In another example of pH‐ and redox‐responsive gene delivery, a polysaccharide‐enveloped liposome nanocarrier has been synthesized for RNAi via survivin gene silencing.[215] Survivin, an inhibitor of cell apoptosis, is strongly expressed in malignant tumors such as breast cancer and increases of risk of cancer cell proliferation and metastasis. Here, BIRC5 is linked to breast carcinoma.