Treatment of estrogen-dependent symptoms of postmenopausal HRT should be started only in cases of their adverse effect on the quality of life of women. To assess the ratio of benefits and risks of treatment with the drug, every 3 to 4 months (but at least once every 6 months), taking into account the individual characteristics of the patient, to conduct a medical examination, using clinical and laboratory data. HRT should be continued only as long as the benefits exceed the risk.
Medical examination / control
Before starting / resuming HRT, you should collect an anamnesis and study the patient's medical history, conduct the necessary examination (including pelvic organs and mammary glands), read the contraindications and special precautions for using the drug. Women should be advised to report any changes in the mammary glands to the doctor or nurse for the purpose of timely follow-up, including mammography.
Reasons for immediate withdrawal of treatment
Treatment should be discontinued if there are contraindications and the following conditions:
- Jaundice or liver dysfunction
- Significant increase in blood pressure
- A new attack of a migraine headache
- Pregnancy
Endometrial hyperplasia
With prolonged monotherapy with estrogens, the risk of developing hyperplasia and endometrial carcinoma increases (see also section Side effect). To reduce the risk in women with unoperated uterus, it is necessary to combine therapy with progestogen for at least 12 days during the cycle.
During the first months of treatment with the drug, breakthrough bleeding and spotting can be noted.If such bleeding or discharge occurs some time after initiation of therapy or continues after discontinuation of the drug to determine their cause and exclude malignancy of the endometrium, an endometrial biopsy may be required.
Endometrial cancer
A maximum assessment of the risk of developing endometrial cancer in women not receiving HRT, based on epidemiological studies, shows that approximately 5 out of every 1,000 women aged 50-65 years will have endometrial cancer. Depending on the duration of treatment and the dose of estrogen, the risk of developing endometrial cancer among women receiving HRT with estrogen, without the adverse effect of progestogen, is 2-12 times higher than that of women who have not been accepted HRT.
Mammary cancer
Data from the randomized placebo-controlled study of the Women's Health Initiative (WHI), as well as epidemiological research, including a large-scale study of women's health "Million Women" (MWS), indicate an increased risk of developing breast cancer in women who have had HRT for several years with estrogens,estrogens in combination with progestogens or tibolone (see also section Side effect). The degree of additional risk becomes apparent after several years of HRT use and increases with prolonged treatment. However, the increased risk is reduced to the baseline in a few years (in most cases, after 5 years) after discontinuation of treatment.
In women receiving estrogen replacement monotherapy, the values of the relative risk (RR) of development of breast cancer obtained from a reanalysis of 51 epidemiological studies (in which> 80% of patients received hormone replacement therapy only estrogens) and the results of the epidemiological study "One Million Women" (MWS), are comparable and are 1.35 (95% CI: 1.21-1.49) and 1.30 (95% CI: 1.21-1.40), respectively.
According to several epidemiological studies, the overall risk of developing breast cancer is higher with combined HRT with estrogens and progestogen than with estrogen alone.
The results of the "One Million Women" (MWS) show that when comparing women who never received HRT, patients,(RR = 2.00, 95% CI: 1.88-2.12) than women receiving estrogen alone (RR = 1.30, 95 % CI: 1.21-1.40) or tibolone (RR = 1.45, 95% CI: 1.25-1.68).
According to a study of "Million Women" (MWS) the magnitude of the risk of developing breast cancer after 5.6 years of combined HRT use with estrogen and progestogen (KLE + MPA) is comparable to the placebo group and is 1.24 (95% CI: 1.01-1.54).
The magnitude of the absolute risk of developing breast cancer, calculated from the data of the study "Million women" (MWS) and the project "Women's Health" (WHI), are presented below:
According to a study of "Million Women" (MWS), based on the known average incidence of breast cancer in women in advanced economies:
The expected incidence of breast cancer among women aged 50-64 years who do not take HRT will be 32 out of every 1000 women.
Among women taking HRT now or in the recent past, the number of additional cases of breast cancer in terms of 1000 women for a certain period will be:
Among patients receiving estrogen replacement therapy 0-3 cases per 1000 women (an average of 1.5) with a duration of 5 years of substitution therapy,
3-7 cases per 1000 women (an average of 5) with a duration of therapy of 10 years.
Among patients who received combined HRT with estrogens and progestogen 5-7 cases per 1000 women (mean 6) with a duration of 5 years of replacement therapy,
18-20 cases per 1000 women (an average of 19) with a duration of therapy of 10 years.
According to the study "Women's Health" (WHI), After 5.6 years, the number of additional cases of development of invasive breast cancer in women aged 50-79 years, who had combined HRT with estrogen and progestogen (GLE ± MPA), was 8 cases for every 10,000 patient-years.
Based on the clinical trial, it was calculated that:
Of every 1,000 women in the placebo group After 5 years, approximately 16 women will be diagnosed with invasive breast cancer.
Of every 1000 women who received combined HRT with estrogen and progestogen (CLA + MPA), the number of additional cases of breast cancer will be 0-9 cases (an average of 4) with a duration of 5 years of replacement therapy.
In the study MWS the relative risk of breast cancer was higher when added to therapy with conjugated equine estrogens (EML) orEstradiol (E2), taken both in cyclic and continuous mode, progestogen, and did not depend on the type of progestogen.
Data confirming a significant difference in the incidence of breast cancer, depending on the method of administration of the drug, are absent.
