Tumor-associated calcium signal transducer 2 (TACSTD2)
tumor-associated calcium signal transducer 2 (TROP2), encoded by the TACSTD2 gene and also known as trophoblast cell-surface antigen 2 (Trop-2), is a type I transmembrane glycoprotein that was originally identified on trophoblast cells of the placenta.
tumor-associated calcium signal transducer 2 (TROP2), encoded by the TACSTD2 gene and also known as trophoblast cell-surface antigen 2 (Trop-2), is a type I transmembrane glycoprotein that was originally identified on trophoblast cells of the placenta. It functions as a calcium signal transducer and is implicated in the regulation of cell proliferation, survival, and adhesion. Under normal physiological conditions, TROP2 expression is restricted to a limited set of epithelial tissues; however, it is broadly and frequently overexpressed across a wide range of solid tumors, including non-small cell lung cancer (NSCLC), small cell lung cancer (SCLC), pancreatic cancer, and breast, gastric, and urothelial carcinomas. This tumor-enriched expression pattern, combined with its extracellular accessibility as a membrane-bound antigen, makes TROP2 a highly attractive therapeutic target.
The protein's association with cancer invasiveness and poorer patient outcomes has driven extensive efforts to exploit it as an antibody-drug conjugate (ADC) target. Several TROP2-directed ADCs have advanced through clinical development, with at least one receiving regulatory approval from both the Food and Drug Administration (FDA) and China's National Medical Products Administration (NMPA) for use in patients with EGFR-mutated locally advanced or metastatic NSCLC whose disease has progressed after EGFR-directed therapy and platinum-based chemotherapy. Beyond ADCs, TROP2 is now being explored in radioimmunotherapy, bispecific antibody formats, and proteolysis-targeting chimera (PROTAC)-based platforms, reflecting its versatility as an oncological target.
Where the papers sit
17 papers from the last 6 months study Tumor-associated calcium signal transducer 2 (TACSTD2) directly · updated from PubMed 5 Oct 2026
Study type 3 clinical trials · 4 observational · 2 human data · 6 preclinical · 2 unclassified
Themes 3 themes · 1 paradigm shift
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TROP2 ADC Therapy
TROP2-directed antibody-drug conjugates are moving from single-agent use toward better safety management, dynamic monitoring and combination therapy. Sacituzumab govitecan, sacituzumab tirumotecan and datopotamab deruxtecan recur across breast-cancer studies, especially pretreated and triple-negative disease. Pembrolizumab combinations and circulating-tumor-cell tracking seek to extend progression-free benefit and identify response. TROP2 expression and H-scores remain clinically relevant, but efficacy and tolerability across tumor types remain open questions.
9 papers · 52.9%
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TROP2 in Lung Cancer
TROP2-directed therapy is moving into advanced non-small-cell lung cancer, including sacituzumab tirumotecan with pembrolizumab. The work also targets drug-tolerant persister cells as a route to delay osimertinib and other EGFR tyrosine kinase inhibitor resistance. TROP2 expression is examined across conventional and transformed small-cell lung carcinomas, with MYC-associated transformation providing a recurring biological context. Whether ADCs can improve outcomes across EGFR-driven and small-cell-transformed disease remains unresolved.
3 papers · 17.6%
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Others — Cancer Targeting and Biomarkers
KRAS-MAPK inhibition is being linked to interferon signaling, cell-state transitions and new therapeutic vulnerabilities. TCR-JANUS engagers and tumor-targeted bispecifics aim to improve T-cell targeting across heterogeneous tumors while limiting toxicity. Proteomic studies instead pursue biomarker discovery, including extracellular-vesicle predictors of 177Lu-PSMA-617 outcomes. The cluster therefore spans immunotherapy, resistance biology and proteomics without a single shared direction.
