    For Medicare patients having liver or pancreas surgery, those from the most socially vulnerable counties had higher risks of death and complications than the least vulnerable, but fared considerably better at high- than low-quality hospitals.

  25. Rural hospitals are not associated with worse postoperative outcomes for colon cancer surgery

    Lansing SS, Diaz A, Hyer JM, Tsilimigras DI, Pawlik TM. J Rural Health. 2021.

    For Medicare patients from rural counties having colon cancer surgery, complications, deaths and hospital spending were similar whether they were treated at rural or nonrural hospitals.

  26. Social vulnerability and fragmentation of postoperative surgical care among patients undergoing hepatopancreatic surgery

    Dalmacy DM, Tsilimigras DI, Hyer JM, Paro A, Diaz A, Pawlik TM. Surgery. 2021.

    Among Medicare patients readmitted after liver or pancreas surgery, those with higher social vulnerability were more likely to be readmitted to a different hospital from the one where they had surgery.

  27. ASO Author Reflections: Association of Community Economic Distress and Breast and Colorectal Cancer Screening, Incidence, and Mortality Rates among U.S. Counties

    Herbert C, Paro A, Diaz A, Pawlik TM. Ann Surg Oncol. 2021.

  28. Association of Community Economic Distress and Breast and Colorectal Cancer Screening, Incidence, and Mortality Rates Among US Counties

    Herbert C, Paro A, Diaz A, Pawlik TM. Ann Surg Oncol. 2021.

    Across US counties, greater community economic distress was associated with lower breast and colorectal cancer screening rates and higher death rates from these cancers.

  29. The impact of social vulnerability subthemes on postoperative outcomes differs by racial/ethnic minority status

    Diaz A, Hyer JM, Tsilimigras DI, Pawlik TM. Am J Surg. 2021.

    Among older Medicare patients having surgery, greater social vulnerability, including economic disadvantage and household and disability factors, was associated with lower odds of an ideal recovery, most strongly in minority patients.

  30. Association of Historic Housing Policy, Modern Day Neighborhood Deprivation and Outcomes After Inpatient Hospitalization

    Diaz A, O'Reggio R, Norman M, Thumma JR, Dimick JB, Ibrahim AM. Ann Surg. 2021.

    For Medicare patients having common operations, living in a neighborhood historically “redlined” as “Hazardous” was associated with higher death and complication rates than living in one graded “Best,” even after accounting for present-day neighborhood disadvantage.

  31. Geographic Disparities in Oncologic Treatment and Outcomes: The Urban-Rural Divide

    Diaz A, Pawlik TM. Ann Surg Oncol. 2021. Editorial

  32. Profiles in social vulnerability: The association of social determinants of health with postoperative surgical outcomes

    Paro A, Hyer JM, Diaz A, Tsilimigras DI, Pawlik TM. Surgery. 2021.

    Among Medicare patients having lung, heart, aneurysm or colon surgery, distinct social vulnerability profiles were associated with different outcomes, even among patients with similar overall vulnerability scores, and more vulnerable profiles had worse outcomes.

  33. ASO Author Reflections: County-Level Racial Diversity is Associated with Textbook Outcomes for Pancreatic Surgery

    Diaz A, Pawlik TM. Ann Surg Oncol. 2021. Commentary

  34. Association of County-Level Racial Diversity and Likelihood of a Textbook Outcome Following Pancreas Surgery

    Diaz A, Dalmacy DM, Herbert C, Mirdad RS, Hyer JM, Pawlik TM. Ann Surg Oncol. 2021.

    Medicare patients having pancreas surgery who lived in counties with low racial diversity were less likely to have an ideal recovery, and more likely to be readmitted or die, than those in high-diversity counties.

  35. Disparities in NCCN Guideline Compliant Care for Resectable Cholangiocarcinoma at Minority-Serving Versus Non-Minority-Serving Hospitals

    Tsilimigras DI, Dalmacy DM, Hyer JM, Diaz A, Abbas A, Pawlik TM. Ann Surg Oncol. 2021.

    For patients having bile duct cancer surgery, treatment at hospitals serving the most Black and Hispanic patients was associated with less guideline-recommended care, and missing such care was associated with worse long-term outcomes.

  36. County-level Social Vulnerability is Associated With Worse Surgical Outcomes Especially Among Minority Patients

    Diaz A, Hyer JM, Barmash E, Azap RA, Paredes AZ, Pawlik TM. Ann Surg. 2021.

    Among Medicare patients having colon, heart bypass, lung or joint replacement surgery, those from highly socially vulnerable counties generally had worse outcomes, and this pattern was most pronounced among Black and other minority patients.

  37. Impact of Residential Racial Integration on Postoperative Outcomes Among Medicare Beneficiaries Undergoing Resection for Cancer

    Paro A, Dalmacy DM, Hyer JM, Tsilimigras DI, Diaz A, Pawlik TM. Ann Surg Oncol. 2021.

