A study published Oct. 4 in Gastroenterology further validates that pyrvinium, a drug that has been used for decades for intestinal pinworms, can be repurposed as a preventative treatment for stomach cancer.

Eunyoung Choi, PhD, assistant professor of Surgery, and colleagues have demonstrated in human organoids and mouse models that the drug induces cell death in precancerous lesions.

Pyrvinium blockades both the MEK/ERK and STAT3 signalling pathways.

In another study she led, which was published last year in Gastroenterology, the researchers demonstrated that pyrvinium blocked regeneration of dysplastic stem cells.

Choi has published a series of studies that have delved into the mechanisms by which gastric cancer forms through dysplasia, the abnormal growth or development of cells.

Globally, gastric cancer is the fifth most common cancer and the third deadliest.

The current standard of treatment for gastric dysplasia is limited to endoscopic resection or surgical excision of small lesions.

“Our study suggests that pyrvinium can lead to mucosal recovery from metaplastic and/or dysplastic to normal by targeting a stem cell population through a dual MEK/ERK and STAT3 inhibition. Thus, pyrvinium is a unique candidate for potential therapeutic prevention of gastric cancer in patients with high-risk precancer,” said Choi, the study’s senior author.

Pyrvinium has been used for over 70 years for intestinal pinworms and has a known safety profile.

Recent preclinical studies have reported that the drug can also impede the growth of colorectal, breast, lung, liver and pancreas cancers by inhibiting crucial signalling pathways.

Choi’s lab, however, is the first to identify the specific dysplastic stem cells that are a key source of clonal evolution of dysplasia to gastric cancer.

In this latest study, the researchers revealed through scRNA-seq data analyses that pyrvinium targeted the CD133+/CD166+ stem cell populations as well as proliferating cells in dysplastic organoids.

The drug also inhibited metaplasia progression to dysplasia and promoted the regeneration of normal gastric mucosa by contributing to an anti-inflammatory microenvironment.

This effect suggests a lower likelihood of potential adverse effects on tissue regeneration.

“With the pyrvinium’s possible advantages including its well-characterized lack of side effects, a next step to move forward would be an early phase trial of pyrvinium to reverse the metaplastic gastric mucosa in patients with high-risk precancer with a clinical research group,” Choi said.

Source: Vanderbilt University Medical Center