{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T13:09:25Z","timestamp":1788786565160,"version":"build-2803163510"},"reference-count":93,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T00:00:00Z","timestamp":1788393600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"crossref","award":["82472799"],"award-info":[{"award-number":["82472799"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"}]},{"award":["82472799"],"award-info":[{"award-number":["82472799"]}],"id":[{"id":"https:\/\/ror.org\/01h0zpd94","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Cells"],"abstract":"<jats:p>CD97 is an adhesion G-protein-coupled receptor encoded by ADGRE5 that integrates extracellular signals (including cell adhesion, ligand binding, and mechanical stimulation) with intracellular signal transduction. Recent structural studies have further elucidated tethered\/intramolecular agonist (TIA)\/Stachel recognition and engagement of the seven-transmembrane domain (7TMD), activation-associated 7TMD conformational changes, and G-protein coupling, including the structural basis for the preferential coupling of CD97 to G13. Currently, antibody\u2013drug conjugates (ADCs) targeting CD97 are supported by in vitro proof-of-concept evidence, whereas chimeric antigen receptor (CAR) strategies have shown antitumor activity in animal models of glioblastoma (GBM) and acute myeloid leukemia (AML). Existing research indicates that CD97 is involved in maintaining stem-like states, invasion and metastasis, metabolic adaptation, and stress survival in certain tumors, and its function varies depending on tumor type and cellular environment. Because CD97 is also expressed in normal immune cells and various nonhematopoietic tissues, systemic targeted therapy may be limited by on-target\/off-tumor toxicity. This article reviews the latest advances in CD97 structure and signal transduction, and explores its tumor-related functions, biomarker value, evidence for ADC and CAR-related therapies, as well as early exploratory directions involving RNA-mediated downregulation and structure-guided interventions.<\/jats:p>","DOI":"10.3390\/cells15171605","type":"journal-article","created":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T11:08:53Z","timestamp":1788433733000},"page":"1605","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["CD97\/ADGRE5 in Cancer: Structural Activation, Context-Dependent Signaling, and Therapeutic Targeting"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1414-0595","authenticated-orcid":false,"given":"Yuhong","family":"Lei","sequence":"first","affiliation":[{"name":"The First Bethune Hospital of Jilin University, Changchun 130021, China"},{"name":"Institute of Cancer, Jilin University, Changchun 130021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuan","family":"Zhang","sequence":"additional","affiliation":[{"name":"Medical Publishing Center, The First Bethune Hospital of Jilin University, Changchun 130021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yufeng","family":"Wang","sequence":"additional","affiliation":[{"name":"The First Bethune Hospital of Jilin University, Changchun 130021, China"},{"name":"Institute of Cancer, Jilin University, Changchun 130021, China"},{"name":"International Center of Future Science, Jilin University, Changchun 130021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9920-6508","authenticated-orcid":false,"given":"Lingyu","family":"Li","sequence":"additional","affiliation":[{"name":"The First Bethune Hospital of Jilin University, Changchun 130021, China"},{"name":"Institute of Cancer, Jilin University, Changchun 130021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,3]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"374","DOI":"10.1016\/j.ccell.2023.02.016","article-title":"The evolving tumor microenvironment: From cancer initiation to metastatic outgrowth","volume":"41","author":"Joyce","year":"2023","journal-title":"Cancer Cell"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"153","DOI":"10.1038\/s41392-021-00544-0","article-title":"Extracellular matrix and its therapeutic potential for cancer treatment","volume":"6","author":"Huang","year":"2021","journal-title":"Signal Transduct. 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