    For Medicare patients having lung, esophageal, colon or rectal cancer surgery, living in a less racially integrated county was associated with higher odds of complications, longer stays and death, and fewer problem-free recoveries.

  38. Intersection of social vulnerability and residential diversity: Postoperative outcomes following resection of lung and colon cancer

    Diaz A, Dalmacy DM, Hyer JM, Tsilimigras DI, Pawlik TM. J Surg Oncol. 2021.

    For Medicare patients having lung or colon cancer surgery, those from counties with high social vulnerability and low residential diversity were more likely to die within 30 days than those from low-vulnerability, high-diversity counties.

  39. Impact of Race/Ethnicity and County-Level Vulnerability on Receipt of Surgery Among Older Medicare Beneficiaries With the Diagnosis of Early Pancreatic Cancer

    Azap RA, Diaz A, Hyer JM, et al. Ann Surg Oncol. 2021.

    Among older Medicare patients with early-stage pancreatic cancer, those living in more socially vulnerable counties were less likely to have surgery to remove the tumor, especially Black and Latino patients.

  40. ASO Author Reflections: County-Level Social Vulnerability Associated with Disparities in Pancreatic Cancer Treatment, Especially among Patients from Racial and Ethnic Minorities

    Diaz A, Azap RA, Pawlik TM. Ann Surg Oncol. 2021.

  41. Patient Social Vulnerability and Hospital Community Racial/Ethnic Integration: Do All Patients Undergoing Pancreatectomy Receive the Same Care Across Hospitals?

    Hyer JM, Tsilimigras DI, Diaz A, Dalmacy DM, Paro A, Pawlik TM. Ann Surg. 2021.

    For Medicare patients having pancreas surgery, those from highly socially vulnerable counties treated at hospitals in less racially and ethnically integrated communities had the lowest chance of a problem-free recovery.

  42. Geospatial Inefficiencies Associated With Digital Replantations at High-Volume Centers and Optimal Allocation Model for Centralization of Replantations

    O'Brien AL, Diaz A, Jefferson RC, Pawlik TM, Moore AM. J Hand Surg Am. 2021.

    For Californians with amputated fingers, few hospitals performed many reattachment surgeries, travel was a barrier to reaching them, and a model shifting cases to selected centers raised volumes and shortened travel times.

  43. Association of social vulnerability with the use of high-volume and Magnet recognition hospitals for hepatopancreatic cancer surgery

    Diaz A, Hyer JM, Azap RA, Tsilimigras DI, Pawlik TM. Surgery. 2021.

    Among Medicare patients having cancer surgery on the liver or pancreas, those from more socially vulnerable counties were less likely to have surgery at high-volume hospitals, where their higher complication risk appeared partly reduced.

  44. High Social Vulnerability and "Textbook Outcomes" after Cancer Operation

    Hyer JM, Tsilimigras DI, Diaz A, et al. J Am Coll Surg. 2021.

    Among Medicare patients having lung, esophageal, colon or rectal cancer surgery, only about half had a problem-free recovery, and those from socially vulnerable areas, especially non-White patients, were less likely to have one.

  45. Association of County-Level Vulnerability, Patient-Level Race/Ethnicity, and Receipt of Surgery for Early-Stage Hepatocellular Carcinoma

    Azap RA, Hyer JM, Diaz A, Paredes AZ, Pawlik TM. JAMA Surg. 2021.

    For patients with early-stage liver cancer, this study examined how county social vulnerability and patient race and ethnicity, alone and together, related to the chance of having surgery or a transplant.

  46. Trends in the Geospatial Distribution of Inpatient Adult Surgical Services across the United States

    Diaz A, Schoenbrunner AR, Pawlik TM. Ann Surg. 2021.

    Across the United States between 2005 and 2015, rural hospitals offering surgery declined while major surgical hospitals increased, and the number of people living more than a 60-minute drive from a surgical hospital nearly doubled.

  47. Rural Surgery and Status of the Rural Workplace: Hospital Survival and Economics

    Diaz A, Pawlik TM. Surg Clin North Am. 2020. Review

    This review concludes that surgery can be safely performed in rural hospitals, but that rural hospital closures, which seem to be accelerating, may put rural residents at greater risk from surgical conditions.

  48. Examining healthcare inequities relative to United States safety net hospitals

    Paredes AZ, Hyer JM, Diaz A, Tsilimigras DI, Pawlik TM. Am J Surg. 2020.

    For adults having heart bypass, colon surgery or hip replacement, patients at hospitals with the heaviest safety-net burden had worse outcomes, and racial minority patients had more complications than White patients regardless of safety-net burden.

  49. Trends in the Geospatial Distribution of Adult Inpatient Surgical Cancer Care Across the United States

    Diaz A, Schoenbrunner AR, Pawlik TM. J Gastrointest Surg. 2020.

