NCCN Guidelines for Patients
Stages I and II Breast Cancer, Version 1.2014
Risk factors for mesothelioma
Webpages | Review
If the breast cancer is hormone receptor–
positive, hormone therapy will likely
be part of your treatment. Hormone
therapy stops the growth of cancer cells
that is caused by hormones. Hormone
therapy may be started during or after
radiation therapy. Part 6 presents the
recommendations for who should take
hormone therapy and which types of
hormone therapy should be taken.
Types of hormone therapy
4 main groups
Estrogen and progesterone are hormones that cause
some breast cancer cells to make more cancer cells.
Estrogen is mostly made by the ovaries and made in
small amounts by the adrenal glands, liver, and body
fat. Progesterone is also mostly made by the ovaries.
Blocking these hormones from working or lowering
hormone levels can help stop breast cancer from
growing. There are many types of hormone therapy
used to treat early breast cancer.
Antiestrogens are drugs that stop the effect of
estrogen on cancer cell growth. Tamoxifen is an
antiestrogen used for stages I and II breast cancer.
Tamoxifen treats breast cancer by attaching to the
estrogen receptors and blocking estrogen from
attaching. It is a pill that is taken every day during the
course of treatment.
Hormone th apy
58 Types of hormone therapy
60 Should I take hormone therapy?
62 Hormone therapy regimens
64 Side effects of hormone therapy