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Annals of Internal Medicine | 2007

Effects of the Phytoestrogen Genistein on Bone Metabolism in Osteopenic Postmenopausal Women: A Randomized Trial

Herbert Marini; Letteria Minutoli; Francesca Polito; Alessandra Bitto; Domenica Altavilla; Marco Atteritano; Agostino Gaudio; Susanna Mazzaferro; Alessia Frisina; Nicola Frisina; Carla Lubrano; Michele Bonaiuto; Rosario D'Anna; Maria Letizia Cannata; Francesco Corrado; Elena Bianca Adamo; Steven Wilson; Francesco Squadrito

Context Women seeking alternative treatments to preserve bone often use phytoestrogens, but evidence of their effectiveness is lacking. Phytoestrogens are found in soy products. Genistein is a phytoestrogen with a structure similar to that of 17-estradiol. Contribution This randomized trial compared genistein, 54 mg/d, with placebo for 24 months in 389 osteopenic postmenopausal women. Increases in bone mineral density were greater with genistein than with placebo. Genistein also had favorable effects on markers of bone metabolism. Genistein did not increase endometrial thickness, but it did cause gastrointestinal side effects. Implications Genistein appears to have a favorable effect on markers of bone health in osteopenic postmenopausal women. Studies of its effect on fractures are needed. The Editors Postmenopausal osteoporosis is caused by a sharp decrease in estrogen levels that leads to an increased rate of bone remodeling (13). Currently available treatments for postmenopausal osteoporosis include hormone replacement therapy; calcitonin; bisphosphonates; and selective estrogen receptor modulators, such as raloxifene (4, 5). Although hormone replacement therapy is effective in reducing postmenopausal bone loss (68), it is associated with a higher risk for breast, endometrial, and ovarian cancer; cardiovascular disease; venous thromboembolism; and stroke (810). Epidemiologic data indicate that women who ingest high amounts of phytoestrogens, particularly isoflavones in soy products, have less risk for osteoporosis than do those who consume a typical Western diet (1113). Consequently, many women use phytoestrogens to maintain bone density. Genistein, an isoflavone phytoestrogen that is abundant in soybean products, structurally resembles 17-estradiol (14). As a natural selective estrogen receptor modulator, genistein may positively regulate bone cell metabolism without harmful estrogenic activity in the breast and uterus. This safe profile results from the greater affinity of genistein for estrogen receptor-, which is more abundant in bone, than for estrogen receptor-, which is abundant in reproductive tissue. Observational studies suggest that postmenopausal Asian women who consume diets high in isoflavones have a lower rate of fracture than that in other groups (15, 16). However, the mechanism of action of genistein on bone is not yet fully understood. In postmenopausal women, treatment with genistein (54 mg/d) increased bone mineral density (BMD) at the lumbar spine and femoral neck with no clinically significant adverse effects on the breast and uterus (17). In the same cohort, genistein decreased the ratio of soluble receptor activator of nuclear factor-B ligand to osteoprotegerin, which may partly account for its positive effects on BMD (18). These investigations were the first to evaluate the effects of purified, standardized genistein on bone health, but they were short in duration and included only 90 patients. One published trial assessed the effect of isoflavones on BMD in postmenopausal women, but it compared isoflavone-rich soy milk (containing only a small amount of genistein) with natural transdermal progesterone (19). Other studies of pure genistein from our research group have focused on cardiovascular outcomes or menopausal symptoms rather than on bone health (2022). We performed a randomized, placebo-controlled trial of the effects of pure genistein on bone density and bone metabolism over 24 months in a larger cohort of osteopenic postmenopausal women. Methods Design and Setting The study protocol is consistent with the principles of the Declaration of Helsinki, and participants gave written informed consent. Participants were recruited from women reporting to the Center for Osteoporosis in the Department of Internal Medicine and the Center for Menopause in the Department of Obstetrical and Gynecological Sciences, University of Messina (Messina, Italy), and to the Department of Medical Physiopathology, University La Sapienza (Rome, Italy). Three hundred eighty-nine women met the inclusion criteria and agreed to participate (Figure 1). Figure 1. Study flow diagram. Participants Participants were women 49 to 67 years of age who had been postmenopausal for at least 12 months at baseline, were in good general health, had not had a menstrual period in the preceding year, had not undergone surgically induced menopause, and had a follicle-stimulating hormone level greater than 50 IU/L and a serum 17-estradiol level of 100 pmol/L or less (27 pg/mL). At the start of the study, a complete family history was obtained, physical examination and laboratory evaluation (chemical analytes and hematologic measurements) were performed, and