Flaxseed influences urinary lignan excretion in a dose-dependent manner in postmenopausal women.

Dietary estrogens, such as lignans, are similar in structure to endogenous sex steroid hormones and may act in vivo to alter hormone metabolism and subsequent cancer risk. The objective of this study was to examine the effect of dietary intake of a lignan-rich plant food (flaxseed) on urinary lignan excretion in postmenopausal women. This randomized, cross-over trial consisted of three 7-week feeding periods during which 31 healthy postmenopausal women, ages 52-82 years, consumed their habitual diets plus 0, 5, or 10 grams of ground flaxseed per day. Urine samples collected for 2 consecutive days during the last week of each feeding period were analyzed for lignan content (enterodiol, enterolactone, and matairesinol) by isotope dilution gas chromatography/mass spectrometry. Compared with the 0-gram flaxseed diet, consumption of 5 or 10 grams of flaxseed significantly increased excretion of enterodiol by 1,009 and 2,867 nmol/day, respectively; significantly increased excretion of enterolactone by 21,242 and 52,826 nmol/day, respectively; and significantly increased excretion of total lignans (enterodiol + enterolactone + matairesinol) by 24,333 and 60,640 nmol/day, respectively. Excretion of matairesinol was not significantly altered by flaxseed consumption. Consumption of flax, a significant source of dietary estrogens, in addition to their habitual diets increased excretion of enterodiol and enterolactone, but not matairesinol, in a dose-dependent manner in this group of postmenopausal women. Urinary excretion of lignan metabolites is a dose-dependent biomarker of flaxseed intake within the context of a habitual diet.     

Urinary isoflavonoid and lignan excretion on a Western diet: relation to soy, vegetable, and fruit intake.

Dietary isoflavone and lignan phytoestrogens are potential chemopreventive agents. This has led to a need to monitor exposure to these compounds in human populations and to determine which components of a mixed diet contribute to the exposure. Typically, urinary isoflavonoid excretion is associated with soy consumption and that of lignans is associated with whole grains. However, other plant foods are known to contain phytoestrogen precursors. The purpose of this study was to examine the association between urinary isoflavonoid and lignan excretion and intakes of vegetables and fruits (V&F). Isoflavonoids (genistein, daidzein, O-desmethylangolensin, and equol) and lignans (enterolactone, enterodiol, and matairesinol) were measured in urine collected for 3 days from 49 male and 49 female volunteers (age, 18-37 years) reporting a wide range of habitual V&F intakes. Dietary intakes were assessed using 5-day diet records and a food frequency questionnaire. V&F groupings (total V&F, total V, total F, soyfoods, and V&F grouped by botanical families) were used to assess the relationship between V&F intake and urinary isoflavonoid and lignan excretion. Pearson correlations were performed. Intake of soyfoods was correlated significantly with urinary genistein (r = 0.40; P = 0.0001), O-desmethylangolensin (r = 0.37; P = 0.0002), daidzein (r = 034; P = 0.0007), and the sum of isoflavonoids (r = 0.39; P = 0.0001). There was no association between equol excretion and soy intake or between the isoflavonoids and any other V&F groupings. In addition, isoflavonoid excretion was correlated positively with intake of high-fat and processed meats, particularly among men who did not consume soy. This suggests that, even in the United States, on a Western diet, soyfoods are the primary contributors to isoflavone intake; however, additional "hidden sources" of soy may also contribute to exposure. In contrast, a variety of fiber-containing foods contributed to lignan excretion; the sum of the urinary lignans, enterodiol, enterolactone, and matairesinol, was associated with intake of total F (r = 0.27; P = 0.008), total V&F (r = 0.25; P = 0.01), soyfoods (r = 0.28; P = 0.006), and dietary fiber (r = 0.36; P = 0.0003). Overall, urinary phytoestrogens (isoflavonoids + lignans) were significantly higher in "high" compared with "low" V&F consumers. Compared with the "low" V&F group, the "high" group consumed diets that were, on average, higher in fiber and carbohydrate and soyfoods and lower in fat; thus, the urinary phytoestrogens may also be a useful marker of healthier dietary patterns.     

