CDK2 and lung carcinoma: Phellinus linteus suppressed proliferation by the inhibition of cyclin-dependent kinases cdk2, 4 and 6, and induced apoptosis through the activation of caspase 3 in lung cancer cells (Guo et al, 2007) and apoptosis of prostate cancer cells (Collins et al, 2006; Zhu et al, 2007).