BMD was measured at the lumbar spine and femoral neck. Exclusion criteria were clinical or laboratory evidence of confounding systemic diseases, such as cardiovascular, hepatic, or renal disorders; coagulopathy; use of oral or transdermal estrogen, progestin, androgens, selective estrogen receptor modulators, or other steroids; use of biphosphonates, cholesterol-lowering therapy, or cardiovascular medications (including antihypertensive drugs) in the preceding 6 months; smoking habit of more than 2 cigarettes daily; treatment in the preceding year with any drug that could have affected the skeleton; family history of estrogen-dependent cancer; and BMD at the femoral neck greater than 0.795 g/cm2 (which corresponds to a T-score of 1.0 SD). Randomization and Intervention We assigned patients to groups by using a computer-generated randomization sequence with a permuted block size of 4, stratified by center. After a 4-week stabilization period during which participants received a standard low-soy, reduced-fat diet, participants were assigned to receive genistein (n= 198), 54 mg/d in 2 tablets (Laboratori Plants, Messina, Italy), or placebo (n= 191) (Figure 1). The biological effects of phytoestrogen intake are described elsewhere (23). No patient withdrew from the study during the stabilization period. The purity of genistein was 98%. Placebo and genistein tablets were identical in appearance and taste. Both genistein and placebo tablets contained calcium carbonate (500 mg) and vitamin D (400 IU). All participants were counseled on an isocaloric, reduced-fat diet composed of 25% to 30% energy from fat, less than 10% energy from saturated fatty acids, 55% to 60% energy from carbohydrates, and 15% energy from protein, with a cholesterol intake less than 300 mg/d and fiber intake of 35 g/d or greater. Recommended daily caloric intake was based on body size and was calculated by using the HarrisBenedict equation. We used this diet during the stabilization period to ensure that all participants had the same energy intake and to avoid interference with the lipid profile. The intake of soy products, legumes, or other nutrient supplements was prohibited. The isoflavone intake before randomization, as assessed by using a food-frequency questionnaire, was 1 to 2 mg/d. This intake has been shown to be typical in Western populations (24). Participants used this diet throughout the study, and adherence was reinforced by a nutritionist. Diet and body mass index were evaluated in all participants during follow-up. Primary Outcome The BMD at the anteroposterior lumbar spine and femoral neck was measured by using dual-energy x-ray absorptiometry (Hologic QDR 4500 W, Technologic, Turin, Italy) at baseline and after 12 and 24 months of treatment. The instrument was calibrated daily according to the manufacturers instructions. Reproducibility was calculated as a coefficient of variation obtained by weekly measurements of a standard phantom on the instrument and by repeated measurements obtained in 3 patients of different ages. The coefficient of variation of our instrument is 0.5% with the standard phantom; in vivo, we calculated a coefficient of variation of 1.1% for the lumbar spine and 1.5% for the femoral neck. Secondary Outcomes Bone Resorption Markers At baseline, 12 months, and 24 months, a 2-hour fasting morning urine sample was collected at the same time of day to assess urinary excretion of pyridinium crosslinks (pyridinoline and deoxypyridinoline). Pyridinoline (normal range, 26 to 91 pmol/mol creatinine) and deoxypyridinoline (normal range, 3 to 21 pmol/mol creatinine) were measured by using high-performance liquid chromatography (Bio-Rad Laboratories, Hercules, California). Bone Formation and Bone Growth Markers and Other Variables After an overnight fast, venous blood samples were collected between 8 a.m. and 9 a.m. through a polyethylene catheter inserted in a forearm vein. The serum was separated from the blood corpuscles by centrifugation and kept frozen at 70C until analysis for bone formation and bone growth markers, calcium, intact parathyroid hormone, 25-hydroxyvitamin D3, 17-estradiol, follicle-stimulating hormone, total cholesterol, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, and triglycerides. Serum bone-specific alkaline phosphatase (normal range, 8.5 to 17.9 g/L) and insulin-like growth factor I (normal range, 9.6 to 21.2 nmol/L) were measured by using an immunoenzymatic assay (Pantec, Turin, Italy). Serum calcium (normal range, 2.25 to 2.75 mmol/L [9 to 11 mg/dL]), serum phosphorus (normal range, 1.13 to 1.45 mmol/L [3.5 to 4.5 mg/dL]), and urinary creatinine (130 to 220 molkg1d1 [14.71 to 24.89 mg/kg of body weight per day]) were measured by using automated routine procedures. Parathyroid hormone (normal range, 12 to 100 pg/dL), 25-hydroxyvitamin D3 (normal range, 1.25 to 7.5 nmol/L), and follicle-stimulating hormone (normal range, 21 to 153 IU/L in the postmenopausal phase) were measured by using high-performance liquid chromatography (Bio-Rad Laboratories). 17-Estradiol (normal range, 37 to 110 pmol/L in the postmenopausal phase) was evaluated by using a solid-phase immunoassay (Roche Diagnostics, Monza, Italy). Total cholesterol,


