- Alkaline phosphatase =< 2.5 x institutional upper limit of normal; if alkaline phosphatase is greater than the institutional upper limit of normal (UNL) but less than the maximum allowed, an abdominal (including liver) ultrasound, CT or MRI scan and a radionuclide bone scan must be performed prior to randomization to rule out metastatic disease; if the values are greater than the maximum allowed, patients will not be considered eligible regardless of findings on any supplementary imaging