5 papers · 29.4%
TROP2 becomes an induced vulnerability of treatment-tolerant cancer states rather than merely a pre-existing tumor marker
In EGFR-mutant non-small-cell lung cancer treated with osimertinib and in pancreatic ductal adenocarcinoma treated with KRAS–MAPK inhibitors, the respective drug-tolerant or EMT-like resistant states instead upregulated TROP2 and became susceptible to TROP2-directed antibody-drug conjugates 42314664Jun 42008116Apr. This independently observed pattern changes the therapeutic logic: pathway inhibition can create, rather than simply reveal, a TROP2-dependent residual population, supporting an “induce-target-kill” strategy in which TROP2 ADCs are combined with the initial targeted therapy to delay relapse.
Papers
The 17 papers from the last 6 months that study Tumor-associated calcium signal transducer 2 (TACSTD2) directly, newest first, by theme and by study type. Study types come from PubMed publication types and MeSH headings.
By theme
TROP2 ADC Therapy (9)
- Safety management of anti TROP2 ADCs in patients with breast cancer. Current opinion in oncology · 18 Sept 2026 PMID 42757501
- Exploring trop-2-directed ADCs monotherapy and combination therapy in pretreated mTNBC: a real-world study. Breast cancer research and treatment · 9 Sept 2026 PMID 42714605
- TROP2 Expression in Bladder Transurethral Resection Specimens: Correlation With Histological Grade and Survival. In vivo (Athens, Greece) · 28 Aug 2026 PMID 42665429
- TroFuse-011 study design: sacituzumab tirumotecan with or without pembrolizumab for advanced triple-negative breast cancer with PD-L1 CPS <10. Future oncology (London, England) · 31 Jul 2026 PMID 42535874
- The human trophoblast cell-surface antigen 2 (TROP-2) expression on metastasized breast cancer. Journal of cancer research and clinical oncology · 17 Jul 2026 PMID 42467304
- Engineering Cathepsin S Selective Chemical Probes and Antibody-Drug Conjugates through Substrate Profiling with Unnatural Amino Acids. Journal of medicinal chemistry · 1 Jul 2026 PMID 42381118
- Targeting drug-tolerant persister cells: Let's bring on the TROPs! Cancer cell · 18 Jun 2026 PMID 42314666
- Dynamic monitoring of antibody drug conjugates targeting TROP2 or HER2 in breast cancer using circulating tumor cells. Proceedings of the National Academy of Sciences of the United States of America · 17 Jun 2026 PMID 42308036
- A Phase II Evaluation of the Efficacy and Safety of Sacituzumab Govitecan in Patients with Recurrent Uterine Cancer. Clinical cancer research : an official journal of the American Association for Cancer Research · 14 May 2026 PMID 42132892
TROP2 in Lung Cancer (3)
- Targeting TROP2 in drug-tolerant persister cells delays EGFR tyrosine kinase inhibitor resistance in non-small-cell lung cancer. Cancer cell · 18 Jun 2026 PMID 42314664
- Sacituzumab tirumotecan plus pembrolizumab versus pembrolizumab in PD-L1-positive advanced non-small-cell lung cancer (OptiTROP-Lung05): interim analysis of a randomised, open-label, phase 3 trial. Lancet (London, England) · 29 May 2026 PMID 42214392
- Comparative analysis of therapeutic target protein expression in de novo and transformed small cell lung carcinomas using paired biopsy samples. Lung cancer (Amsterdam, Netherlands) · 21 Apr 2026 PMID 42013561
Others — Cancer Targeting and Biomarkers (5)
- TCR-JANUS engager proteins enable bispecific targeting to overcome tumor heterogeneity in TCR-T cell therapy. Science advances · 9 Sept 2026 PMID 42715334
- Bimodality in pan-cancer proteomics reveals new opportunities for biomarker discovery. Genome biology · 10 Jul 2026 PMID 42426806
- Tumor-targeted bispecific antibodies effectively inhibit oncogenic pathways while minimizing toxicity. Science advances · 22 May 2026 PMID 42172336
