I thought you might find the following of interest – a link to a ”not yet recruiting” trial looking at the efficacy of cannabidiol-based regimens in treating various cancers including liver cancer. Cholangiocarcinoma is not specifically mentioned in the announcement. The article Gavin posted also mentions there are some trials in the works.
This is correct. Unfortunately, until a pharmaceutical company can either patient Cannabis, synthesize it, or somehow make money off it, there will never be a study that the medical community will deem sufficient to prove it can treat cancer. Cancer is also a huge money maker. The drug companies have no intention to cure a disease they make billions if not trillions of dollars on treating.