Kd differs from IC50, LD50, and GI50

Dissociation constant ($K_D$) differs from half-max lethal dose (LD50), inhibitory concentration (IC50), and growth inhibition (GI50).

Figures

Ref https://blog.turbine.ai/p/ic50-is-a-deep-rabbit-hole

IC50: Where you have half as many cells as a controlling medium in a different well LD50: Where you have half as many cells as what you started with GI50: Where cells grow half as fast as they would without the drug Kd: Where the drug is half-bound and half-unbound