1.   Brain tissue and tumor tissue spilled onto the floor.

2.   Radiation therapy is also improving, allowing a more precise zeroing in on tumor tissue, including tumors deep in the brain, without harm to surrounding tissue.

3.   The drug is one of several candidates in a new class of cancer treatments that make tumor tissues sensitive to light from medical lasers.

4.   The nipple is taken because milk ducts run up in the nipple and can hide tumor tissue, but almost all the rest of the breast skin is left.

5.   They looked for a disordered growth pattern in the tumor tissue.

6.   This technique can pinpoint small areas of active tumor and can help to distinguish recurrent tumor from tumor tissue destroyed by previous treatment.

7.   There is no danger from using tumor tissue in this manner, he said.