    Across the United States from 2005 to 2015, the number of people living more than a 60-minute drive from a hospital with an approved cancer program nearly doubled, and their communities were poorer.

  50. Travel Patterns among Patients Undergoing Hepatic Resection in California: Does Driving Further for Care Improve Outcomes?

    Diaz A, Cloyd JM, Manilchuk A, et al. J Gastrointest Surg. 2020.

    In California, most liver surgery patients bypassed their nearest hospital, usually for a high-volume one, but about one-quarter had surgery at low-volume hospitals, and Medicaid patients were less likely to be treated at high-volume hospitals.

  51. Association of County-Level Social Vulnerability with Elective Versus Non-elective Colorectal Surgery

    Diaz A, Barmash E, Azap RA, Paredes AZ, Hyer JM, Pawlik TM. J Gastrointest Surg. 2020.

    Among Medicare patients having colon surgery for diverticulitis or colon cancer, those from more socially vulnerable counties were more likely to have an emergency rather than planned operation and had higher complication risk.

  52. Association of Neighborhood Characteristics with Utilization of High-Volume Hospitals Among Patients Undergoing High-Risk Cancer Surgery

    Diaz A, Chavarin D, Paredes AZ, Tsilimigras DI, Pawlik TM. Ann Surg Oncol. 2020.

    In California, patients having high-risk cancer surgery on the esophagus, lung, pancreas or rectum who lived in highly socially vulnerable counties were less likely to have their operation at a high-volume hospital.

  53. Sex-based differences in time to surgical care among pancreatic cancer patients: A national study of Medicare beneficiaries

    Azap RA, Hyer JM, Diaz A, Tsilimigras DI, Mirdad RS, Pawlik TM. J Surg Oncol. 2020.

    Among Medicare patients who had surgery for pancreatic cancer, women and older patients waited longer from first symptoms to diagnosis, and women also waited longer from diagnosis to surgery.

  54. ASO Author Reflections: Centralization of High-Risk Cancer Surgery and Implications for Vulnerable Communities

    Diaz A, Pawlik TM. Ann Surg Oncol. 2020.

  55. The association of neighborhood social vulnerability with surgical textbook outcomes among patients undergoing hepatopancreatic surgery

    Azap RA, Paredes AZ, Diaz A, Hyer JM, Pawlik TM. Surgery. 2020.

    Among Medicare patients having liver or pancreas surgery, one-half had an ideal recovery free of complications, long stays, and 90-day readmission or death; higher social vulnerability was associated with lower chances of achieving it.

  56. Regionalization of Pancreatectomy for Pancreatic Cancer-Reply

    Diaz A, Pawlik TM. JAMA Surg. 2020. Letter

  57. Optimal Location for Centralization of Hospitals Performing Pancreas Resection in California

    Diaz A, Pawlik TM. JAMA Surg. 2020. Letter

    This study examines where in California hospitals performing a major pancreas operation could best be located if the operation were concentrated at fewer hospitals.

  58. Accessing surgical care for esophageal cancer: patient travel patterns to reach higher volume center

    Diaz A, Burns S, D'Souza D, et al. Dis Esophagus. 2020.

    In California, most patients having surgery for esophageal cancer bypassed their nearest hospital, yet most of them did not go to a high-volume hospital, and nearly two-thirds of patients had surgery at a low-volume hospital.

  59. Accessing surgical care for pancreaticoduodenectomy: Patient variation in travel distance and choice to bypass hospitals to reach higher volume centers

    Diaz A, Burns S, Paredes AZ, Pawlik TM. J Surg Oncol. 2019.

    In California, most patients having surgery for pancreatic cancer bypassed their nearest hospital for a higher-volume one, and surgery at high-volume hospitals was associated with lower mortality, yet nearly 1 in 5 used low-volume hospitals.

  60. Geographic Distribution of Adult Inpatient Surgery Capability in the USA

    Diaz A, Schoenbrunner AR, Cloyd JM, Pawlik TM. J Gastrointest Surg. 2019.

    Across the United States, a sizable share of people live more than 30 straight-line miles from a major surgical hospital, and proximity to surgical hospitals varied with demographic and socioeconomic factors, suggesting disparities in access.

  61. Association between operating room access and mortality for life-threatening general surgery emergencies

    Daniel VT, Rushing AP, Ingraham AM, …, Diaz A, et al. J Trauma Acute Care Surg. 2019.

    Among adults in 17 states operated on the day of admission for life-threatening general surgery emergencies, having emergency general surgeons and recovery room nurses on site around the clock was associated with fewer deaths.

  62. Surgical Procedures in Health Professional Shortage Areas: Impact of a Surgical Incentive Payment Plan

    Diaz A, Merath K, Bagante F, et al. Surgery. 2018.

    In California, the Affordable Care Act’s bonus payment for general surgeons in health professional shortage areas was associated with more surgeries at the two shortage-area hospitals relative to other hospitals, reversing a downward trend.