The influence of flaxseed and lignans on colon carcinogenesis and {beta}-glucuronidase activity

Flaxseed, the richest source of mammalian lignan precursors,such as secoisolariciresinol diglycoside (SD), has been shownover the short term to decrease some early markers of coloncancer risk. This study determined whether over the long termflaxseed still experts a colon cancer protective effect, whetherits effect may, in part, be due to its high content of SD andwhether any change in ß-glucuronidase activity playsa role in the protective effect. Six groups of male Sprague-Dawleyrats were fed for 100 days either a basal high fat (20%) diet(BD), BD supplemented with 2.5 or 5% flaxseed or 2.5 or 5% defattedfaxseed (equivalent to the respective flaxseed diets) or BDwith a daily gavageof 1.5 mg SD. All rats were injected witha single dose of azoxymethane (15 mg/kg body wt) 1 week priorto commencing the dietary treatments. Urinary lignan excretion,which is an indicator of mammalian lignan production, was significantlyincreased in the flaxseed and defatted flaxseed groups. Thetotal activity of cecal ß-glucuronidase was significantlyincreased in a dose-dependent manner by the flaxseed and defattedflaxseed diet groups. Compared with the control the number ofaberrant crypts per focus was significantly reduced in the distalcolon of the treated rats. Four microadenomas and two polypswere observed in the control group, but not in the treated groups.The total activity of ß-glucuronidase was positivelycorrelated with total urinary lignan excretion and negativelywith the total number of aberrant crypts and the total numberof aberrant crypt foci in the distal colon. There were no significantdifferences between the flaxseed and the corresponding defattedflaxseed groups. It is concluded that flaxseed has a colon cancerprotective effect, that it is due, in part, to SD and that theprotective effect of flaxseed is associated with increased ß-glucuronidaseactivity.     

The effect of flaxseed supplementation on early risk markers for mammary carcinogenesis.

Since lignans have been suggested to have some cancer-protective effects, flaxseed, the most abundant source of lignan precursors, was tested for its effect on early markers of risk for mammary carcinogenesis. Supplementation of a high-fat diet with flaxseed flour (FF) or defatted flaxseed meal (FM) (5% or 10%) reduced the epithelial cell proliferation by 38.8-55.4% and nuclear aberrations by 58.8-65.9% in female rat mammary gland, with optimum effects seen with the 5% FF. These protective effects were accompanied by increases in urinary lignan excretion indicating that they may be related to the ability of flaxseed to provide lignan precursors.     

Inhibition of chemically induced mammary and colon tumor promotion by caloric restriction in rats fed increased dietary fat

Tumor promotion associated with increased dietary fat may be inhibited by reduction in total caloric intake. This hypothesis was tested in rats given either 7,12-dimethylbenz(a)anthracene to induce mammary tumors or 1,2-dimethylhydrazine to induce colon tumors. One week after dosage with either carcinogen, the rats were fed semipurified diets that provided 4% fat with ad libitum calories or 13.1% fat with a reduction of calories by 40% from ad libitum intake. Rats treated with 7,12-dimethylbenz(a)anthracene and subjected to caloric restriction weighed 40% less than those fed ad libitum; rats treated with 1,2-dimethylhydrazine were heavier at the onset of caloric restriction and lost weight and weighed approximately 40% less than animals fed ad libitum. At 20 weeks after 7,12-dimethylbenz(a)anthracene administration, rats fed ad libitum had 80% tumor incidence while in those fed restricted calories, 20% had tumors (P less than 0.001). All other measures of mammary tumor growth were significantly reduced in rats given restricted calories. Six months after 1,2-dimethylhydrazine administration, colon tumor incidence was 100% in rats fed ad libitum and 53% in those fed the calorie-restricted diet (P less than 0.001). This reduction of colonic carcinogenesis was seen despite a significant increase in mucosal labeling index following [3H]thymidine autoradiography. This paradoxical finding may be due to the increased fat content of the calorie-restricted diet. These data demonstrate that the tumor-promoting effects of dietary fat can be more than offset by a reduction in total caloric intake and that the promoting effect of fat may be due, at least in part, to its greater caloric density.     

