HDAC Combination Radiosensitization Record

PROBLEM: The newest combination in the 2026 literature is also the most selective: hafnium oxide nanoparticles plus a histone deacetylase inhibitor (SAHA), which holds chromatin open so radiation damage lands harder. The combination raised ROS, collapsed mitochondrial membrane potential, and multiplied DNA double-strand breaks — while leaving noncancerous fibroblasts unharmed. Cancer-selective radiosensitization is the prize the whole field is chasing, because it is what lets a dose kill the tumor without killing the patient. But selectivity claims are the easiest to overstate: a combination selective in a dish is not selective in a body, and the record needs to say which.

SOLUTION: An HDAC combination radiosensitization record: every nanoparticle-plus-HDAC combination logged with its selectivity measurement, the model it was measured in, and the healthy-cell control — so a selectivity claim is always tied to the model that produced it.

EVIDENCE BASIS: DOCUMENTED — HfO2NP + HDAC inhibitor (SAHA) + irradiation: significantly higher ROS, massively reduced mitochondrial membrane potential, increased DNA double-strand breaks, marked reduction in colony-forming potential in 2D and 3D models, significant apoptosis, no cytotoxicity in noncancerous fibroblasts (Bocz et al., Nanoscale Adv. 2026;8:2003–2020, doi: 10.1039/d5na00845j). Sources: doi: 10.1039/d5na00845j.