An update on ERSO apple.news/ARZSAt-QrRUqh2Kh...
Prior research powers this new study, which developed a small molecule called ErSO. That molecule was able to kill estrogen receptor-positive cancer cells, but undesirable side effects led to more testing. The new research examines a derivative, ErSO-TFPy. This new molecule can kill cancer cells and shrink large tumors. It was also well tolerated by mice, rats and beagles.
At least it explains why ERSO was suddenly dropped by the previous owners.