Of these agents, Telomelysin (OBP-301, Suratadenoturev), a telomerase-specific oncolytic adenovirus, demonstrated clinical safety but limited efficacy in refractory tumors. Given its multifaceted antitumor functions and ability to overcome key barriers in pancreatic cancer, OBP-702 represents a highly promising therapeutic candidate. A first-in-human clinical trial evaluating endoscopic ultrasonography-guided intratumoral injection of OBP-702 is currently in preparation, expected to advance clinical translation of this novel virotherapeutic strategy.

Despite the recent regulatory approvals of oncolytic viruses such as T-VEC (JS1/34.5-/47-/GM-CSF), Oncorine (H101), and Teserpaturev (G47Δ), the clinical impact of OV remains limited by its reliance on intratumoral administration. Preclinical studies demonstrate that FusOn-SD efficiently reaches tumor sites following systemic administration, exhibiting enhanced immune evasion and oncolytic potency. These findings position FusOn-SD as a promising candidate for advancing OV beyond localized injections, with the potential to transform virotherapy into a viable treatment for metastatic cancer.

P2, N=20, Not yet recruiting, West China Hospital

Small-molecule correctors, statins, Hsp90 inhibitors, and new drugs like Eprenetapopt and COTI-2 are among the therapeutic options proposed. Challenges such as medication resistance, side effects, and the chemical complexity of p53 pathways are also addressed, emphasizing the importance of ongoing research. This review contributes to our understanding of TP53-targeted cancer medicines, offering hope for more innovative treatments with improved outcomes.

P1, N=11, Active, not recruiting, City of Hope Medical Center | Trial completion date: Oct 2025 --> Oct 2026

Our results suggest that P53-armed OBP-702 is a promising agent for improving the antitumor effect of PD1 blockade in treating invasive OS.

These findings were supported by in vivo experiments using CT26 subcutaneous, bilateral, and orthotopic tumor models, in which the combination of oral butyrate and intratumoral OBP-702 administration produced synergistic antitumor effects. These results highlight the therapeutic potential of integrating gut microbial metabolites with oncolytic virotherapy as a novel immunotherapeutic strategy for colorectal cancer.

Subsequently, the patient was treated with an innovative regimen consisting of endoscopic intratumoral injections of Oncolytic adenovirus H101 in combination with the PD-1 inhibitor tislelizumab...The patient achieved nearly 4 months of progression-free survival and a substantial improvement in quality of life. This case highlights the potential of combining oncolytic virotherapy with PD-1 inhibition as a promising and novel personalized strategy for treating elderly patients with advanced gastrointestinal cancers who are unsuitable candidates for conventional therapies.

P=N/A, N=20, Not yet recruiting, Renji Hospital ,Shanghai Jiaotong University School Of Medicine; Renji Hospital ,Shanghai Jiaotong University School Of Medicine

P2, N=38, Not yet recruiting, The First Affiliated Hospital of Guangzhou Medical University

Cells expressing ABCC1 displayed significant resistance to thiosemicarbazones (Dp44mT, COTI-2, DpC) in both their metal-free and metal-bound forms. Vesicular transport assays further demonstrated that ABCC1 actively transports the Fe-GSH complex, formed under physiological glutathione levels, indicating its role in regulating the labile iron pool and reducing intracellular iron toxicity. These findings underscore the importance of transporter-chelator interactions in shaping drug resistance and sensitivity and highlight the intricate roles of ABC transporters in modulating chelator activity.

P2, N=30, Not yet recruiting, Fudan University | Trial primary completion date: Jan 2026 --> Jan 2028