A cancer patient who accepted the disease would kill him saw his tumours shrink – by taking drops of cannabidiol (CBD) oil each day.
The 81-year-old, who hasn't been identified, repeatedly refused chemotherapy and other treatments to prolong his life.
Instead, the ex-smoker, believed to be from the Stoke-on-Trent area, opted to take CBD oil for three months to tackle his lung cancer.
Doctors have now published stunning scans, showing how doing so halved the size of his tumours and reversed the progression of his disease.
The tale has been published in a medical journal, where doctors claimed 'CBD may have had a role in the striking response'.
The 81-year-old, who hasn't been identified, repeatedly refused chemotherapy and other treatments to prolong his life (pictured a CT scan of the man's tumours in July 2017)
Instead, the ex-smoker, believed to be from the Stoke-on-Trent area, opted to take CBD oil for two months to tackle his lung cancer (pictured, a scan of his cancer in November 2017)
CBD - which doesn't cause a 'high' – is an extract of the cannabis plant. It is legal in the UK and can be sold on the high street.
The anti-inflammatory compound is already backed for its plethora of benefits by the World Health Organization.
However, the latest case report offers hope it could tackle certain forms of cancer, as well as combating pain, epilepsy and anxiety.
Doctors at the Royal Stoke University Hospital treated the patient, who already survived a shave with prostate cancer 15 years ago.
They pointed to an array of promising research which has suggested CBD may have the power to slow the growth of some tumours.
However, claims that cannabis as a whole could have any helpful impact on cancer are widely doubted among the medical community.
Scientists believe CBD produces oxygenated chemicals in the body which may cause cancerous cells to kill themselves.
Though, several other pathways have also been suggested – including stopping the tumour from recruiting cells that help them grow.
Ian Hamilton, a drug researcher at the University of York, who did not treat the patient, told MailOnline the case report was 'important'.
He said: 'This single case study adds to several that offer some promise in the use of CBD products in the treatment of cancer.
The tale has been published in a medical journal, where doctors claimed 'CBD may have had a role in the striking response' (pictured, a scan of his cancer in July 2017)
But, in a bizarre twist of events, a CT scan in November 2017 (pictured) revealed the 'near total resolution' of the mass to just 1.3 by 0.6cm
Tetrahydrocannabinol (THC) and cannabidiol (CBD) are both derived from the cannabis plant.
Together, they are part of the cannabinoid group of compounds found in hashish, hash oil, and most strains of marijuana.
THC is the psychoactive compound responsible for the euphoric, 'high' feeling often associated with marijuana.
THC interacts with CB1 receptors in the central nervous system and brain and creates the sensations of euphoria and anxiety.
CBD does not fit these receptors well, and actually decreases the effects of THC, and is not psychoactive.
CBD is thought to help reduce anxiety and inflammation.
'I think there is real potential with CBD but there is also a lot of false hope being given. This kind of case study is important but is unlikely to change medical