Kaplan-Meier survival curves for canine patients with (n = 3; huTyr Ab+) and without (n = 6; huTyr Ab-) positive humoral responses to the xenogeneic huTyr DNA vaccination. Dots denote patients that were censored from the analysis. The difference in ST between the two groups was not statistically significant (P = 0.148; log-rank analysis), possibly due to the small patient group size.