Hot flashes in breast cancer survivors

Measuring symptoms and toxicities: a 35-year experience

PURPOSE

When conducting trials aimed at the improvement of cancer-related and/or cancer treatment-related toxicities, it is important to determine the best means of measuring patients' symptoms.

METHODS

The authors of this current manuscript have an extensive experience with the conduct of symptom-control clinical trials. This experience is utilized to provide insight into the best means of measuring symptoms caused by cancer and/or cancer therapy.

RESULTS

Patient-reported outcome data are preferable for measuring bothersome symptoms, for determining toxicities caused by treatment approaches, and offer more accurate and detailed information compared with health care practitioners recording their impressions of patient experiences. Well-validated patient friendly measures are recommended when they are available. When such are not readily available, face-valid, single-item numerical rating scales are effective instruments to document both treatment trial outcomes and cancer treatment side effects/toxicities.

CONCLUSION

The use of numerical rating scales are effective means of measuring symptoms caused by cancer, by cancer treatments, and/or alleviated by symptom control treatment approaches.

Medicinal Herbs Used in Traditional Management of Breast Cancer: Mechanisms of Action

Background: Breast cancer is one of the principal causes of death among women and there is a pressing need to develop novel and effective anti-cancer agents. Natural plant products have shown promising results as anti-cancer agents. Their effectiveness is reported as decreased toxicity in usage, along with safety and less recurrent resistances compared with hormonal targeting anti-cancer agents. Methods: A literature search was conducted for all English-language literature published prior to June 2020. The search was conducted using electronic databases, including PubMed, Embase, Web of Science, and Cochrane Library. The search strategy included keywords such as breast cancer, herbs, anti-cancer biologically active components, clinical research, chemotherapy drugs amongst others. Results: The literature provides documented evidence of the chemo-preventative and chemotherapeutic properties of Ginseng, garlic (Allium sativum), Black cohosh (Actaea racemose), Tumeric (Curcuma longa), Camellia sinenis (green tea), Echinacea, Arctium (burdock), Flaxseed (Linum usitatissimum) and Black Cumin (Nigella sativa). Conclusions: The nine herbs displayed anti-cancer properties and their outcomes and mechanisms of action include inhibition of cell proliferation, angiogenesis and apoptosis as well as modulation of key intracellular pathways. However, more clinical trials and cohort human studies should be conducted to provide key evidence of their medical benefits.

Adjuvant endocrine therapy in women with oestrogen-receptor-positive breast cancer: how should the skeletal and vascular side effects be assessed and managed?

Adjuvant endocrine therapy provides oncological benefits in women with early oestrogen-receptor-positive breast cancer, but has adverse effects consequent to induced oestradiol deficiency. Bone loss is accelerated, predisposing to increased fracture risk. Metabolic effects include changes in lipid metabolism and body composition although effects on cardiovascular risk are still unclear. Women commencing endocrine therapy should be proactively counselled about and monitored for these and other therapy-related complications including arthralgia and vasomotor symptoms. We provide strategies for prevention and management of these adverse effects, based, where available, on randomized controlled trial evidence specific to breast cancer survivors receiving endocrine treatment.

Menopausal symptoms among breast cancer patients: a potential indicator of favorable prognosis

Menopausal symptoms have been suggested to be an indicator of better prognosis among patients treated for breast cancer, because women who experience these symptoms usually have a lower level of estrogen. We tested this hypothesis in a population-based, prospective cohort study involving 4,842 women with stage 0 to III primary breast cancer who were enrolled in the Shanghai Breast Cancer Survival Study between March 2002 and April 2006, were aged 20 to 75 years, and were recruited 6 months post-diagnosis. They were followed-up by in-person surveys and record linkages with the vital statistics registry. Cox regression analysis was used to evaluate the association of menopausal symptoms at baseline with breast cancer recurrence. Approximately 56% of patients experienced at least one menopausal symptom, including hot flashes, night sweats, and/or vaginal dryness at baseline. During a median follow-up period of 5.3 years, 720 women had a recurrence. Experiencing hot flashes or having ≥2 menopausal symptoms was associated with lower risk of recurrence among premenopausal women (hazard ratio [HR]=0.77, 95% confidence interval [CI]: 0.62-0.96 for hot flashes; 0.73, 0.56-0.96 for ≥2 menopausal symptoms). Lower recurrence risk in relation to hot flashes was also observed among women who were not overweight/obese (HR=0.78, 95% CI: 0.64-0.99), those with relatively low waist-to-hip ratio (WHR) (HR=0.77, 95% CI: 0.61-0.97), and those who used tamoxifen (HR=0.75, 95% CI: 0.58-0.98). Consistently experiencing multiple menopausal symptoms was associated with lower recurrence risk among women with low WHR or who used tamoxifen. This large, population-based cohort study of women with breast cancer confirms that experiencing menopausal symptoms is an indicator of favorable breast cancer prognosis.

