A programmed computer functioning as a classifier operates on mass spectral data obtained from a blood-based patient sample to predict indolence or aggressiveness of prostate cancer. Methods of generating the classifier and conducting a test on a blood-based sample from a prostate cancer patient using the classifier are described.本發明係關於充當分類器之程式化電腦對自以血液為主之患者樣本獲得的質譜資料進行操作以預測前列腺癌之無痛性或侵襲性。描述產生該分類器及使用該分類器對來自前列腺癌患者的以血液為主之樣本進行試驗的方法。