Changes in 2-hydroxyestrone and 16alpha-hydroxyestrone metabolism with flaxseed consumption: modification by COMT and CYP1B1 genotype.

Consumption of the phytoestrogen lignans, structurally similar to estrogen, has been associated with alterations in gene expression and estrogen metabolism. Furthermore, lignan consumption, subsequent changes in metabolizing enzyme expression, and genetic variability in these enzymes may alter estrogen metabolism and modify disease risk. Therefore, we investigated the effect of flaxseed on hydroxyestrone metabolite excretion by catechol-O-methyltransferase (COMT) and cytochrome P450 1B1 (CYP1B1) genotype. We conducted an intervention among 132 healthy, postmenopausal women, ages 46 to 75 years. Participants consumed 10 g ground flaxseed daily for 7 consecutive days. Blood and urine samples were collected at baseline and after the 7-day intervention. COMT Val(158)Met and CYP1B1 Leu(432)Val genotypes were determined using PCR-RFLP methods. Urinary 2-hydroxyestrone (2OHE1) and 16alpha-hydroxyestrone (16OHE1) were quantified by ELISA assay. The effect of genotype on intervention-related changes in estrogen metabolites was assessed with the Kruskal-Wallis test. Compared with baseline levels, postintervention levels of urinary 2OHE1 (ng/mg creatinine; mean +/- SD, 16.1 +/- 10.6 versus 9.3 +/- 6.9, postintervention and baseline, respectively; P < 0.01) and 2OHE1/16OHE1 ratios (mean +/- SD, 2.73 +/- 1.47 versus 1.54 +/- 0.75, postintervention and baseline, respectively; P < 0.01) were significantly higher. The change in 2OHE1/16OHE1 increased with increasing numbers of variant alleles for COMT (mean change: Val/Val, 0.90; Val/Met, 1.15; and Met/Met, 1.50; P = 0.17, Kruskal-Wallis) and especially CYP1B1 (mean change: Leu/Leu, 0.89; Leu/Val, 1.32; and Val/Val, 1.51; P = 0.04, Kruskal-Wallis). Our findings suggest that variation in hormone-related genes may modify the effect of dietary lignan exposures on estrogen metabolism.     

Delta-9-tetrahydrocannabinol may palliate altered chemosensory perception in cancer patients: results of a randomized,double-blind,placebo-controlled pilot trial

BackgroundA pilot study (NCT00316563) to determine if delta-9-tetrahydrocannabinol (THC) can improve taste and smell (chemosensory) perception as well as appetite, caloric intake, and quality of life (QOL) for cancer patients with chemosensory alterations.Patients and methodsAdult advanced cancer patients, with poor appetite and chemosensory alterations, were recruited from two sites and randomized in a double-blinded manner to receive either THC (2.5 mg, Marinol®; Solvay Pharma Inc., n = 24) or placebo oral capsules (n = 22) twice daily for 18 days. Twenty-one patients completed the trial. At baseline and posttreatment, patients completed a panel of patient-reported outcomes: Taste and Smell Survey, 3-day food record, appetite and macronutrient preference assessments, QOL questionnaire, and an interview.ResultsTHC and placebo groups were comparable at baseline. Compared with placebo, THC-treated patients reported improved (P = 0.026) and enhanced (P < 0.001) chemosensory perception and food ‘tasted better’ (P = 0.04). Premeal appetite (P = 0.05) and proportion of calories consumed as protein increased compared with placebo (P = 0.008). THC-treated patients reported increased quality of sleep (P = 0.025) and relaxation (P = 0.045). QOL scores and total caloric intake were improved in both THC and placebo groups.ConclusionsTHC may be useful in the palliation of chemosensory alterations and to improve food enjoyment for cancer patients.     

