BCL2 and lung carcinoma: developed PEG‐coated carbon nanotube system loaded with small molecule BCL‐2 inhibitor ABT‐737 for its targeted delivery to lung cancer cells.[131] The authors investigated cellular uptake, apoptosis, and cytotoxicity this PEG‐CNT‐ABT737 nanotube system in lung cancer A549 cells and observed BCL‐2‐mediated apoptosis of lung cancer cells.