In the study WHI it was found that with the development of breast cancer against a background of continuous replacement therapy with a combined preparation containing conjugated equine estrogens and medroxyprogesterone acetate (KLE + MPA), the neoplasm is somewhat larger and more often metastasizes to the regional lymph nodes, compared with the placebo group.
Against the backdrop of HRT, especially with combined therapy with estrogens and progestogens, the density of the mammogram (mammogram) may increase, which may contradict the radiographic signs of breast cancer.
In general, the number of additional cases of breast cancer in women aged 45-60 years who take combined HRT is comparable to that of women who are just starting HRT and does not depend on the age at which HRT is started.
Venous thromboembolism
HRT is associated with a higher relative risk of venous thromboembolism (VTE) - deep vein thrombosis or pulmonary embolism. In the conducted studies, a 2-3 fold increase in the risk of VTE during HRT was established. It has been established that for 5-year period in non-treated patients, the number of cases of VTE is about 3 per 1000 women aged 50-59 years and 8 per 1000 at the age of 60-69 years. It is estimated that in healthy women who underwent a 5-year course of HRT, the number of additional cases of VTE for 5 years is 2-6 (on average 4) per 1000 women aged 50-59 years and 5-15 (an average of 9 ) per 1,000 women aged 60-69 years. The probability of occurrence of VTE is greater in the first year of HRT than in the following. As a rule, the risk factors for venous thromboembolism include cases of VTE in the anamnesis (including in the immediate family) and the corresponding changes in the coagulogram, significant obesity (body mass index> 30 kg / m), systemic lupus erythematosus. There is no consensus on the possible role of varicose veins in the development of VTE. HRT may increase the risk. It is necessary to analyze all cases of thromboembolism and / or spontaneous abortions in a personal or family anamnesis, to exclude a predisposition to thrombophilia.Until the appropriate examination is carried out, HRT is contraindicated. The appointment of HRT to women taking anticoagulants is only possible taking into account the benefit / risk ratio of HRT use. The risk of VTE may temporarily increase with prolonged immobilization, including due to trauma, surgical intervention, in the postoperative period. When planning operations, it is necessary to consider the desirability of terminating HRT 4-6 weeks prior to intervention in each specific case. Treatment should not be resumed until the coagulogram is normalized and mobility restored. If VTE develops after the start of treatment, HRT should be discontinued. The patient should suspend HRT and immediately inform their attending physician if symptoms such as soreness and / or swelling of the lower limb, sudden chest pain, shortness of breath occur. Cardiac ischemia
Conducted randomized controlled studies did not reveal a reduction in the incidence of cardiovascular disease in the context of continuous combination therapy with conjugated estrogens and medroxyprogesterone acetate (MPA).Data from two large clinical trials (WHI and HERS - "Heart and replacement therapy with estrogen / progesterone") showed a possible increase in the risk of developing cardiovascular diseases during the first year of treatment and the lack of a common clinical advantage. To evaluate other drugs for HRT, there is a limited number of randomized controlled trials; studying the impact on cardiovascular morbidity and mortality. Therefore, it is not clear whether these data also apply to other HRT preparations.
Violation of cerebral circulation / stroke
In a large randomized clinical trial of WHI an increase in the risk of cerebrovascular accident in healthy women with combined HRT (KLE + MPA) has been established. So, in the absence of HRT, the number of cases of cerebral circulation impairment per 1000 women within 5 years was about 3 - at the age of 50-59 years and about 11 - at the age of 60-69 years. For 1000 women who used conjugated estrogens and MPA during. 5 years, the number of additional cases of cerebral circulation disorder ranged from 0 to 3 (on average 1) - at the age of 50-59 years and 1-9 (on average 4) - at the age of 60-69 years. It is not known whether such an increase in risk extends to other HRT preparations.
Ovarian Cancer
According to some epidemiological studies, the use of estrogen in the form of monotherapy or in combination with progestogen for 5-10 years is accompanied by an increased risk of ovarian cancer.
Other states
Estrogens can lead to fluid retention in the body, which can worsen the condition of patients with impaired heart or kidney function. When taking Eviana ® in the terminal stage of renal failure, the level of circulating active components increases.
Also, women with hypertriglyceridemia in the anamnesis are subject to a thorough examination and observation in the HRT process, since in the treatment with estrogens, a significant increase in triglyceride levels in the plasma, leading to pancreatitis, is possible.
Estrogens increase the concentration of thyroxin-binding globulin, which leads to an increase in the total concentration of circulating thyroid hormones, determined by the content of protein-bound iodine, thyroxine (by column chromatography or radioimmunoassay), triiodothyronine (in radioimmunoassay).The concentrations of free thyroxin and triiodothyronine remain unchanged.
Concentrations of other binding proteins of blood serum can be increased, incl. corticoid-binding globulin and globulin binding sex hormones, which leads to an increase in the concentration of circulating corticosteroids and sex hormones. Concentrations of free or biologically active hormones do not change.
The concentration of other plasma proteins, angiotensinogen / renin, alpha1-antitrypsin, ceruloplasmin, can also increase.
There is insufficient evidence to improve cognitive function. Moreover, with behavior WHI - studies showed an increased risk of possible dementia in combination (CLA + MPA) HRT in women over 65 years of age. It is not known whether this applies to other HRT preparations and / or HRT in younger postmenopausal women.
Eviana® contains lactose. Before prescribing this drug to patients with rare hereditary diseases - congenital lactase deficiency, lactose intolerance and glucose-galactose malabsorption, the severity of this condition should be carefully assessed.If the drug is prescribed for such patients, they should be under careful medical supervision.