Managing the side effects of oral aromatase inhibitors

SUMMARY Aromatase inhibitors (AIs) are increasingly being used to treat postmenopausal estrogen receptor-positive breast cancer. In the short term they enhance or induce menopausal symptoms that compromise AI adherence, while in the long-term they adversely affect bone and probably also cardiovascular health, although this is mainly when compared to tamoxifen, which is cardioprotective. The distinct decrease in estrogen levels following AI administration is believed to be the main reason for the emergence of these side effects, although exact mechanisms remain to be elucidated. As such, management strategies to meet these AI-induced toxicities are still mainly symptomatic. In this review, current treatment options and promising new modalities under research will be discussed.

Management of hot flashes in women with breast cancer

Hormone-suppression therapies are used for the treatment of breast cancer in the adjuvant and metastatic settings alike. However, side effects-including hot flashes-are frequently reported by patients as a cause of therapy discontinuation. This paper presents an overview of hormonal therapies and the evidence-based management options for hot flashes, summarized in a treatment algorithm.

Management of menopause-associated vasomotor symptoms: Current treatment options, challenges and future directions

Hot flashes are one of the most common and distressing symptoms associated with menopause, occurring in more than 75% of postmenopausal women. They are especially problematic in breast cancer patients since some breast cancer therapies can induce hot flashes. For mild hot flashes, it is proposed that behavioral modifications are the first step in management. Hormonal therapies, including estrogens and progestogens, are the most well known effective agents in relieving hot flashes; however, the safety of these agents is controversial. There is an increasing amount of literature on nonhormonal agents for the treatment of hot flashes. The most promising data regard newer antidepressant agents such as venlafaxine, which reduces hot flashes by about 60%. Gabapentin is another nonhormonal agent that is effective in reducing hot flashes. While many complimentary therapies, including phytoestrogens, black cohosh, and dehydroepiandrosterone, have been explored for the treatment of hot flashes; none can be recommended at this time. Furthermore, there is a lack of strong evidence to support exercise, yoga, or relaxation for the treatment of hot flashes. Paced respirations and hypnosis appear to be promising enough to warrant further investigation. Another promising nonpharmacological therapy, currently under investigation, involves a stellate ganglion block.

Safety of alternative treatments for menopausal symptoms after breast cancer: a qualitative systematic review

AIM

This qualitative review analyzes systematically the safety of drugs used to alleviate menopausal symptoms, other than hormone replacement therapy, in breast cancer patients.

METHODS

We searched systematically studies using tibolone, serotonin reuptake inhibitors, clonidine, veralipride, gabapentin, black cohosh and phytoestrogens in breast cancer patients. We selected five studies for which we evaluated the methodology, characteristics of the studied populations, outcomes in terms of mortality and recurrence rates.

RESULTS

Four trials were conducted using tibolone in breast cancer patients: one double-blind, randomized trial, one prospective controlled study, and two uncontrolled studies. They considerably lack power to detect any difference in breast cancer recurrence or mortality between the treated and control patients. Similar conclusions have to be drawn from the only controlled retrospective study analyzing the safety of antidepressants and antihistamines. We were unable to find studies reporting the safety of the other drugs in breast cancer patients.

CONCLUSIONS

There are no valuable data indicating the absence of a harmful effect of drugs used to alleviate climacteric symptoms in breast cancer patients. There is a need for randomized trials to assess the safety of these drugs. In the meantime, patients should be informed about the absence of safety data.

A survey among breast cancer survivors: treatment of the climacteric after breast cancer

AIM

To evaluate the prevalence and type of menopausal treatments used by breast cancer survivors. To assess factors that impaired the quality of life of these patients.

MATERIAL AND METHODS

A questionnaire assessing quality of life was sent to 325 breast cancer patients. A 66% valid response rate was obtained. Among these responses, 169 women were postmenopausal. The following results concern these patients only.

RESULTS

Forty-five women were using some treatment to alleviate certain menopausal symptoms (26.6%). More than half of the patients used no therapy to alleviate menopausal symptoms, either because they had no symptoms (n = 43; 25.4%), they feared breast cancer recurrence (n = 24; 14.2%), they were advised not to use a treatment (n = 27; 16%), it had been shown to be inefficient (n = 5; 3%), or because of contraindication (n = 3; 1.8%). In this survey, 62.3% of postmenopausal women affected by breast cancer suffered from hot flushes (n = 94), of which half were severe (n = 46). Among women suffering from hot flushes, a third used various products to alleviate their symptoms (n = 30). Younger women suffered more often from vasomotor symptoms than did older women (p < 0.000). Current users of aromatase inhibitors suffered more from sexual disorders than did non-users (p < 0.001). They had more often an unsatisfactory sexual life (p < 0.01), more vaginal dryness (p = 0.01) and a decreased libido (p < 0.02) compared to non-users.