Plasma insulin-like growth factor I levels in rats are reduced by dietary supplementation of flaxseed or its lignan secoisolariciresinol diglycoside

Flaxseed and its lignan secoisolariciresinol diglycoside (SDG) inhibit mammary tumor development in rats. Increased plasma insulin-like growth factor I (IGF-I) concentrations are associated with increased breast cancer risk. Therefore, the effect of flaxseed (5%) or SDG (1.5 mg/day) supplementation on plasma IGF-I levels was examined in rats treated with or without N-methyl-N-nitrosourea (MNU). In MNU-free rats, flaxseed and SDG reduced plasma IGF-I levels, which were inversely related to urinary lignan excretion. Only flaxseed significantly reduced plasma IGF-I concentrations in MNU-treated rats. The anticancer effect of flaxseed and SDG may be related, in part, to reductions in plasma IGF-I.     

Phytoestrogen intake from foods,during adolescence and adulthood,and risk of breast cancer by estrogen and progesterone receptor tumor subgroup among Ontario women

Phytoestrogen intake may reduce breast cancer risk and limited evidence suggests this association may hold for hormone receptor‐positive tumors only. The study aims were to assess whether the association between phytoestrogen intake during adolescence and adulthood and breast cancer risk varies by estrogen and progesterone receptor (ERPR) tumor subgroup. Cases were identified from the Ontario Cancer Registry (2002–2003), and ERPR status was ascertained from pathology reports for 81% of cases (n = 2,438). Controls were identified through random digit dialing of Ontario households (n = 3,370). Published phytoestrogen food values were applied to food frequency questionnaire responses to assess isoflavone, lignan and total phytoestrogen intake, during adolescence and adulthood. Polytomous multivariate logistic regression was used to estimate adjusted odds ratios (ORs) for association between phytoestrogen intake and breast cancer risk by hormone receptor ERPR tumor subgroups. Among premenopausal women, few associations were observed for adolescent or adult phytoestrogen intake across all tumor subgroups. Among postmenopausal women, adolescent phytoestrogen intake (isoflavone, lignan and total) was associated with reduced risk across all hormone receptor subgroups; however, statistical significance was most consistent within the ER+PR+ subgroup. For example, ER+PR+ postmenopausal breast cancer risk was associated with adolescent phytoestrogen intake (highest vs. lowest: OR = 0.79; 95% confidence interval: 0.65–0.96). Among all women and postmenopausal women, ORs for high adult lignan intake were all below 1.0 within each tumor subgroup, suggesting reduced breast cancer risk, although none reached statistical significance. In conclusion, adolescent phytoestrogen intake was associated with reduced postmenopausal breast cancer, particularly for ER+PR+ tumor subgroup.     

老年宫颈癌p53和c-erbB2表达及其临床意义

背景与目的：老年宫颈癌分子生物学方面的研究尚不多见,因此我们将探讨抑癌基因p53和癌基因c-erbB2表达在其发生发展过程中的意义。方法：应用免疫组化LSAB法检测79例老年宫颈癌及23例正常老年宫颈上皮石蜡切片的p53和c-erbB2蛋白阳性率。结果：老年宫颈浸润癌和正常宫颈上皮p53蛋白阳性率分别为18．98％和0（P＜0．01）,而c-erbB2表达率为43．04％和34．78％（P＝0．63）。组织学分级I、Ⅱ、Ⅲ级中p53蛋白阳性率分别为50．00％、11．76％和17．14％（P＝0．01）,c-erbB2表达率分别为80．00％、38．24％及37．14％（P＜0．01）。临床分期I、Ⅱ、Ⅲ／Ⅳ期中p53表达分别为11．11％、15．38％、25．18％（P＝0．26）,c-erbB2蛋白阳性率为33．33％、38．46％和51．61％（P＜0．01）。淋巴结无转移组及转移组p53蛋白阳性率为6．67％、41．67％（P＝0．01）,c-erbB2表达率为26．67％、58．33％（P＝0．08）。结论：p53蛋白在老年宫颈癌发生发展中可能起作用,它可能是预测淋巴结转移的重要指标。c-erbB2基因过度表达可能是老年宫颈癌发生的早期事件。     

Effect of fish oil on appetite and other symptoms in patients with advanced cancer and anorexia/cachexia: a double-blind, placebo-controlled study.

