The Use of Vaginal Estrogen in Women With a History of Estrogen-Dependent Breast Cancer

ABSTRACT: Cancer treatment should address female-specific survivorship issues, including the hypoestrogenic-related adverse effects of cancer therapies or of natural menopause in survivors. Systemic and vaginal estrogen are widely used for symptomatic relief of vasomotor symptoms, sexual dysfunction, and lower urinary tract infections in the general population. However, given that some types of cancer are hormone sensitive, there are safety concerns about the use of local hormone therapy in women who currently have breast cancer or have a history of breast cancer. Nonhormonal approaches are the first-line choices for managing urogenital symptoms or atrophy-related urinary symptoms experienced by women during or after treatment for breast cancer. Among women with a history of estrogen-dependent breast cancer who are experiencing urogenital symptoms, vaginal estrogen should be reserved for those patients who are unresponsive to nonhormonal remedies. The decision to use vaginal estrogen may be made in coordination with a woman’s oncologist. Additionally, it should be preceded by an informed decision-making and consent process in which the woman has the information and resources to consider the benefits and potential risks of low-dose vaginal estrogen. Data do not show an increased risk of cancer recurrence among women currently undergoing treatment for breast cancer or those with a personal history of breast cancer who use vaginal estrogen to relieve urogenital symptoms.

Recommendations and Conclusions

The American College of Obstetricians and Gynecologists makes the following recommendations and conclusions:

• Nonhormonal approaches are the first-line choices for managing urogenital symptoms or atrophy-related urinary symptoms experienced by women during or after treatment for breast cancer.
• Among women with a history of estrogen-dependent breast cancer who are experiencing urogenital symptoms, vaginal estrogen should be reserved for those patients who are unresponsive to nonhormonal remedies.
• The decision to use vaginal estrogen may be made in coordination with a woman’s oncologist. Additionally, it should be preceded by an informed decision-making and consent process in which the woman has the information and resources to consider the benefits and potential risks of low-dose vaginal estrogen.
• Data do not show an increased risk of cancer recurrence among women currently undergoing treatment for breast cancer or those with a personal history of breast cancer who use vaginal estrogen to relieve urogenital symptoms.

Background

Oncologic care providers are increasingly recognizing that cancer treatment should address female-specific survivorship issues, including the hypoestrogenic-related adverse effects of cancer therapies or of natural menopause in survivors. Obstetrician–gynecologists and other health care providers frequently face the challenge of understanding and addressing these issues among an increasing cohort of women cancer survivors who experience urogenital symptoms, either from cancer therapy or physiologic menopause. Systemic and vaginal estrogen are widely used for symptomatic relief of vasomotor symptoms, sexual dysfunction, and lower urinary tract infections in the general population. However, given that some types of cancer are hormone sensitive, there are safety concerns about the use of local hormone therapy in women who currently have breast cancer or have a history of breast cancer (1, 2). This document will focus on the use of low-dose vaginal estrogen in women with estrogen-dependent breast cancer.

Nonhormonal methods, including moisturizers, lubricants, and topical anesthetics, are first-line approaches for treating urogenital symptoms or atrophy-related urinary symptoms experienced by women during or after treatment for breast cancer (3, 4). However, for some women, these approaches may have a limited and temporary effect on symptoms and quality of life (5, 6). Vaginal estrogen therapy has been shown to provide women with symptomatic relief of urogenital symptoms associated with perimenopause and menopause (3). Generally, vaginal estrogen delivers lower doses of hormone compared with those formulations developed to provide systemic relief of vasomotor symptoms and, thus, offer a different approach to the management of urogenital symptoms among these patients.