CONCLUSION

More than 50% of postmenopausal women suffered from climacteric symptoms such as hot flushes, but few were taking a treatment to alleviate these symptoms.

Black Cohosh: Insights into its Mechanism(s) of Action

The Women's Health Initiative found that combination estrogen and progesterone hormone replacement therapy increases breast cancer and cardiovascular disease risk, which compelled many women to seek herbal alternatives such as black cohosh extract (BCE) to relieve their menopausal symptoms. While several clinical trials document the efficacy of BCE in alleviating menopausal symptoms, preclinical studies to determine how BCE works have yielded conflicting results. Part of this is because there is not a universally accepted method to standardize the dose of black cohosh triterpenes, the presumed active ingredients in the extract. Although the mechanism by which BCE relieves symptoms is unknown, several hypotheses have been proposed: it acts 1) as a selective estrogen receptor modulator, 2) through serotonergic pathways, 3) as an antioxidant, or 4) on inflammatory pathways. We found that while the most prominent triterpene in BCE, 23-epi-26-deoxyactein, suppresses cytokine-induced nitric oxide production in brain microglial cells, the whole BCE extract actually enhanced this pathway. A variety of activities have been reported for black cohosh and its compounds, but the absorption and tissue distribution of these compounds is unknown.

Role of androgens, progestins and tibolone in the treatment of menopausal symptoms: a review of the clinical evidence

Estrogen-containing hormone therapy (HT) is the most widely prescribed and well-established treatment for menopausal symptoms. High quality evidence confirms that estrogen effectively treats hot flushes, night sweats and vaginal dryness. Progestins are combined with estrogen to prevent endometrial hyperplasia and are sometimes used alone for hot flushes, but are less effective than estrogen for this purpose. Data are conflicting regarding the role of androgens for improving libido and well-being. The synthetic steroid tibolone is widely used in Europe and Australasia and effectively treats hot flushes and vaginal dryness. Tibolone may improve libido more effectively than estrogen containing HT in some women. We summarize the data from studies addressing the efficacy, benefits, and risks of androgens, progestins and tibolone in the treatment of menopausal symptoms.

The Experience of Hot Flushes After Breast Cancer

As survival from breast cancer increases, there is a corresponding rise in the number of women living with the long-term consequences of its treatment. Distressing menopausal hot flushes occur in many of these women. This article reports on interviews conducted with 8 women, exploring the experience of hot flushes after breast cancer. Women's accounts of hot flushes varied from being a mild sensation to an intensely unpleasant sensation affecting the whole body and accompanied by drenching perspiration. Flushes affected all aspects of the women's lives, including sleeping, clothing, social situations, intimate relationships, and ability to work. Emotionally, women talked about being out of control. Having cancer and menopause simultaneously made it more difficult for the women to cope, and cancer treatment could cause flushing. The women used many strategies to help relieve their difficulties. Some resorted to hormone replacement therapy, whereas others turned to herbal medications and other alternative interventions such as acupuncture. Most women adopted behavioral strategies to try to regain control. Ultimately, they found that control was gained by attitude of mind. Cognitive behavioral techniques may enhance the sense of control and contribute to coping during hot flushes.

Levetiracetam for the treatment of hot flashes: a phase II study

GOALS OF WORK

The objectives of this pilot trial were to assess the potential efficacy and safety of levetiracetam for the treatment of hot flashes, a major cause of morbidity among breast cancer survivors.

PATIENTS AND METHODS

Women, aged 18 years or more, with a history of breast cancer or those who wished to avoid estrogen because of a perceived increased risk of breast cancer, who were experiencing bothersome hot flashes (more than or equal to 14 times per week, for more than or equal to 1 month before study entry), were included. During the baseline week, general demographic characteristics, hot flash information, and quality of life data were obtained. At the beginning of week 2, patients were started on levetiracetam for a total of 4 weeks. Information about hot flashes, quality of life, and toxicity were collected during these 4 weeks and compared with the baseline week.

