Hair loss is a transient and usually (although not always) completely reversible consequence of cancer chemotherapy that is often psychologically devastating. For some patients, the emotional trauma may be so severe as to lead to discontinuing or refusing treatment that might otherwise be beneficial [1-4].
The anatomy and physiology of hair growth, the effects of chemotherapy, and possible means for preventing alopecia are discussed here.
ANATOMY AND PHYSIOLOGY
The hair fiber is the product of the hair follicle and is a complex keratinized structure consisting of a cuticle, cortex and medulla. The hair follicle is composed of three main parts when viewed in longitudinal section (figure 1) :
●The lower portion, which extends from the base of the hair follicle to the insertion of the arrector pili muscle. This lower portion, in turn, is comprised of several major components:
•The hair bulb, which contains the dermal papilla and hair matrix. The dermal papilla controls the number of matrix cells, which determines hair fiber size . Melanocytes, which are responsible for hair color, are present among the matrix cells of the hair bulb.