His prognosis was n't great . Zach Sobiech was diagnosed at 14 with osteosarcoma , a bone cancer . He had surgery to remove the tumor and it spread throughout his body. Zach 's song `` Clouds '' went viral on YouTube ; now celebs have posted a response .
Zach Sobiech was diagnosed at 14 with osteosarcoma , a bone cancer . He had surgery to remove the tumor and it spread throughout his body. Zach 's song `` Clouds '' went viral on YouTube ; now celebs have posted a response .