A British man who rejected the standard of care to treat his brain cancer has lived with the typically fatal glioblastoma tumour growing very slowly after adopting a ketogenic diet.
This is helping with the case study that researchers say reflects the benefits of using the body's own metabolism to fight this particularly aggressive cancer instead of chemo and radiation therapy.
Published in the journal Frontiers in Nutrition, the report is the first evaluation of the use of ketogenic metabolic therapy (KMT) without chemo or radiation interventions, on a patient diagnosed with IDH1-mutant glioblastoma (GBM).
Ketogenic therapy is a non-toxic nutritional approach, viewed as complementary or alternative, that uses a low-carbohydrate, high-fat diet to manage a range of cancers, including glioblastoma.
Glioblastoma kills about 15,000 people each year and remains largely unmanageable. While the standard of care has shifted to new immuno-therapies, the median survival time of 11 to 15 months for GBM has not improved significantly for more than 100 years.
A number of high-profile cases have illustrated the deadly progression of GBM. The late U.S. Sen. John McCain was diagnosed at age 80 with glioblastoma in July 2017 and died in August 2018. US Sen. Edward M. Kennedy lived for a year after his diagnosis with GBM, dying at age 77. Beau Biden, son of US President Joe Biden, was diagnosed at age 44 with GBM in August 2013 and died in May 2015.
The current standard of care for GBM involves surgical resection, radiation, and chemotherapy, which have been shown in studies to result in significant toxicity.
However, large-scale clinical trials for alternative therapies are difficult to initiate, leading researchers to carefully examine individual cases.
The patient, in this case, was diagnosed with glioblastoma in 2014 and avoided the traditional standard of care and instead embarked on a self-directed ketogenic diet — low in carbohydrates and high in fat — in an effort to manage his cancer.
The researchers found, "the patient's tumour continued to grow very slowly over a three-year period without expected vasogenic edema until 2017."
At that point, the patient underwent 'surgical debulking' of his tumour. The pathology specimen confirmed the diagnosis of GBM and that the patient's tumour also contained the IDH1 mutation.
"Following surgery, the patient continued with a self-administered ketogenic diet to maintain low Glucose Ketone Index (GKI) values, indicative of therapeutic ketosis," the researchers report.
"In light of continued slow progression of the residual tumour, the patient intensified his KMT starting in October 2018 with the inclusion of mindfulness techniques to reduce stress. While the MRI shows slow interval tumour progression, the patient remains alive with a good quality of life at the time of this report."
He is now 82 months from his original diagnosis.
"We were surprised to discover that KMT could work synergistically with the IDH1 mutation to simultaneously target the two major metabolic pathways needed to drive the growth of GBM," said Seyfried. "Glucose drives the glycolysis pathway, while glutamine drives the glutaminolysis pathway."
He added: "No tumour, including GBM, can survive without glucose and glutamine. Our study has identified a novel mechanism by which an acquired somatic mutation acts synergistically with a low carbohydrate, high-fat diet to provide long-term management of a deadly brain tumour."
Despite the compelling interest in such individual case studies, the co-authors note: "We cannot predict if the therapeutic response to KMT seen in our GBM patient will also be seen in other similarly treated GBM patients. For those GBM patients not fortunate enough to have acquired the spontaneous IDH1 mutation in their tumour, glutamine targeting drugs used with KMT will be necessary to reduce tumour growth."
(Inputs from ANI)