PURPOSE: To determine whether high doses of fish oil, administered over 2 weeks, improve symptoms in patients with advanced cancer and decreased weight and appetite. PATIENTS AND METHODS: Sixty patients were randomly assigned to fish oil capsules or placebo. Appetite, tiredness, nausea, well-being, caloric intake, nutritional status, and function were prospectively assessed at days 1 and 14. RESULTS: The baseline weight loss was 16 +/- 11 and 16 +/- 8 kg in the fish oil (n = 30) and placebo (n = 30) group respectively, whereas the baseline appetite (0 mm = best and 10 mm = worst) was 58 +/- 24 mm and 67 +/- 19 mm, respectively (P = not significant). The mean daily dose was 10 +/- 4 (fish oil group) and 9 +/- 3 (placebo group) capsules, which provided 1.8 g of eicosapentaenoic acid and 1.2 g of docosahexaenoic acid in the fish oil group. No significant differences in symptomatic or nutritional parameters were found (P <.05), and there was no correlation between changes in different variables between days 1 and 14 and the fish oil doses. Finally, the majority of the patients were not able to swallow more than 10 fish oil capsules per day, mainly because of burping and aftertaste. CONCLUSION: Fish oil did not significantly influence appetite, tiredness, nausea, well-being, caloric intake, nutritional status, or function after 2 weeks compared with placebo in patients with advanced cancer and loss of both weight and appetite.     

Dietary lignan and proanthocyanidin consumption and colorectal adenoma recurrence in the Polyp Prevention Trial

Lignans and proanthocyanidins are plant polyphenols that have shown protective properties against colorectal neoplasms in some human studies. Using logistic regression, we estimated odds ratios (ORs) and 95% confidence intervals (CIs) to prospectively evaluate the association between lignan and proanthocyanidin intake, estimated from databases linked to a food frequency questionnaire, and adenoma recurrence in 1,859 participants of the Polyp Prevention Trial. Overall, individual or total lignans or proanthocyanidins were not associated with colorectal adenoma recurrence. However, in sex-specific analyses, total lignan intake was positively associated with any adenoma recurrence in women (highest vs. lowest lignan intake quartile OR = 2.07, 95% CI: 1.22-3.52, p trend = 0.004) but not in men (p interaction = 0.04). To conclude, dietary lignan and proanthocyanidin consumption were not generally related to colorectal adenoma recurrence; however, high lignan intake may increase the risk of adenoma recurrence in women.     

Overnight urinary isoflavone excretion in a population of women living in the United States, and its relationship to isoflavone intake.

