According to the official blog, anime song singer Wada Koji
has announced that he will suspend his activity due to the recurrence of cancer. Wada said he had cancers in his right pharynx and lymph nodes of his neck eight years ago, but those had been considered to be completely removed by surgeries and chemical treatments. However, he was recently diagnosed that the cancer has metastasized and redeveloped in the different organ. Wada said he will concentrate on the treatment and will be back as soon as possible.
Source: Wada's official blog