A tubule is just a small tube, the lumen is the opening that goes through the tube. So basically, he's saying there weren't any tubules in my tumor. This is consistent with the observation that my beasties weren't differentiated - they simply weren't organized enough to start forming tubules. Again, a lower score would have been better, but my beasties just get a 3. They also got a 3 on the nuclear pleomorphism score.
Nuclear pleomorphism describes the variety of forms seen in the nuclei of the cells in the tumor.
Again, a lower score would have been better. A person could start to get bummed out, except the good news is coming up next. My tumor got a score of 1 on mitotic rate. The microscopic section goes on to note that fibrocystic changes are noted on some of the slide. This is not significant.