Dietary isoflavones are biologically active in humans, but few observational data exist on the relationship between isoflavone intake and excretion in Western populations. We examined associations between self-reported soy intakes and overnight urinary isoflavone excretion in a population-based sample of western Washington State women, and we investigated the usefulness of one versus two overnight urine samples, collected 48 h apart, as a biomarker of intake. Isoflavones (genistein, daidzein, O-desmethylangolensin, and equol) were measured in two overnight urine collections from 363 women recruited from a health maintenance organization. Soy food intakes were assessed using two 1-day diet records completed on each day prior to the urine collections and a food frequency questionnaire (FFQ) that had been completed by 312 of the women with regard to their dietary habits 3.5 years (range, 2-5 years) before the urine collections. Twenty-one percent of the women consumed soy on either day of the diet recall, and 13% and 34% of the women consumed soy at least once a week or at least once a month, respectively, according to the FFQ. Women who consumed soy at either of the two diet recalls or at the FFQ (at least once a week or at least once a month) had a significantly higher urinary excretion of isoflavones than women who did not consume soy (P < 0.01). Among women who consumed soy at either of the two diet recalls or at the FFQ (soy consumed at least once a month), isoflavone intake and excretion correlated significantly (P < 0.01). Excretion of the individual isoflavones correlated significantly between the two urine samples collected 48 h apart (genistein, r = 0.41 and P < 0.001; daidzein, r = 0.30 and P < 0.001; O-desmethylangolensin, r = 0.46 and P < 0.001; equol, r = 0.60 and P < 0.001). Differences between soy consumers and nonconsumers and associations between intakes and excretion remained significant whether one or both urine collections were considered. Measuring isoflavone excretion in one overnight urine collection serves as a biomarker of recent or past isoflavone intake, even in populations whose intake of soy foods is relatively low.     

Comparison of the short-term biological effects of 7alpha-[9-(4,4,5,5,5-pentafluoropentylsulfinyl)-nonyl]estra-1,3,5, (10)-triene-3,17beta-diol (Faslodex) versus tamoxifen in postmenopausal women with primary breast cancer

7Alpha-[9-(4,4,5,5,5-pentafluoropentylsulfinyl)-nonyl]estra-1,3,5, (10)-triene-3,17beta-diol (ICI 182,780; Faslodex) is a novel steroidal antiestrogen. This partially blind, randomized, multicenter study compared the effects of single doses of long-acting ICI 182,780 with tamoxifen or placebo on estrogen receptor (ERalpha) and progesterone receptor (PgR) content, Ki67 proliferation-associated antigen labeling index (Ki67LI), and the apoptotic index in the primary breast tumors of postmenopausal women. Previously untreated patients (stages T(1)-T(3); ER-positive or -unknown) were randomized and received a single i.m. dose of ICI 182,780 50 mg (n = 39), ICI 182,780 125 mg (n = 38), or ICI 182,780 250 mg (n = 44) or oral tamoxifen 20 mg daily (n = 36) or matching tamoxifen placebo (n = 43) for 14-21 days before tumor resection surgery with curative intent. The ER and PgR H-scores, together with the Ki67LI were determined immunohistochemically in the matched pretreatment biopsy and the posttreatment surgical specimens. The apoptotic index was determined by terminal deoxynucleotidyltransferase-mediated dUTP-biotin nick end labeling on the same samples. The effects of treatment on each of these parameters were compared using analysis of covariance. ICI 182,780 produced dose-dependent reductions in ER and PgR H-scores and in the Ki67LI. The reductions in ER expression were statistically significant at all doses of ICI 182,780 compared with placebo (ICI 182,780 50 mg, P = 0.026; 125 mg, P = 0.006; 250 mg, P = 0.0001), and for ICI 182,780 250 mg compared with tamoxifen (P = 0.024). For PgR H-score, there were statistically significant reductions after treatment with ICI 182,780 125 mg (P = 0.003) and 250 mg (P = 0.0002) compared with placebo. In contrast, tamoxifen produced a significant increase in the PgR H-score relative to placebo, and consequently, all doses of ICI 182,780 produced PgR values that were significantly lower than those in the tamoxifen-treated group. All doses of ICI 182,780 significantly reduced Ki67LI values compared with placebo (ICI 182,780 50 mg, P = 0.046; 125 mg, P = 0.001; 250 mg, P = 0.0002), but there were no significant differences between any doses of ICI 182,780 and tamoxifen. ICI 182,780 did not alter the apoptotic index when compared with either placebo or tamoxifen. Short-term exposure to ICI 182,780 reduces the ERalpha in breast tumor cells in a dose-dependent manner by down-regulating ER protein concentration. The reductions in tumor PgR content by ICI 182,780 demonstrate that ICI 182,780, unlike tamoxifen, is devoid of estrogen-agonist activity. Reductions in tumor cell proliferative activity (as indicated by Ki67LI) show that ICI 182,780 is likely to have antitumor activity in the clinical setting.     

