AZU1 and metastatic melanoma: Among tumors from patients with melanoma (primary: N = 29, age range = 21–84 years old; metastatic: N = 34, age range = 24–85 years old) and breast cancer (primary: N = 22, age range = 30–81 years old; metastatic: N = 14, age range = 28–79 years old) (Supplementary Fig. 10), the P. aeruginosa azu gene was detectable in 27.6% of primary melanomas and 5.9% of metastatic melanomas (Fig. 4a).