Menopause | 2007

Effects of the phytoestrogen genistein on hot flushes, endometrium, and vaginal epithelium in postmenopausal women: a 2-year randomized, double-blind, placebo-controlled study.

Rosario D'Anna; Maria Letizia Cannata; Herbert Marini; Marco Atteritano; Francesco Cancellieri; Francesco Corrado; Onofrio Triolo; P. Rizzo; Silvia Russo; Agostino Gaudio; Nicola Frisina; Alessandra Bitto; Francesca Polito; Letteria Minutoli; Domenica Altavilla; Elena Bianca Adamo; Francesco Squadrito

Objective: To evaluate in a 24-month, prospective, randomized, double-blind, placebo-controlled study whether pure administration of the phytoestrogen genistein (54 mg/d) might reduce the number and severity of hot flushes in postmenopausal women, with no adverse effect on the endometrium and vagina. Methods: A total of 389 participants met the parent study criteria and were randomly assigned to receive the phytoestrogen genistein (n = 198) or placebo (n = 191). About 40% of participants in both groups did not experience hot flushes, and the evaluation was performed in a subgroup of 236 participants (genistein, n = 119; placebo, n = 117). Reductions from the baseline in the frequency and severity of hot flushes were the principal criteria of efficacy. Endometrial thickness was evaluated by ultrasonography. The maturation value was also used to determine hormonal action on the vaginal cells. Results: There were no significant differences in vasomotor symptoms between groups at the baseline (4.4 ± 0.33 hot flushes per day in the genistein group and 4.2 ± 0.35 hot flushes per day in the control group). After 12 months of genistein therapy, there was a significant reduction (−56.4%) in the mean number of hot flushes, with a significant difference compared with the control group. After 24 months, there was no further decrease in the number of hot flushes in both groups. No significant difference was found in mean endometrial thickness and the maturation value score between the two groups, either at the baseline or after 24 months. Conclusions: The phytoestrogen genistein has been shown to be effective on vasomotor symptoms without an adverse effect on the endometrium and vagina, but after the first year, there was no further improvement in the decrease in hot flushes.


The Journal of Clinical Endocrinology and Metabolism | 2008

Breast Safety and Efficacy of Genistein Aglycone for Postmenopausal Bone Loss: A Follow-Up Study

Herbert Marini; Alessandra Bitto; Domenica Altavilla; Bruce P. Burnett; Francesca Polito; Vincenzo Di Stefano; Letteria Minutoli; Marco Atteritano; Robert M. Levy; Rosario D'Anna; Nicola Frisina; Susanna Mazzaferro; Francesco Cancellieri; Maria Letizia Cannata; Francesco Corrado; Alessia Frisina; Vincenzo Adamo; Carla Lubrano; Carlo Sansotta; Rolando Marini; Elena Bianca Adamo; Francesco Squadrito

