4-Isothioureidobutyronitrile (Kevetrin) is a small molecule that has demonstrated the potential of becoming a breakthrough cancer treatment by inducing activation of p53. It is a water-soluble, small molecule and activator of the tumor suppressor protein p53, with potential antineoplastic activity. Upon intravenous administration, 4-thioureidobutyronitrile activates p53 which in turn induces the expressions of p21 and PUMA (p53 up-regulated modulator of apoptosis), thereby inhibiting cancer cell growth and causing tumor cell apoptosis. 4-Thioureidobutyronitrile may be effective in drug-resistant cancers with mutated p53. p53 tumor suppressor, a transcription factor regulating the expression of many stress response genes and mediating various anti-proliferative processes, is often mutated in cancer cells. Cellceutix continues to build upon the successful Phase 1 trial evaluating Kevetrin in treating advanced solid tumors conducted at Dana-Farber Cancer Institute and Beth Israel Deaconess Medical Center. Kevetrin, in IV form, was shown to safely modulate, in a non-genotoxic manner, the key tumor suppressor protein p53 as measured through increased expression of p21, a key downstream biomarker of p53. Cellceutix is advancing Kevetrin under an Orphan Drug designation from the Food and Drug Administration (FDA) for the treatment of ovarian cancer, pancreatic cancer and childhood retinoblastoma.