Word f warning. The Formula Swiss site is a sales site. It doesn't offer any reliable peer-reviewed research.

This information from Cancer Research UK, however, does look at all the research ongoing in this field.

Whereas medical use of cannabis has been approved in UK, it's for pain relief in chronic cases such as Multiple Sclerosis. Although some association has been claimed with reduction in growth of some cancers, that's not been replicated. On the contrary, cancer has been linked to an increase in testicular cancer.

This paper published in Nature yesterday,
Weighing the dangers of cannabis warns of potential harm from Cannabinoid use. Since it has not been subject to the rigorous testing of conventional medication, it's too early to say what safe uses there may be.

One thing is certain, however, there is no evidence that cbd oil has ever cured cancer let alone oesophageal adenocarcinoma.