CONTEXT Genistein aglycone improves bone metabolism in women. However, questions about the long-term safety of genistein on breast as well as its continued efficacy still remain. OBJECTIVE We assessed the continued safety profile of genistein aglycone on breast and endometrium and its effects on bone after 3 yr of therapy. DESIGN The parent study was a randomized, double-blind, placebo-controlled trial involving 389 osteopenic, postmenopausal women for 24-months. Subsequently, a subcohort (138 patients) continued therapy for an additional year. PATIENTS AND INTERVENTIONS Participants received 54 mg of genistein aglycone daily (n = 71) or placebo (n = 67). Both treatment arms received calcium and vitamin D(3) in therapeutic doses. MAIN OUTCOMES Mammographic density was assessed at baseline, 24 and 36 months by visual classification scale and digitized quantification. BRCA1 and BRCA2, sister chromatid exchange, and endometrial thickness were also evaluated. Lumbar spine and femoral neck bone mineral density were also assessed. Secondary outcomes were biochemical levels of bone markers. RESULTS After 36 months, genistein did not significantly change mammographic breast density or endometrial thickness, BRCA1 and BRCA2 expression was preserved, whereas sister chromatid exchange was reduced compared with placebo. Bone mineral density increases were greater with genistein for both femoral neck and lumbar spine compared to placebo. Genistein also significantly reduced pyridinoline, as well as serum carboxy-terminal cross-linking telopeptide and soluble receptor activator of NF-kappaB ligand while increasing bone-specific alkaline phosphatase, IGF-I, and osteoprotegerin levels. There were no differences in discomfort or adverse events between groups. CONCLUSIONS After 3 yr of treatment, genistein exhibited a promising safety profile with positive effects on bone formation in a cohort of osteopenic, postmenopausal women.


Diabetes Care | 2013

myo-Inositol Supplementation and Onset of Gestational Diabetes Mellitus in Pregnant Women With a Family History of Type 2 Diabetes: A prospective, randomized, placebo-controlled study

Rosario D’Anna; Angela Scilipoti; Domenico Giordano; Carmela Caruso; Maria Letizia Cannata; Maria Lieta Interdonato; Francesco Corrado; Antonino Di Benedetto

OBJECTIVE To check the hypothesis that myo-inositol supplementation may reduce gestational diabetes mellitus (GDM) onset in pregnant women with a family history of type 2 diabetes. RESEARCH DESIGN AND METHODS A 2-year, prospective, randomized, open-label, placebo-controlled study was carried out in pregnant outpatients with a parent with type 2 diabetes who were treated from the end of the first trimester with 2 g myo-inositol plus 200 µg folic acid twice a day (n = 110) and in the placebo group (n = 110), who were only treated with 200 µg folic acid twice a day. The main outcome measure was the incidence of GDM in both groups. Secondary outcome measures were as follows: the incidence of fetal macrosomia (>4,000 g), gestational hypertension, preterm delivery, caesarean section, shoulder dystocia, neonatal hypoglycemia, and neonatal distress respiratory syndrome. GDM diagnosis was performed according to the International Association of the Diabetes and Pregnancy Study Groups (IADPSG) recommendations. RESULTS Incidence of GDM was significantly reduced in the myo-inositol group compared with the placebo group: 6 vs. 15.3%, respectively (P = 0.04). In the myo-inositol group, a reduction of GDM risk occurrence was highlighted (odds ratio 0.35). A statistically significant reduction of fetal macrosomia in the myo-inositol group was also highlighted together with a significant reduction in mean fetal weight at delivery. In the other secondary outcome measures, there were no differences between groups. CONCLUSIONS myo-Inositol supplementation in pregnant women with a family history of type 2 diabetes may reduce GDM incidence and the delivery of macrosomia fetuses.


Journal of Bone and Mineral Research | 2008

OPG and sRANKL Serum Concentrations in Osteopenic, Postmenopausal Women After 2‐Year Genistein Administration

Herbert Marini; Letteria Minutoli; Francesca Polito; Alessandra Bitto; Domenica Altavilla; Marco Atteritano; Agostino Gaudio; Susanna Mazzaferro; Alessia Frisina; Nicola Frisina; Carla Lubrano; Michele Bonaiuto; Rosario D'Anna; Maria Letizia Cannata; Francesco Corrado; Francesco Cancellieri; Marianna Faraci; Rolando Marini; Elena Bianca Adamo; Steven Wilson; Francesco Squadrito

Introduction: RANKL and its decoy receptor osteoprotegerin (OPG) constitute a complex physiological mediator system involved in the regulation of bone resorption and may be responsible for the homeostatic mechanism of normal bone remodeling. Genistein, an isoflavone representing 1–5% of total phytoestrogen content in soybean products, may positively regulate cellular bone metabolism, but its mechanism of action on bone is not yet fully understood.