Low-Dose Vaginal Estrogen Preparations and Serum Estrogen Levels

There are three main commercially available preparations of vaginal estrogen in the United States: 1) cream, 2) ring, and 3) tablet (see Table 1 for suggested regimens). (Although there are other forms available, such as compounded vaginal estrogen products, there are concerns regarding the risks of variable composition and potency and the lack of efficacy and safety data [7].) Vaginal estrogen delivers a low dose of hormone to the local vaginal tissue with minimal systemic absorption. Vaginal creams include a 17β-estradiol vaginal cream and a conjugated estrogen cream. The only vaginal tablet product currently available in the United States contains 10 micro-grams of estradiol hemihydrate. Although there are two vaginal rings on the market, only the 17β-estradiol (commonly referred to as estradiol) silastic vaginal ring delivers low-dose hormone to the vaginal tissues. The second product, the estradiol acetate ring, provides systemic levels of hormone and is not discussed in this document.

Studies show that use of low-dose vaginal estrogens does not result in sustained serum estrogen levels exceeding the normal menopausal range; the lowest rates of systemic absorption are found in the ring and the tablet (8–15). When used at the appropriate dose, estradiol creams also deliver a low dose of hormone. Because of the heterogeneity of the estrogens in the formulation, data regarding the use of conjugated equine estrogen cream are less definitive compared with the data for estradiol cream. In addition, delivery of a set dose of estrogen is more variable with the creams in contrast to the tablet or ring. Thus, data regarding estradiol levels associated with vaginal creams have greater variability compared with tablet or ring formulations.

The Use of Vaginal Estrogen by Women With a Current or Prior History of Breast Cancer

Data do not show an increased risk of cancer recurrence among women currently undergoing treatment for breast cancer or those with a personal history of breast cancer who use vaginal estrogen to relieve urogenital symptoms (16). A nested case–control analysis of a cohort study of women with breast cancer who either did or did not use vaginal estrogen showed no increase of recurrence in vaginal estrogen users (17). In another study, the risk of recurrence in women who used vaginal cream was not increased, irrespective of the total dose prescribed (18).

Concerns remain about recurrence risk with use of vaginal estrogen in women with breast cancer who use aromatase inhibitors. Specifically, the threshold for systemic estrogen levels associated with breast cancer recurrence risk has yet to be determined (19). Some authors note that even a small increase in systemic estradiol levels may have a detrimental effect on recurrence risk and that more data are needed before recommendations can be made regarding the use of vaginal estrogen among this population (16, 20). Typically, aromatase inhibitors decrease circulating estradiol levels from 20 pg/mL to less than 1–3 pg/mL (20, 21). Studies have demonstrated an initial increase of serum estradiol with the use of low-dose vaginal estrogen (estradiol ring or the 25-microgram estradiol tablet) among women taking an aromatase inhibitor, though these levels were not sustained over time and increased cancer recurrence was not noted (11).

The use of vaginal estrogens may be appropriate for women with urogenital symptoms who use tamoxifen (22). Low and temporary increases of plasma estrogen do not appear to increase recurrence risk in women using tamoxifen because of a competitive interaction with the estrogen receptor (16). Because of these effects, women on aromatase inhibitors who experience urogenital symptoms refractory to nonhormonal approaches may benefit from the short-term use of estrogen with tamoxifen to improve symptoms, followed by a return to normal aromatase inhibitor therapy for the duration of the treatment course (20).

Conclusion

Nonhormonal approaches are the first-line choices for managing urogenital symptoms or atrophy-related urinary symptoms experienced by women during or after treatment for breast cancer. Among women with a history of estrogen-dependent breast cancer who are experiencing urogenital symptoms, vaginal estrogen should be reserved for those patients who are unresponsive to nonhormonal remedies. Treatment should be individualized based on each woman’s risk–benefit ratio and clinical presentation. The decision to use vaginal estrogen may be made in coordination with a woman’s oncologist. Additionally, it should be preceded by an informed decision-making and consent process in which the woman has the information and resources to consider the benefits and potential risks of low-dose vaginal estrogen. When the decision is made to use vaginal estrogen, it should be prescribed at the lowest dose to affect vaginal symptoms and for a limited period until symptoms are improved.

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