| evidence-kf1 | The report describes 23 patients with pathologically confirmed esophageal gastrointestinal stromal tumors at one hospital. | Retrospective clinical records from the First Affiliated Hospital of Zhengzhou University. The total and sex counts agree across the abstract and Table 1; the exact 2023 enrollment cutoff differs between Methods and Results and is not resolved here. | patients: 23; male / female: 12 / 11; mean age ± SD: 56.7 ± 12.0 years | Observational treatment-pattern, adverse-event and follow-up evidence | Selected retrospective clinical experience; no comparative treatment-effect inference. | Publisher-layout PDF p. 1, Abstract; p. 2, Methods 2.1; p. 3, Results 3.1 and Table 1. | KF1 |
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| evidence-kf2 | Treatment allocation comprised 15 endoscopic resections, five direct operations, two operations after neoadjuvant imatinib, and one conservatively managed patient. | These four groups partition the same 23-patient series. The seven surgical patients in Table 3 include the five direct operations and two after neoadjuvant treatment; they are not an additional cohort. Treatment was selected by clinicians using tumor characteristics, not randomized. | endoscopic resection: 15; direct surgery: 5; neoadjuvant imatinib then surgery: 2; conservative treatment: 1 | Observational treatment-pattern, adverse-event and follow-up evidence | Selected retrospective clinical experience; no comparative treatment-effect inference. | Publisher-layout PDF p. 2, Methods 2.3; pp. 3–4, Results 3.2; p. 4, Table 2 and Table 3 headings. | KF2 |
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| evidence-kf3 | Endoscopic management used three techniques, and 12 of the 15 endoscopically treated tumors were reported as no larger than 30 mm. | The series documents selected procedures and lesion sizes. It does not establish a universal treatment-size threshold or comparative oncologic equivalence to surgery. | STER: 9/15; ESD: 4/15; EMBL: 2/15; endoscopic tumors ≤30 mm: 12/15 | Observational treatment-pattern, adverse-event and follow-up evidence | Selected retrospective clinical experience; no comparative treatment-effect inference. | Publisher-layout PDF p. 4, Table 2; Results 3.3 and Table 3; p. 5, Discussion on selection and procedural limitations. | KF3 |
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| evidence-kf4 | The endoscopic group had two reported postoperative adverse events: one episode of paroxysmal palpitations and one of fever. | The denominator is the 15 endoscopically treated patients. The article describes management of both events, but this small, selected retrospective group cannot establish lower treatment risk than surgery. | paroxysmal palpitations: 1/15; fever: 1/15 | Observational treatment-pattern, adverse-event and follow-up evidence | Selected retrospective clinical experience; no comparative treatment-effect inference. | Publisher-layout PDF p. 4, Results 3.3 and Table 3; p. 5, Discussion paragraph on postoperative events. | KF4 |
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| evidence-kf5 | The article reports mean follow-up of 48.2 months and documents one patient with postoperative recurrence at 15 months and death at 29 months. | The follow-up mean covers the reported series. The recurrence and death times describe patient No. 16, not a model-derived survival estimate. A separate account of patient No. 21 concerns a previous, incompletely documented procedure; it is not combined into a new recurrence-rate calculation. | mean follow-up ± SD: 48.2 ± 24.2 months; patient No. 16 recurrence: 15 months after surgery; patient No. 16 death: 29 months after surgery | Observational treatment-pattern, adverse-event and follow-up evidence | Selected retrospective clinical experience; no comparative treatment-effect inference. | Publisher-layout PDF p. 4, Results 3.2 and Table 2; p. 5, Discussion paragraphs describing patients No. 16 and No. 21. | KF5 |
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