Unveiling the Role of HGF c Met Signaling in Non Small Cell Lung Cancer Tumor Microenvironment Dihexa (also known as PNB 0408) is an experimental small molecule derived from angiotensin IV. It was engineered to cross the bloodbrain barrier and has shown synaptogenic effects in preclinical models. The often quoted Dihexa is an experimental cognitive peptide that may help the brain build stronger connections between neurons instead of just temporarily boosting neurotransmitters like many nootropics do. It works through the HGF c Met pathway, HGF c MET pathway in cancer: from molecular characterization to clinical evidence Oncogene