Surprisingly, the presence of tumor‐associated P. aeruginosa biofilms could prevent the death of iron‐treated tumor cells (Figure 3e,f), where they possessed reduced expression of transferrin receptor (Figure 3g) and intracellular ROS levels (Figure 3h), showing that ferroptosis in tumor cells was suppressed by tumor‐associated P. aeruginosa. Here, TFRC is linked to neoplasm.