This molecule can distinguish between normal cells membranes and bacteria membranes. That's quite easy. Most of the difference between cancer cells and normal cells is in the nucleus, not the membrane, and most anti-cancer drugs target the stage where the nucleus replicates. So, my tentative response is "No".

Having said that, the potential ingenuity of the human race is beyond what I can image right now.

Drugs to attack fungi, let alone cancer, are far more difficult because we're both eukaryotes and share many, many molecular targets. The really hard part is to kill a cell that looks like our cells, but not our cells.

The real art form is to find a mechanism that kills the cancer sufficiently faster than the patient.