It has been shown via in vitro studies that Tea Tree oil has cytotoxic effects towards many cancer cell lines, killing them at concentrations as low as 0.02 to 2.7 g/L. This has been seen in CTVR-1 (leukaemia), Molt-4 (leukaemia), K562 (myelogenous leukaemia), HeLa (cervical adenocarcinoma) and Hep G2 (hepatocellular carcinoma) cell lines. [72]