URGENT Guidance

Hi, My father is in Stage IV Prostate cancer. He has developed Bone metastasis ans hence had undergone Radiation around the Spine area for 3 days finishing on 11th Oct 2009. Now since then we are awaiting for chemo but his platelet count has come down from 119 to 89 to 86in the last 11 days. Pls advise as to how can his platelet count be increased Rgds