{
  "abstract": "Importance: Molecular evaluation is standard of care for patients with advanced non–small cell lung cancer (NSCLC) in the US. Patients in rural areas face disproportionate lung cancer mortality associated with reduced guideline-concordant evaluation and treatment receipt, but molecular testing patterns have not been described in this population.\n\nObjective: To characterize molecular testing patterns in the rural US following initial testing implementation.\n\nDesign, Setting, and Participants: This cohort study used the Surveillance, Epidemiology, and End Results Program linked to Medicare claims data to identify individuals aged 66 years or older diagnosed with advanced NSCLC from January 2014 to December 2019. Data analysis was performed from December 2025 to August 2026.\n\nExposures: Sociodemographic variables, histology, and practitioner visits.\n\nMain Outcomes and Measures: The primary outcome was receipt of molecular testing. The cumulative incidence of testing overall and by patient subgroups defined at baseline were calculated using the total person-time at risk (30 days before diagnosis to death or 6 months after diagnosis) using a competing-risks framework, with death as the competing event.\n\nResults: Among a total of 8259 Medicare beneficiaries residing in rural areas who were diagnosed with advanced NSCLC included in the study (mean [SD] age, 76.1 [6.7] years; 4672 males [56.6%]), 1775 (21.5%) were eligible for Medicaid, 3754 (45.5%) had adenocarcinoma histology, 2044 (24.7%) had squamous histology, and 2461 (29.8%) had other or unspecified histology. In the cohort, 2963 (35.9%) received molecular testing. The cumulative incidence of testing by 180 days after diagnosis was 0.36 (95% CI, 0.35-0.37). Increasing age (hazard ratio [HR], 0.96 [95% CI, 0.93-0.99]), later diagnosis year (HR, 1.05 [95% CI, 1.02-1.07]), dual Medicaid coverage (HR, 0.71 [95% CI, 0.64-0.79]), Part D enrollment (HR, 1.13 [95% CI, 1.04-1.22]), and squamous histology (HR, 0.35 [95% CI, 0.32-0.39]) were independently associated with testing. A greater percentage of patients who received testing had visits with both a proceduralist or a surgeon and an oncologist compared with those without testing (1257 [77.7%] vs 867 [58.9%]; P < .001).\n\nConclusions and Relevance: In this cohort study of Medicare beneficiaries with advanced NSCLC residing in the rural US, initial receipt of molecular testing was low. Dual Medicaid coverage, Part D enrollment, and subspecialist visits were independently associated with test receipt, highlighting key areas for future study to promote equitable delivery of guideline-concordant lung cancer care.",
  "abstract_shown": true,
  "affiliations": [
    "Department of Oncology, The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins University, Baltimore, Maryland",
    "School of Medicine, Johns Hopkins University, Baltimore, Maryland",
    "Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland",
    "Johns Hopkins School of Nursing, Johns Hopkins University, Baltimore, Maryland"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "Dena P. Rhinehart"
    },
    {
      "affs": [
        1
      ],
      "name": "Evelien van Gelderen"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Josephine Feliciano"
    },
    {
      "affs": [
        0,
        1,
        2,
        3
      ],
      "name": "Craig Evan Pollack"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Kristen A. Marrone"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Amanda L. Blackford"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a5xdxq5fs1scv.bib",
  "cited_by": 0,
  "doi": "10.1001/jamanetworkopen.2026.42270",
  "fulltext_url": null,
  "id": "a5xdxq5fs1scv",
  "issns": [
    "2574-3805"
  ],
  "landing_url": "https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2856260",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [],
  "openalex": null,
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": "American Medical Association (AMA)",
  "ris": "https://research.draconitic.com/paper/a5xdxq5fs1scv.ris",
  "sources": [
    {
      "first_seen": "2026-11-06T00:21:22Z",
      "native_id": "10.1001/jamanetworkopen.2026.42270",
      "source": "crossref",
      "url": "https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2856260"
    }
  ],
  "subjects": [
    {
      "field": "medicine",
      "origin": "issn:2574-3805",
      "subfield": "general"
    }
  ],
  "title": "Molecular Testing Among Patients With Advanced Non–Small Cell Lung Cancer in the Rural US",
  "title_text": "Molecular Testing Among Patients With Advanced Non–Small Cell Lung Cancer in the Rural US",
  "type": "peer-reviewed",
  "updated_at": "2026-11-07T00:21:20Z",
  "url": "https://research.draconitic.com/paper/a5xdxq5fs1scv",
  "venue": "JAMA Network Open",
  "versions": []
}