I tried with 17: https://pmc.ncbi.nlm.nih.gov/articles/PMC7925581/

From figure 1:

> Complete tumor regression was observed in 6/15 mice on the combination treatment, 1/20 on ivermectin alone, 1/10 on anti-PD1 antibody alone, and 0/25 on no treatment.

Ok, that looks interesting.