Chocolate holds back the Growth of Breast Cancer Cells

A naturally occurring, cocoa-derived pentameric procyanidin (pentamer) was previously shown to cause G0/G1 cell cycle arrest in human breast cancer cells by an unknown molecular mechanism., ... we show that pentamer selectively inhibits the proliferation of human breast cancer cells...
The novel aspect of the study was the manner in which pentameric procyanidin exerted its effects, as it appeared to jointly deactivate several regulatory proteins. The main driver of the current medical interest in chocolate appears to be Mars Inc., which held a conference in Switzerland where researchers discussed how pharmaceutical products could be derived from cocoa sources.
Conclusion
What's all this mean? There's magic compound: pentamer, which has proteins that inhibit cancer cells from developing.
Do you think 72 hours of grinding cocoa beans would allow pentamer to survive? No way. The over grinding process typical in chocolate making disintegrates the cocoa.