Rex Ryan turned 2-years-old today... but 6 months ago he was diagnosed with cancer. Friends, family, and strangers gathered today to honor this tough toddler. When Rex was 18-months-old he was diagnosed with stage 4 neuroblastoma cancer. He has undergone chemotherapy, blood transfusion and a stem cell transplant. But in celebration of his birthday, a massive party and 5k was held in his honor .. Hundreds laced up their running shoes to raise money for the Ryan family and the cancer endowment fund. Austin police chief Art Acevedo was also in attendance after hearing of Rex's journey. Rex's parents say they are deeply moved by the support.