Breast cancer survivors have specific gynecological needs

Addressing sexual health

Dyspareunia affects up to 45% of cancer survivors, Dr. Keyser said, and multiple treatment options exist for breast cancer survivors. The therapies she discussed included lubricants, moisturizers, local vaginal estrogen, DHEA, ospemifene, and CO₂ laser therapy.

Though Dr. Keyser briefly touched on vaginal lubricants and moisturizers, Dr. Streicher was disappointed that Dr. Keyser did not clearly define and differentiate between lubricants and moisturizers or mention hyaluronic acid products. Dr. Streicher also disagreed with the way Dr. Keyser represented the benefits of coconut oil as a lubricant. “Oils are not condom compatible and are known to potentially increase the risk of infection, and not just from poor handwashing,” Dr. Streicher said.

Small retrospective studies support the safety of topical vaginal estrogen in breast cancer survivors, Dr. Keyser said, and the 10-mcg Vagifem tablet and vaginal estradiol ring appear to have the lowest systemic absorption. ACOG guidance recommends that women taking aromatase inhibitors who don’t respond to nonhormonal approaches may benefit from switching temporarily to tamoxifen with vaginal estrogen and then returning to aromatase inhibitors. However, Dr. Keyser said there’s plenty of data to support using vaginal estrogen in patients taking aromatase inhibitors.

“I do feel that it’s safe for patients, whether they’re on tamoxifen or aromatase inhibitors, to take vaginal estrogen,” Dr. Keyser said. “I usually stick with the estradiol vaginal ring or the estradiol tablet, and I base that on a patient’s comfort with placing and removing a ring.” She also, instead of asking the patient’s hematologist-oncologist, simply notifies them of the treatment since most hematologist-oncologists are less familiar with the data.

Another effective option is vaginal DHEA/prasterone, which can significantly improve sexual desire, arousal, pain, and overall sexual function. Although breast cancer patients were included in early studies on DHEA, Intrarosa manufacturers excluded breast cancer patients in their Food and Drug Administration application, resulting in a package stating that “use of exogenous estrogen is contraindicated in women with a known or suspected history of breast cancer” and that “Intrarosa has not been studied in women with a history of breast cancer.” While that’s true for Intrarosa specifically, DHEA has been studied in breast cancer patients, Dr. Keyser said, so she expects to see more research in this area.

Ospemifene is another option for improving vulvovaginal atrophy but cannot be taken at the same time as tamoxifen. It has similar chemopreventive effects as tamoxifen in rat studies, but it’s not as effective. It’s a reasonable option in women with refractory genitourinary syndrome of menopause (GSM) who have completed their 5-10 years of adjuvant therapy and have no history of venous thromboembolism.

Dr. Keyser said CO₂ laser therapy is still being studied for treating GSM, and current data have shown benefits for dyspareunia and vaginal dryness without documented harms. There have now been randomized, controlled trials; however, since it’s not FDA approved, it’s not covered by insurance and costs approximately $5,000 for three treatments.

Dr. Streicher was glad to see Dr. Keyser’s discussion of the safety and types of local vaginal estrogen, “although she neglected to mention the 4-mcg vaginal suppository, Imvexxy, which has the lowest systemic absorption,” Dr. Streicher said. Dr. Streicher also felt the inclusion of DHEA/prasterone and ospemifene were also important, especially since the latter is “underutilized in breast cancer patients.”

The information provided on CO₂ laser therapy, however, was problematic, Dr. Streicher said, given that long-term and randomized, controlled studies have now been published. Dr. Streicher also noted that two of the devices listed on the presentation slide, Thermiva and Voltiva, are radiofrequency, not laser devices.

Aside from these treatment options, the most consistent predictor of satisfying sexual experiences in women with breast cancer is the quality of their relationships, Dr. Keyser said, so couples counseling is recommended, and treatments in general are more effective with regularly sexual activity.

In discussing nonhormonal options for treating vasomotor symptoms, Dr. Keyser recommended venlafaxine, gabapentin, and low-dose paroxetine (though SSRIs and tamoxifen are contraindicated since they may reduce tamoxifen’s efficacy).

These are all off label, Dr. Streicher said it was important to note, and she would have liked to have seen a mention of the development of KNdy neurokinin disrupters along with a more in-depth discussion about which lifestyle modifications and botanicals have been shown in randomized, controlled trials to mitigate vasomotor symptoms.

Dr. Keyser wrapped up with a few additional notes and takeaways:

• The only safe reversible long-term option for contraception in HR-positive breast cancer survivors is the Paraguard IUD.
• It’s important to discuss fertility with breast cancer patients and survivors since a majority report unmet needs in this area.
• Patients taking tamoxifen need to be sure to report any vaginal spotting or bleeding since it increases risk of endometrial cancer in postmenopausal women.
• Screen for depression and anxiety.
• Ask women about sexual health and hot flashes.
• Ensure that they’re getting bone screening.
• A recommended resource is Living Beyond Breast Cancer.

Dr. Keyser had no disclosures. Dr. Streicher has consulted for Astellas Pharma and Church & Dwight, and she owns investments in InControl Medical and Sermonix Pharmaceuticals.