NXP800

Key developments include next-generation AR pathway inhibitors, such as darolutamide, with improved safety profiles; PARP inhibitors for patients with DNA repair gene mutations; and PSMA-targeted radioligand therapy. The therapeutic landscape is also expanding to include novel targets such as the heat shock response, with HSF1 inhibitors like NXP800 in clinical trials for treatment-refractory disease. By targeting this molecular heterogeneity, ongoing research aims to deliver more effective, personalized treatments to improve survival and quality of life for men with advanced prostate cancer.

P1, N=30, Active, not recruiting, Mayo Clinic | Recruiting --> Active, not recruiting

P1, N=45, Active, not recruiting, Nuvectis Pharma, Inc. | Recruiting --> Active, not recruiting

Overall, NXP800 has anti-tumor activity against treatment-resistant PCa models, including molecular subtypes with limited treatment options, supporting its consideration for PCa-specific clinical development.

P1, N=61, Recruiting, Nuvectis Pharma, Inc. | Trial completion date: Jun 2025 --> Dec 2025 | Trial primary completion date: Dec 2024 --> May 2025

P1, N=30, Recruiting, Mayo Clinic | Not yet recruiting --> Recruiting

P1, N=30, Not yet recruiting, Mayo Clinic

Further multiparameter optimization led to the design of the clinical candidate, CCT361814/NXP800 22, a potent and orally bioavailable fluorobisamide, which caused tumor regression in a human ovarian adenocarcinoma xenograft model with on-pathway biomarker modulation and a clean in vitro safety profile. Following its favorable dose prediction to human, 22 has now progressed to phase 1 clinical trial as a potential future treatment for refractory ovarian cancer and other malignancies.

P1, N=61, Recruiting, Nuvectis Pharma, Inc. | N=17 --> 61 | Trial completion date: Apr 2023 --> Jun 2025 | Trial primary completion date: Jan 2023 --> Dec 2024

Using an siRNA approach to determine if activation of the ISR components was contributing to growth inhibition following NXP800 exposure, we found that blocking the induction of ATF4 reduced the response of NXP800-sensitive SK-OV-3 human ovarian carcinoma cells to NXP800 treatment.In summary, NXP800 acts on cancer cells to induce activation of the ISR pathway via GCN2, which then leads to inhibition of HSF1 activation. Further studies are underway to determine the precise molecular target of NXP800 and the mechanism of HSF1 pathway inhibition.

NXP800, a HSF1 inhibitor, demonstrated significant therapeutic activity in a cholangiocarcinoma PDX. Further studies are needed and being performed to determine the role of HSF1 inhibition in human cholangiocarcinoma.