While the expression of HER2 protein on MDA-MB361 cells was lower than the other HER2-overexpressing cancer cells (Figure 2) [21], long-term cell survival was, nonetheless, maintained at low levels, albeit a slight recovery evident at 5 days when HER2-overexpressing cells were treated with NIR-PIT by the Affibody–IR700Dye conjugate (Figure 6). This evidence concerns the gene ERBB2 and cancer.