Prostate tumor grading - what do the numbers mean?

Higher = aggressive: For grading, the pathologist looks at the tissues under the microscope and assigns two numbers based on their criteria for the differentiation or 'aggressiveness' of the glands. The numbers are each from 1-5, and they are added to generate a number from 2-10, with 10 being the most dangerous type of prostate cancer, with the highest gleason score.