Case Report: A rare case of primary undifferentiated pleomorphic sarcoma of the renal pelvis with high PD-L1 expression and a misleading positive urine FISH.

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Title: Case Report: A rare case of primary undifferentiated pleomorphic sarcoma of the renal pelvis with high PD-L1 expression and a misleading positive urine FISH.
Authors: Li J; Department of Pathology, Qilu Hospital of Shandong University, Jinan, Shandong, China., Wang X; Department of Pathology, School of Basic Medical Sciences, Shandong University, Jinan, Shandong, China., Zhen J; Department of Pathology, Qilu Hospital of Shandong University, Jinan, Shandong, China.; Department of Pathology, School of Basic Medical Sciences, Shandong University, Jinan, Shandong, China., Qi M; Department of Pathology, Qilu Hospital of Shandong University, Jinan, Shandong, China.
Source: Frontiers in immunology [Front Immunol] 2026 Mar 03; Vol. 17, pp. 1769769. Date of Electronic Publication: 2026 Mar 03 (Print Publication: 2026).
Publication Type: Case Reports; Journal Article
Journal Info: Publisher: Frontiers Research Foundation] Country of Publication: Switzerland NLM ID: 101560960 Publication Model: eCollection Cited Medium: Internet ISSN: 1664-3224 (Electronic) Linking ISSN: 16643224 NLM ISO Abbreviation: Front Immunol Subsets: MEDLINE
Database: MEDLINE Ultimate
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ISSN:1664-3224
DOI:10.3389/fimmu.2026.1769769