- Plasma extracellular vesicle proteomics nominates candidate biomarkers of 177Lu-PSMA-617 outcomes in metastatic prostate cancer patients. Cell reports. Medicine · 21 Apr 2026 PMID 42013849
- Prolonged KRAS-MAPK Inhibition Induces Interferon Signaling That Promotes Cell State Transition and Confers Therapeutic Vulnerabilities. Cancer research · 20 Apr 2026 PMID 42008116
By study type
Clinical trials (3)
- TroFuse-011 study design: sacituzumab tirumotecan with or without pembrolizumab for advanced triple-negative breast cancer with PD-L1 CPS <10. Future oncology (London, England) · 31 Jul 2026 PMID 42535874
- Sacituzumab tirumotecan plus pembrolizumab versus pembrolizumab in PD-L1-positive advanced non-small-cell lung cancer (OptiTROP-Lung05): interim analysis of a randomised, open-label, phase 3 trial. Lancet (London, England) · 29 May 2026 PMID 42214392
- A Phase II Evaluation of the Efficacy and Safety of Sacituzumab Govitecan in Patients with Recurrent Uterine Cancer. Clinical cancer research : an official journal of the American Association for Cancer Research · 14 May 2026 PMID 42132892
Observational studies and case reports (4)
- Exploring trop-2-directed ADCs monotherapy and combination therapy in pretreated mTNBC: a real-world study. Breast cancer research and treatment · 9 Sept 2026 PMID 42714605
- Dynamic monitoring of antibody drug conjugates targeting TROP2 or HER2 in breast cancer using circulating tumor cells. Proceedings of the National Academy of Sciences of the United States of America · 17 Jun 2026 PMID 42308036
- Plasma extracellular vesicle proteomics nominates candidate biomarkers of 177Lu-PSMA-617 outcomes in metastatic prostate cancer patients. Cell reports. Medicine · 21 Apr 2026 PMID 42013849
- Comparative analysis of therapeutic target protein expression in de novo and transformed small cell lung carcinomas using paired biopsy samples. Lung cancer (Amsterdam, Netherlands) · 21 Apr 2026 PMID 42013561
Human data, design not indexed (2)
- TROP2 Expression in Bladder Transurethral Resection Specimens: Correlation With Histological Grade and Survival. In vivo (Athens, Greece) · 28 Aug 2026 PMID 42665429
- The human trophoblast cell-surface antigen 2 (TROP-2) expression on metastasized breast cancer. Journal of cancer research and clinical oncology · 17 Jul 2026 PMID 42467304
Preclinical: animal, cell and lab studies (6)
- TCR-JANUS engager proteins enable bispecific targeting to overcome tumor heterogeneity in TCR-T cell therapy. Science advances · 9 Sept 2026 PMID 42715334
- Engineering Cathepsin S Selective Chemical Probes and Antibody-Drug Conjugates through Substrate Profiling with Unnatural Amino Acids. Journal of medicinal chemistry · 1 Jul 2026 PMID 42381118
- Targeting drug-tolerant persister cells: Let's bring on the TROPs! Cancer cell · 18 Jun 2026 PMID 42314666
- Targeting TROP2 in drug-tolerant persister cells delays EGFR tyrosine kinase inhibitor resistance in non-small-cell lung cancer. Cancer cell · 18 Jun 2026 PMID 42314664
- Tumor-targeted bispecific antibodies effectively inhibit oncogenic pathways while minimizing toxicity. Science advances · 22 May 2026 PMID 42172336
- Prolonged KRAS-MAPK Inhibition Induces Interferon Signaling That Promotes Cell State Transition and Confers Therapeutic Vulnerabilities. Cancer research · 20 Apr 2026 PMID 42008116
Unclassified: not yet indexed with MeSH (2)
- Safety management of anti TROP2 ADCs in patients with breast cancer. Current opinion in oncology · 18 Sept 2026 PMID 42757501
- Bimodality in pan-cancer proteomics reveals new opportunities for biomarker discovery. Genome biology · 10 Jul 2026 PMID 42426806
Written from 17 PubMed abstracts, each one listed by PMID above. Published: 2026-06-15. Last written: 2026-09-20 by GPT. Corrections: 2026-09-26 by GPT. Drafted by language models from published abstracts; not medical advice.