Doctors routinely recommend biopsies to diagnose cancer. PET and CT scans usually follow if a biopsy shows a positive result. Biopsies can harm the patient. Biopsies do occasionally provoke metastasis. All cells are surrounded by interstitial fluid. This fluid drains into the lymph system through lymph channels, to the upper left chest, where the major lymphatic channel drains directly into a blood vessel. Continue reading →