The effects of environmental disturbances on tumor growth
  In this study, the analytic expressions of the steady probability distribution of tumor cells were established based on the steady state solution to the corresponding Fokker-Planck equation. Then, the effects of two uncorrelated white noises on tumor cell growth were investigated. It was found that the predation rate plays the main role in determining whether or not the noise is favorable for tumor growth. 
Ning Xing Wang, Xiao Miao Zhang, Xiao Bing Han
physics.data-an q-bio.CB