Total calories, body weight, and tumor incidence in mice

The relation between total caloric intake, body weight, and tumorigenesis, as well as the independence of these effects from those of dietary fat, were evaluated using data from 82 published experiments involving several tumor sites in mice. Comparing experimental (calorie restricted) to control (ad libitum) groups showed that the former consumed 29% fewer calories (experimental groups consumed fewer calories than control groups in all but a few isocaloric experiments), 50% less total fat, 11% less protein, and weighed 25% less than control animals. Adult body weight was highly correlated to caloric intake in both males (r = 0.85) and females (r = 0.74), although this correlation decreased with increasing caloric intake. Cumulative tumor incidence was, on average, 42% lower in the restricted groups. Multivariate regression analyses revealed that, regardless of the level of dietary fat, tumor incidence increased with increasing caloric intake and body weight over a wide range of intakes, including moderate caloric restriction (i.e., 7-20%). These data indicate that total caloric intake is an important determinant of tumorigenesis in mice, and that body weight may be a more sensitive indicator for this effect than is caloric intake alone.     

Insulin, physical activity, and caloric intake in postmenopausal women: breast cancer implications.

PURPOSE: Increased physical activity and programs to reduce body mass index (BMI) with both increased physical activity and decreased caloric intake have been proposed to reduce insulin as a potential mediator of breast cancer and other chronic diseases. However, there are few data on the relative contribution of physical activity, caloric intake, and BMI to fasting insulin levels. MATERIALS AND METHODS: An ethnically diverse subsample of 2,996 mostly healthy postmenopausal women with no prior cancer history was randomly identified from the 161,809 participants in the Women's Health Initiative clinical trials and observational study. Information was collected on diet, recreational physical activity, and anthropometrics including BMI. Fasting insulin levels were determined. Using a cross-sectional design, insulin levels were then compared across quintiles of caloric intake and physical activity in linear regression model analyses controlled for BMI and other factors. RESULTS: Lower BMI (P < .0001), higher levels of physical activity (P < .0001), and lower caloric intake (P < .02) were all independently associated with significantly lower mean fasting insulin levels throughout the range of observed values. Insulin levels of 8.74 microU/mL +/- 4.16 SD were seen in the highest physical activity and lowest caloric intake quintile compared with insulin levels of 15.08 microU/mL +/- 16.32 SD in the lowest physical activity and highest caloric intake quintile (P < .0001). CONCLUSION: These findings suggest that reduction in BMI achieved by increasing physical activity, reducing caloric intake, or both, should lower insulin levels, providing support for clinical trials evaluating insulin level change and breast cancer risk.     

非小细胞肺癌组织p53和c-erbB2及MRP蛋白的表达

目的探讨癌组织p53、c-erbB2、MRP蛋白表达与非小细胞肺癌（NSCLC）临床病理特征的关系及其预后评估意义。方法应用免疫组织化学方法检测NSCLC患者的肺组织切除标本p53、c-erbB2、MRP蛋白表达,并与其临床病理参数进行比较分析。结果NSCLC组织p53、c-erbB2、MRP蛋白表达阳性率分别为53.9%（82/152）、44.1%（67/152）及43.4%（66/152）。p53表达与性别、细胞分化程度、临床分期、淋巴结转移有显著关系（P〈0.05）,而c-erbB2与各因素间无统计学差异,肺腺癌MRP蛋白表达阳性率（67.6%）明显高于肺鳞癌（33.0%）,有统计学差异（P〈0.05）。癌组织p53、c-erbB2、MRP 3种蛋白表达均阳性者的1、2、3年生存率明显低于均阴性者（分别P=0.02、0.01和0.00）,p53、c-erbB2、MRP蛋白表达阳性者单纯手术后生存率也明显低于阴性者（P〈0.05）;p53、c-erbB2、MRP 3种蛋白表达均阴性者预后最好,1-2种阳性者次之,3种均阳性者预后最差（P〈0.05）。术后辅助化疗组MRP、c-erbB2蛋白表达阳性者的生存率低于阴性者（P〈0.01）,但p53蛋白表达阳性与阴性患者的生存率无统计学差异（P=0.82）;MRP与c-erbB2表达双阴性者生存率显著高于双阳性者,MRP或c-erbB2单一阳性的生存率介于前两者之间（P=0.01）。多因素Cox分析显示细胞分化程度、c-erbB2是影响NSCLC患者疗效和预后的独立预测因子。结论肿瘤组织p53、c-erbB2、MRP 3种蛋白同时高表达的NSCLC病例预后较差。术后检测p53、c-erbB2、MRP表达对评估可手术NSCLC患者疗效和预后有一定意义。     

