**Tracking PSA Levels in Prostate Cancer**

by **Mike Martin** with **Kristin Swanson**

You can use this page to investigate Prostate-Specific Antigen (PSA) levels associated to prostate cancer. *p*(*t*) is the serum PSA level and plotted in BLACK in the graph below. *β*_{h} is the normal production rate of PSA for healthy prostate endothelial cells. *β*_{c} is the production rate of PSA for cancerous prostate endothelial cells. *V*_{h} is the volume of benign PSA-producing cells. *V*_{c} is the volume of cancerous PSA-producing cells and plotted in DASHED RED in the graph below. *γ* is the loss rate of PSA in the blood. The model equations are

*V*_{c}(*t*) = *V*_{o}*e*^{ρt}

The parameters for these functions can be entered below.