Aspherical 47,000 males are identified with prostate most cancers annually within the United Kingdom, with 11,631 deaths from the illness.
Michael English, 72, was one of 258 men who took part in the trial.
"Today I'm effectively cancer-free".
Pembrolizumab, also known by its brand name Keytruda, is one of a new class of drugs called "checkpoint inhibitors".
He said: "We were astonished when scans showed that the tumour had become undetectable".
He says he's now planning out the next 20 years of his life, not the next two.
Eleni Efstathiou, MD, and colleagues at The University of Texas MD Anderson Cancer Center in Houston, studied 197 patients with M0HNPC randomly assigned to receive AA plus leuprolide (99 men) for 8 months or leuprolide alone (98 men). Black patients experienced higher rates of several hormonal-based toxicities, such as hyperglycemia, hypokalemia, and hot flashes, "suggesting perhaps a greater exposure risk to this medicine", George said.
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In addition, he said, "This research shows that by providing equal access to treatment, we can reduce racial disparities in outcomes for men with advanced prostate cancer".
However, he said that only between 10% and 15% of patients had any response to the therapy at all.
That is not unusual for immunotherapy. However, the researchers were expecting it, since immunotherapy only works for some patients.
The researchers from London think that patients that have heavily-mutated cancer respond better to immunotherapy.
Nell Barrie, from Cancer Research UK, said: "The next step will be to find out how to tell which men will benefit from taking this drug". As a result, there is insufficient evidence about possible differences in treatment efficacy and side effects by race.
Immunotherapy drugs work by stimulating the immune system to recognise and fight the cancer, and are used to treat some advanced cancers, including lung and melanoma.
The recent study with a drug named pembrolizumab was worked out with those who are at the very advanced stage of the prostate cancer. It is an IgG4 isotype antibody that blocks a protective mechanism of cancer cells, and allows the immune system to destroy those cancer cells. The team presented their findings in Chicago, where cancer doctors and scientists go to the annual meeting of the American Society of Clinical Oncology.