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A research collaboration led by scientists from institutions in Japan including Tokyo University of Agriculture and Technology TUAT has developed a new experimental cancer model for dog bladder cancer. Urine samples were used for a D cell culture method called organoid culture. This method will allow us to quickly determine the proper chemotherapy and to identify new biomarkers of both dog and human bladder cancer in the near future.

The researchers published their results on July rd in Cancer Science.

About .% of humans suffer from bladder cancer. The most common symptom of cancer is blood in the urine and pain during urination. In the United States, , people are diagnosed with bladder cancer in and , are dead. About % of all bladder cancers are transitional cell carcinoma, which is usually invasive. In case of dogs, this cancer is detected very late, resulting in poor survival.

For dogs, bladder cancer should be diagnosed as early as possible, said Tatsuya Usui, DVM, Ph.D., corresponding author on the paper and senior assistant professor in the Laboratory of Veterinary Pharmacology, Department of Veterinary Medicine at TUAT in Japan. It was, however, very hard to grow bladder cancer cells on flat dishes, which is called a traditional D cell culture method. Those researchers then tried a D cell culture method called organoid culture. They collected urine samples from bladder cancer dogs and successfully grew bladder cancer cells in urine using this culture system. These cells grown in the D cell culture express the same set of genes as the original cancer tissues do.

Those results encouraged us to test anti-cancer drugs on cells grown in the D cell culture. As we expected, the sensitivity of each drug can be easily monitored, said Usui. It is now possible that bladder cancer cells from each dog using this system can be treated by several anti-cancer drugs. We can then find which drug is more effective for each dog in the lab before actual treatment. So we would like to apply the system of urine sample-derived dog bladder cancer D culture to precision veterinary medicine. In addition, we opened a new avenue for establishing the novel therapeutic strategy against urological cancer in both dog and human.


For more information about the Usui laboratory, please visit

About Tokyo University of Agriculture and Technology TUAT

TUAT is a distinguished university in Japan dedicated to science and technology. TUAT focuses on agriculture and engineering that form the foundation of industry, and promotes education and research fields that incorporate them. Boasting a history of over years since our founding in , TUAT continues to boldly take on new challenges and steadily promote fields. With high ethics, TUAT fulfills social responsibility in the capacity of transmitting science and technology information towards the construction of a sustainable society where both human beings and nature can thrive in a symbiotic relationship. For more information, please visit

Original publication:

Cancer Sci. Jun . &#; Establishment of a novel experimental model for muscle-invasive bladder cancer using a dog bladder cancer organoid culture.&#; Elbadawy M, Usui T, Mori T, Tsunedomi R, Hazama S, Nabeta R, Uchide T, Fukushima R, Yoshida T, Shibutani M, Tanaka T, Masuda S, Okada R, Ichikawa R, Omatsu T, Mizutani T, Katayama Y, Noguchi S, Iwai S, Nakagawa T, Shinohara Y, Kaneda M, Yamawaki H, Sasaki K.

doi: .cas..

Tatsuya Usui, DVM, PhD.&#; Senior Assistant Professor&#; Laboratory of Veterinary Pharmacology, Department of Veterinary Medicine, Faculty of Agriculture, TUAT, Japan&#; E-mail: fugo.tuat.ac.jp&#;

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