One key question about wheatgrass is how long to wait after cutting it before you consume it? Most people, taking their cue from Ann Wigmore, say to take it immediately after cutting and juicing.
However, the hormone abscisic acid (ABA) is 40 times more potent 4 hours after cutting the wheatgrass than it is at the time of cutting.
So the question boils down to this: How important is ABA to treating cancer compared to the other anticancer substances in wheatgrass? http://www.cancertutor.com/Cancer/Wheatgrass.html