MAIN RESULTS

After treatment with levetiracetam for 4 weeks (N = 19), mean hot flash scores (frequency times mean severity) were reduced by 57%, and mean hot flash frequencies were reduced by 53%, compared to the baseline week; both these reductions were greater than what would be expected with a placebo (20-25% reduction). There were significant improvements in abnormal sweating (p = 0.004), hot flash distress (p = 0.0002), and satisfaction of hot flash control (p = 0.0001), when comparing data from the fourth week of treatment to the baseline week. Twenty-nine percent of the subjects did not complete the study because of treatment-related adverse events, with the most frequently reported side effects being somnolence, fatigue, and dizziness, usually with mild to moderate intensity.

CONCLUSION

The results of this pilot trial suggest that levetiracetam might be an effective therapy for the treatment of hot flashes. Further data are needed to test this hypothesis, evaluating the efficacy and toxicity of this agent.

Depression and anxiety

Anxiety and depression are common in patients with cancer and in palliative care settings. These symptoms can be reactive to the illness or can be related to the direct physiologic effects of the disease or to drug therapies. Effective treatment of these symptoms includes both psychopharmacologic and psychotherapeutic approaches. The newer antidepressants, anxiolytics, and hypnotics are better tolerated and can be continued safely if necessary, or they can be reduced and discontinued as symptoms improve.

Small optic cup sizes among women using tamoxifen: assessment with scanning laser ophthalmoscopy

PURPOSE

There is a substantial literature showing that the selective estrogen receptor modulator tamoxifen can block swelling-activated chloride channels, such as those in astrocytes. This study aimed to test the hypothesis that anatomic characteristics consistent with swelling may be measured within the optic nerve head (ONH) of tamoxifen users whose ONH appearance is considered within normal limits.

METHODS

Indices of ONH topography were measured using the Heidelberg Retina Tomograph II (HRT) for two populations of women ages 40-69 years: (1) subjects using tamoxifen (20 mg/day) as adjuvant therapy after successful primary treatment for breast cancer and (2) control subjects not using any hormonal medication. All subjects had excellent visual acuity (with 20/20 or better in the test eye), and all appeared to be free of eye disease, as based on conventional photographic assessment. The study design was cross-sectional. The various ONH indices were assessed as functions of the duration of tamoxifen use.

RESULTS

The optic cups of short-term tamoxifen users (<or=2 years) were significantly smaller in both the lateral and axial directions than the optic cups of the control subjects. Of the 27 short-term users, 23 had cup volumes smaller than the median value for the control subjects. The cup sizes of long-term users (> 2 years, <or=5 years) were not distinguishable from those of the control subjects. The presence of small cups among short-term users did not depend on subjects' medical histories prior to tamoxifen use. Disk margin indices were not related significantly to the duration of tamoxifen use.

CONCLUSIONS

Small cup sizes consistent with localized subclinical swelling are not rare among short-term tamoxifen users. Thus, small cups are not likely to be a manifestation of a cumulative-dose toxicity. Instead, they probably result from other causes, possibly involving the action of tamoxifen on estrogen receptors. Further investigation with longitudinal and interventional methodologies is needed to definitively interpret the results.

State of the science: hot flashes and cancer. Part 2: management and future directions

PURPOSE/OBJECTIVES

To critically evaluate and synthesize intervention research related to hot flashes in the context of cancer and to identify implications and future directions for policy, research, and practice.

DATA SOURCES

Published, peer-reviewed articles and textbooks; editorials; and computerized databases.

DATA SYNTHESIS

Although a variety of pharmacologic and nonpharmacologic treatments are available, they may not be appropriate or effective for all individuals.

CONCLUSIONS

The large and diverse evidence base and current national attention on hot flash treatment highlight the importance of the symptom to healthcare professionals, including oncology nurses.

IMPLICATIONS FOR NURSING

Using existing research to understand, assess, and manage hot flashes in the context of cancer can prevent patient discomfort and improve the delivery of evidence-based care.

Treatment of menopausal symptoms: what shall we do now?

During the past few years, many women and doctors have revised their opinions of hormone replacement therapy (HRT) for menopausal symptoms, and a substantial number of individuals have discontinued its use because of concerns about side-effects. Numerous alternatives to HRT are promoted, and assessment of the quality of evidence about the safety and effectiveness of these compounds can be difficult. In this Review, we summarise the data from studies addressing the efficacy, risks, and benefits of frequently prescribed treatments, and offer evidence-based clinical guidelines for the management of menopausal symptoms. Although few comparative studies exist, oestrogen alone or combinations of oestrogen and progestagen are likely to be the most effective treatments for menopausal hot flushes and vaginal dryness. Tibolone is as effective as HRT, however, and might also improve libido. For those who wish to avoid hormonal treatments, there are few effective options. Selective serotonin reuptake inhibitors might be effective in the very short term (less than 12 weeks) and are well tolerated. There is not enough evidence that any of the complementary therapies available are any better than placebo for menopausal vasomotor symptoms, and few safety data exist.