癌蛋白c—erbB2在乳腺肿瘤患者中过度表达的免疫组化研究

目的检测ｃ－ｅｒｂＢ２蛋白过度表达与乳腺肿瘤患者预后的关系,探讨其作为预后指标的可行性。方法共８５例原发乳腺肿瘤的石蜡切片标本,采用免疫组化方法。结果７例良性病变无１例过度表达;７８例乳腺癌２３例过度表达,表达率为２９．４％;８０％的无淋巴结转移病例未检测到ｃ－ｅｒｂＢ２的过度表达。ｃ－ｅｒｂＢ２蛋白的过度表达在临床Ⅲ期病例中占７１％。ｃ－ｅｒｂＢ２与雌激素受体（ＥＲ）表达呈相反关系的占６７％。该蛋白过度表达与腋淋巴结转移情况未发现相关性（Ｐ＞０．０５）,与临床分期呈显著的正相关（Ｐ＜０．００５）,与ＥＲ呈显著的负相关（Ｐ＜０．００５）。结论ｃ－ｅｒｂＢ２过度表达者预后不良。它可以作为判断乳腺肿瘤患者预后的有效指标,用于临床,辅助判断患者预后,可能具有重要意义。     

The effect of flaxseed and wheat bran consumption on urinary estrogen metabolites in premenopausal women.

Estrogen is metabolized along two competing pathways to form the 2-hydroxylated and the 16alpha-hydroxylated metabolites. Based on proposed differences in biological activities, the ratio of these metabolites, 2-hydroxyestrogen:16alpha-hydroxyestrone (2:16alpha-OHE1), has been used as a biomarker for breast cancer risk. Women with an elevated 2:16alpha-OHE1 ratio are hypothesized to be at a decreased risk of breast cancer. Flaxseed, the most significant source of plant lignans, and wheat bran, an excellent source of dietary fiber, have both been shown to have chemoprotective benefits. Some of these benefits may be attributable to their influence on endogenous sex hormone production and metabolism. We examined the effect of flaxseed consumption alone and in combination with wheat bran on urinary estrogen metabolites in premenopausal women. Sixteen premenopausal women were studied for four feeding treatments lasting two menstrual cycles each in a randomized cross-over design. During the four feeding treatments, subjects consumed their usual diets supplemented with baked goods containing no flaxseed or wheat bran, 10 g of flaxseed, 28 g of wheat bran, or 10 g of flaxseed plus 28 g of wheat bran/day. Urinary excretion of 2-hydroxyestrogen and 16alpha-hydroxyestrone, as well as their ratio, 2:16alpha-OHE1, were measured by enzyme immunoassay. Flaxseed supplementation significantly increased the urinary 2:16alpha-OHE1 ratio (P = 0.034), but wheat bran had no effect. These results suggest that flaxseed may be chemoprotective in premenopausal women.     

肾癌细胞Ki-67免疫组化染色指数与预后的关系

 为探索肾癌预后较好的估价指标，41例肾癌根治标本Ki—67免疫组化染色。复发组的Ki—67染色指数显著高于未复发组（P相似文献