Nutrition Metabolism and Cardiovascular Diseases | 2010

Efficacy of genistein aglycone on some cardiovascular risk factors and homocysteine levels: A follow-up study *

Herbert Marini; Alessandra Bitto; Domenica Altavilla; Bruce P. Burnett; Francesca Polito; V. Di Stefano; Letteria Minutoli; Marco Atteritano; Robert M. Levy; Nicola Frisina; Susanna Mazzaferro; Alessia Frisina; Rosario D'Anna; Francesco Cancellieri; Maria Letizia Cannata; Francesco Corrado; Carla Lubrano; Rolando Marini; Elena Bianca Adamo; Francesco Squadrito

BACKGROUND AND AIM Recent evidence suggests that genistein aglycone may act beneficially on surrogate cardiovascular risk markers in postmenopausal women. We assessed the effects of genistein aglycone on some cardiovascular risk factors and homocysteine levels after 3-years of continued therapy in a cohort of osteopenic, postmenopausal women. METHODS AND RESULTS The parent study was a randomized, double-blind, placebo-controlled trial involving 389 postmenopausal women with low bone mass for 24 months. Subsequently, a subcohort (138 patients) continued therapy for an additional year. Participants received 54mg of genistein aglycone (n=71) or placebo (n=67), daily. Both arms received calcium and vitamin D(3) in therapeutic doses. Moreover, 4 weeks before randomization procedures and during our follow-up study, all patients received dietary instructions in an isocaloric fat-restricted diet. Blood lipid profiles, fasting glucose and insulin, insulin resistance (HOMA-IR), fibrinogen, osteoprotegerin (OPG) and homocysteine at baseline and after 24 and 36 months of treatment were measured. Compared to placebo, genistein significantly decreased fasting glucose and insulin, HOMA-IR, fibrinogen and homocysteine after 24 and 36 months of treatment. By contrast, isoflavone administration did not affect high-density lipoprotein cholesterol and triglycerides though serum OPG was higher in the genistein recipients. There were no differences in adverse events or discomfort between groups. Results on routine biochemical, liver function, and hematologic testing did not change over time in placebo or genistein group. CONCLUSIONS After 3-years of treatment, genistein aglycone plus calcium, vitamin D(3) and a healthy diet showed positive effects on some cardiovascular risk factors and homocysteine levels in a cohort of postmenopausal women with low bone mass.


European Journal of Pharmacology | 2008

Effects of phytoestrogen genistein on cytogenetic biomarkers in postmenopausal women: 1 year randomized, placebo-controlled study☆

Marco Atteritano; Francesco Pernice; Susanna Mazzaferro; Stefania Mantuano; Alessia Frisina; Rosario D'Anna; Maria Letizia Cannata; Alessandra Bitto; Francesco Squadrito; Nicola Frisina; Michele Buemi

To evaluate in a twelve-month, randomized placebo-controlled study whether pure administration of phytoestrogen genistein (54 mg/day) might reduce cytogenetic biomarkers in peripheral lymphocytes of postmenopausal women. A total of 57 postmenopausal women met the criteria and were randomly assigned to receive phytoestrogen genistein (n = 30) or placebo (n = 27). There was no significant difference in age, length of time since menopause or body mass index between the two groups. After one year, plasma genistein level was 0.14 +/- 0.01 micromol/L in the control group and 0.72 +/- 0.08 micromol/L in the genistein group (P < 0.0001). At baseline, sister chromatid exchange rate was 4.97 +/- 2.17 in the control group and 4.96 +/- 1.83 in the genistein group (P = 0.89). After one year, sister chromatid exchange rate was 4.96 +/- 2.16 in the control group and 3.98 +/- 1.14 in the genistein group (P < 0.05). High frequency cells count was 3% in the genistein group and 5% in the control group (P < 0.05) at the end of the study. Chromosomal aberration frequency was 5.55% in the control group at time 0 and 5.75% in the genistein group; after one year, the figures were 5.86% in the control group and 4.5% in the genistein group (P < 0.05). After one year, there was a negative relationship between sister chromatid exchange rate and plasma levels (r = - 0.43; P < 0.05) in the genistein group. Phytoestrogen genistein has been shown in postmenopausal women to be effective in the reduction of cytogenetic biomarkers. The protective effect on genomic damage appears to be a particularly promising tool in reducing the risk of cancer.


