Impotence drugs that may kill off cancer cells could boost survival rates

6 mins read

VIAGRA shrinks cancerous tumors and boosts effects of chemotherapy, study suggests

  • Phosphodiesterase type 5 (PDE5) inhibitor drugs were tested in lab and on mice
  • Destroyed cells called cancer-associated fibroblasts, which help tumors grow
  • Boosted the success of chemotherapy by more than double in study on rodents

Drugs routinely used to treat erectile dysfunction could boost survival rates in people with certain cancers by making their treatment more effective.

Researchers in the UK have found that drugs called phosphodiesterase type 5 (PDE5) inhibitors, which include Viagra, can potentially improve how well patients with esophageal cancer respond to chemotherapy. 

The hope is it could ultimately help treat other cancers, too.

In the US, there are about 21,600 new esophageal cancer cases diagnosed every year. In the UK there are around 9,300 new diagnoses.

The cancer also has one of the lowest survival rates — just 19 per cent of patients survive for five years or more. 

By contrast, 85 per cent of breast cancer patients survive their disease for five years or more, according to Cancer Research UK.

Little blue pill is magic, after all! Viagra was found to kill off cancerous cells and boost the effects of chemotherapy in lab and mice studies

Little blue pill is magic, after all! Viagra was found to kill off cancerous cells and boost the effects of chemotherapy in lab and mice studies

‘Esophageal cancer is hard to treat because around 80 per cent of people don’t respond to chemotherapy,’ says Tim Underwood, a professor of gastrointestinal surgery at Southampton University, who led the new research.

The new study, published in the journal Cell Reports Medicine, suggests that PDE5 inhibitors could improve patient outcomes.

In pill position: How your position can affect medication

A new study by Johns Hopkins University in the U.S., published in the journal Physics of Fluids, found that tablets enter the bloodstream ten times faster if someone lies on their right side after taking them.

Using a simulated stomach, the team, led by Rajat Mittal, a professor of medical engineering and medicine, discovered that this means the pill sits closer to the area of the stomach where it’s ‘ground’ up and absorbed.

However, you shouldn’t lie down after taking every drug.

‘Taking pills upright is still best, because that is how our digestion is meant to work — but, if you are bedridden, or take pills at night and need to lie down soon after, then turning to the right or lying on your back are better options than lying on your left-hand side,’ Professor Mittal told Good Health.

The drugs act on smooth (involuntary) muscle, making it relax. In the case of impotence, this helps the smooth muscle in blood vessel walls relax and dilate, increasing blood flow to the penis.

In cancer, the drugs help by targeting cells called cancer-associated fibroblasts, which are found in the area surrounding cancers including prostate and lung, as well as esophageal cancer.

Fibroblasts help with the formation of healthy connective tissue, which provides the basic structure of organs and human tissue.

However, cancer cells send chemical signals that corrupt the fibroblasts and change their nature — effectively the fibroblasts begin to resemble smooth muscle, so that they support the cancer’s growth and build up its resistance to chemotherapy.

The PDE5 inhibitor drugs relax the structure of the cancer fibroblasts, so that they become floppy, meaning they can no longer help the tumor to thrive and grow.

When the Southampton team tested PDE5 inhibitor drugs on cancer cells in the lab and on mice, they found that chemotherapy was then effective in 75 per of cases, compared with the usual 20 per cent of esophageal cancer patients. The team hope to start human trials soon.

Their work follows previous studies, including one published last year by Duke University in the U.S., which found that exposure to PDE5 inhibitors stopped prostate cancer growing and spreading.

Commenting on the research, Dr Sam Godfrey, research information lead at Cancer Research UK, described the study results as ‘exciting’ adding: ‘Cancer-associated fibroblasts are cancer’s sidekick, building molecular scaffolding that supports the tumor’s growth. Knocking down that scaffolding is one of many ways that we could use to treat cancer more effectively in the future.’

Treatment of cancer that’s spread may be transformed by a new blood test that could help doctors select better treatment options for individual patients.

Scientists at the University of British Columbia in Canada have developed a test that works alongside a sophisticated computer programme to analyse circulating DNA (ctDNA), which is shed by metastatic tumors.

Metastatic cancer tends to develop molecular changes that make it less sensitive to treatment. Writing in the journal Nature, the scientists said they hope the analysis will improve the selection of treatments suited to specific tumors.


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