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A single case report integrated with bibliometric review and exploratory bioinformatic analysis of gene expression datasets; no clinical trial, no new diagnostic or therapeutic validation, and no quantitative evidence of intervention efficacy beyond one patient's response.
A single case report with clinical narrative describing an unusual metastatic pattern; it raises mechanistic hypotheses and clinical management questions but provides no comparative data, control group, or generalizable evidence.
Single-centre retrospective cohort with small advanced-stage subgroups (n=16 per arm) and exploratory analyses; unadjusted PFS benefit for ICIs did not survive adjustment, and authors explicitly state findings are hypothesis-generating rather than confirmatory.
A single clinical case report describing an unusual diagnostic presentation; raises awareness of a rare mimicry but provides no generalizable evidence about incidence, diagnosis, or management.
Small single-center retrospective cohort (n=22) with univariate analysis only, addressing a rare disease with no established standard, yielding a promising survival signal but explicitly requiring large prospective validation.
Single case report documenting an unusual metastatic pattern and therapeutic response; raises mechanistic questions about lymphatic spread and HER2 conversion but lacks comparative data or generalizable evidence.
Single case report with diagnostic and treatment lessons, but no comparative data, controlled intervention, or outcome metrics that permit evidence-grading of efficacy.
A single-center retrospective cohort study shows higher pathological response and 3-year OS with PD-1 inhibitor plus chemotherapy versus chemotherapy alone in gastric cancer with para-aortic node metastasis, but lacks randomization, prospective design, and multicenter validation.