Regarding the health status of Western Lowland Gorilla "Toto"

We would like to inform you that the results of the follow-up examination conducted on July 13, 2026, to check on the progress of uterine adenocarcinoma in Toto, Western Lowland Gorilla at Ueno Ueno Zoo, are now available.

This examination involved contrast-enhanced CT scans and other tests to check for changes in the condition of the uterine adenocarcinoma after administration of anticancer drugs, which began at the end of July. Unfortunately, the results showed that the uterine tumor had grown larger than before, and metastatic lesions were also found in the lungs and liver.

We will continue to monitor Toto's condition and conduct regular checkups. Since no particular side effects from the chemotherapy have been observed, we plan to continue administering it. We will manage Toto's care within the group, taking his mental state into consideration and monitoring his health. However, as he has experienced some weight loss, we are isolating him indoors and feeding him separately to ensure he eats more reliably than before.

We will inform you again if there are any changes in your health condition or management methods.