1. Kumar V, Abbas A, Aster JC (2020) Robbins and Cotzan, pathologic basis of disease, 10th edn. Saunders, Philadelphia
2. Devita VT, Hellman S, Rosenberg SA (2011) Cancer: principles and practice of oncology, 9th edn. Lippincott, Philadelphia
3. Holland JF, Bast RC, Morton DL, Frei EIII, Kufe DW, Weichselbaum RR (2009) Cancer medicine, 6th edn. Williamsand Wilkins, Baltimore
4. Collan Y (1989) General principles of grading lesions in diagnostic histopathology. Pathol Res Pract 185:539–543
5. Herberman RB, Ortaldo JR (1981) Natural killer cells as an initial defense against pathogens. Science 2:24–30