Diabetes & Metabolism | 2012

Correspondence between first-trimester fasting glycaemia, and oral glucose tolerance test in gestational diabetes diagnosis.

Francesco Corrado; Rosario D’Anna; Maria Letizia Cannata; Maria Lieta Interdonato; Basilio Pintaudi; A. Di Benedetto

AIM To evaluate the correspondence between first-trimester fasting glycaemia and the results of the OGTT in diagnosing gestational diabetes (GDM). METHODS The medical records of all consecutive women who had undergone a diagnostic OGTT, performed according to the IADPSG, during the past year were retrospectively reviewed. All first-trimester fasting glucose values greater or equal to 5.1 mmol/L (92 mg/dL), recommended as a diagnostic value, were also verified for each patient in this cohort. Moreover, a ROC curve and a multiple logistic-regression model were constructed to calculate the predictive capability of this cut-off value in diagnosing GDM. RESULTS In our population of 738 eligible pregnant women, an 11.9% prevalence of GDM was revealed by OGTT. However, when the first-trimester fasting glucose value for each patient was retrospectively considered, there were a further 29 patients who should have been diagnosed as GDM cases (glycaemia ≥ 5.1 mmol/L), although their OGTT was normal. Yet, when the value of fasting glucose was considered not diagnostic, but only predictive, an AUC of 0.614 (95% CI: 0.544-0.684) and an aOR of 7.1 (95% CI: 3.8-13.1) was obtained in these patients compared with the reference group (fasting glucose < 5.1 mmol/L). CONCLUSION There was no complete correspondence in diagnosing GDM between the first-trimester fasting glucose value and the results of a 2-h 75-g OGTT performed early in the third trimester. However, albeit not diagnostic, a fasting glucose value greater or equal to 5.1 mmol/L may be considered a highly predictive risk factor for GDM.


European Journal of Obstetrics & Gynecology and Reproductive Biology | 2002

A randomised trial of progesterone prophylaxis after midtrimester amniocentesis

Francesco Corrado; Corrado Dugo; Maria Letizia Cannata; Massimo Di Bartolo; Angela Scilipoti; Narcisio Carlo Stella

BACKGROUND Midtrimester amniocentesis to investigate fetal karyotype carries a small risk of fetal loss. AIM To test the hypothesis that progesterone prophylaxis may reduce this. STUDY DESIGN A randomised controlled trial comparing a short prophylactic treatment with progesterone after amniocentesis with untreated controls. RESULTS There were no differences in frequency of miscarriage, preterm delivery or neonatal outcome. CONCLUSION Prophylactic progesterone treatment after amniocentesis does not improve obstetric outcome.


Gynecologic and Obstetric Investigation | 2007

Midtrimester Amniotic Fluid Leptin and Insulin Levels and Subsequent Gestational Diabetes

Rosario D’Anna; Giovanni Baviera; Maria Letizia Cannata; Antonio De Vivo; Antonino Di Benedetto; Francesco Corrado

Aims: To evaluate midtrimester amniotic fluid leptin levels in pregnancies subsequently complicated by gestational diabetes. Methods: We studied 32 pregnant women with gestational diabetes and a control group of 43 normal pregnancies with an adequate gestational age fetus. All underwent a midtrimester amniocentesis: leptin and insulin were measured in the amniotic fluid. Data were compared with the Mann-Whitney U-test. Results: Median leptin concentrations in the amniotic fluid of the gestational diabetes mellitus patients were significantly higher than in the control group (15.1 vs. 7.9 ng/ml) (p = 0.001); amniotic insulin concentrations were also higher in the gestational diabetes mellitus than in the control group (0.67 vs. 0.38 µU/ml) (p = 0.02). Furthermore, amniotic fluid leptin levels were directly correlated with amniotic insulin concentrations; instead, there was no correlation with maternal BMI and birth weight. Conclusion: Our data suggest that in pregnancies subsequently complicated by gestational diabetes, amniotic fluid leptin and insulin levels are higher in the early fetal period.

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