Showing 12 results for Density
Javadi P, Haeri H,
Volume 59, Issue 4 (8-2001)
Abstract
Tumor angiogenesis shown by Microvessel Count (MVC) or Microvessel Density (MVD), is assessed by several studies as prognostic factor in some types of tumors, and also in colorectal carcinoma. This article is payed to correlation between clincopathologic factors and tumor angiogenesis. In this study, immunohistochemical techniques are used for vascular evaluation in specimens from twenty-nine colorectal carcinoma, and stained for Factor VIII-Related Antigen (F8RA) by using monoclonal antibody. Uni and multivariate analysis disclosed that total MVC was higher in tumor [76.3±33 (×100=2.5 mm²/field) and 29.8±11 (×200=0.785 mm²/field)] than in normal tissue [37.7±15.8 (×100) and 17.6±7.8 (×200)], (P=0.022, P=0.000009). Microvessel quantification was significantly higher in stage D (115±36.6, ×100 and 26.7±6.4, ×200, P=0.002 and P=0.04). In this study MVD has correlation with vascular invasion (P=0.024, ×100 and P=0.007, ×200), the mean tumor vessel count although was increased with clinicophatologic findings such as age<60 years, male, right colon involvement, infiltrating type, mucinous carcinoma, transmural penetration, grade III, lymphatic and perineural invasion, but was not statistically significant. Lymph node and hematogenous metastasis and size of tumor also, was not important. As a conclusion, MVD was increased in tumor and has shown correlation with metastasis, and vascular invasion. Resulting angiogenesis increase risk of metastasis.
Akbarian M, Davachi F, Salim Zadeh A, Shahram F, Gharib Doost F, Tajy A H, Pajoohi M, Jamshidi Ar ,
Volume 60, Issue 4 (7-2002)
Abstract
Introduction: The bone mass density (BMD) may vary in different countries due to different genetic and environmental factors. This study was performed to determine the BMD of the normal population in Iran.
Methods and Materials: Subjects were selected randomly from different works and social classes in Tehran (from the lowest to the highest). For each decade and sexes, 20 normal subjects were selected (140 men and 140 women). BMD was measured with a Hologic 1000 plus machine by dual energy x-ray absorptiometry (DEXA) method for the lumber spine (L1, L2, L3, L4, L1-L4) and the femoral neck (neck, trochanter, intertrochanter, ward, total). Data were treated by polynomial approximation (3 rd degree). The obtained curves were compared with the standard Hologic curves for Caucasians.
Results: In female the peak bone mass (PBM) was 1.019 g/cm² for the lumbar spine and 0.832 for the femoral neck. In male the peak bone mass (PBM) was 0.987 g/cm² for the lumbar spine and 0.907 for the femoral neck. The BMD of both lumbar spine and femoral neck were lower than the Hologic standards. For the lumbar spine the mean difference was 6.5 percent (2 to 21 percent, CI=1) for women and 13.8 percent (2 to 36 percent, CI=1.45) for men. In femoral neck the mean difference was 5.4 percent (2 to 16 percent, CI=0.96) for women and 4.6 percent (1 to 14 percent, CI=0.96) for men.
Conclusion: The BMD of the lumbar spine and the femoral neck was lower in Iranian compared to the Hologic standards for Caucasians. This was seen in all age groups and in both sexes. It was less pronounced for the PBM in spine was lower in men than woman. The lower BMD of the spine in men was also seen in a cohort of patients with different diseases (inflammatory and non-inflammatory).
Z Sanaat , M Tavangar , A Shriftabrizi , K Alimoghadam , A Ghavamzadeh , M Jahani ,
Volume 62, Issue 4 (7-2004)
Abstract
Background: The important of angiogenesis for the progressive growth and viability of solid tumors is well established. Only few data are available for hematologic neoplasms.
Materials and Methods: To investigate the role of angiogenesis in the acute myloid leukemia (AML) bone marrow biopsies from 30 adults with newly diagnosed, untreated AML(day 0) were evaluated. Further studies were done after completion on remission induction of treatment (day 35 of 7×3 regimen n=13, complete remission in AML (m3) treat with arsenic trioxide n=17). Micro-vessels were scored in at least 3 areas of highest micro-vessel density in representative section of each bone marrow specimen using immunohistochemistry for Von Willbrand factor.
Results: Median micro-vascular density (MVD) were in AMLM3 patients before treatment, %6.81±3.58 and after treatetment %3.48±3.06 (p<0.0001). In other AML patients MVD were befor treatment %3.38 and after treatment %3.6.
Conclusion: In conclusion, there is evidence of increased micro-vessel density in the bone marrow of patients with AML, which supports the hypothesis of an important role of angiogenesis in AML. MVD was reduced with chemotherapy and arsenic. Furthermore , these finding suggest that antiangiogenesis therapy might constitute a novel strategy for the treatment of AML.
Khezerdost S, Bahadori F, Shafaat M, Yahyazadeh H, Yahyazadeh N, Amini E,
Volume 66, Issue 10 (1-2009)
Abstract
Background: Tumor cells need food and oxygen supply for growth and division. Therefore one of the most promising areas of cancer therapy focuses on using agents that inhibit tumor angiogenesis. Inhibition of angiogenesis prevents cell growth, division and metastasis. Previous studies showed that plasminogen related Protein-B has an anti-tumor activity in mice. This protein has a high level of homology with preactivation Peptide (PAP) of human plasminogen. According to this high homology, antiangiogeneic activity of PAP was investigated in an in vitro angiogenesis model.
Methods: PAP encoding region of human plasminogen gene was isolated by Polymerase Chain Reaction and cloned in pGEX-2T vector. This plasmid was expressed in Escherichia coli as a fusion protein (GST-PAP). GST-PAP was expressed as inclusion body and purified by affinity chromatography on GSH-sepharose resin after refolding. antiangiogenic effects of purified protein were surveyed with Matrigel assay.
Results: The GST-PAP was expressed and purified and its accuracy was confirmed by SDS-PAGE analysis and immunoblotting. Microscopic studies showed that GST-PAP inhibited angiogenesis in Matrigel system which is shown by shrinking the length of capillary like structures and a decrease in the number of tubule. While applying concentarations of 25μg/ml of GST-PAP and concentrations above that, antiangiogenic activity of GST-PAP was significant comparing to the controls.
Conclusion: Finding shows that GST-PAP can inhibit network formation in Matrigel system. This findings support the theory that PAP is a potent angiogenesis inhibitor.
Ahrari Khafi Ms, Soroori S, Nakhjavani M, Mortazavi P, Vajhi Ar, Bahonar Ar,
Volume 69, Issue 1 (4-2011)
Abstract
Background: The effects of growth hormone (GH) on bone density in healthy adults is controversial. This study was performed to evaluate the effects of GH administration on bone density under controlled conditions in healthy adult rabbits.
Methods: Twenty healthy adult New Zealand white rabbits of both sexes were included in the study. The rabbits were divided into two groups. The experiment group received human GH and the controls placebo for three months. The density of femur and humerus were measured at proximal epiphysis, mid shaft and distal epiphysis by radiography, aluminum step-wedge and appropriate software. Measurements were performed in five stages, once before and four times after the administration of GH or placebo, with 3-week intervals.
Results: The mean concentration of serum insulin-like growth factor I (IGF-I) increased significantly after GH administration (P<0.05) in the experiment group. Bone density generally increased in all regions except the distal epiphysis of femur in the test group, but significant difference were only seen in the midshaft of femur in comparison to the controls (P<0.05). In the second stage, bone density decreased slightly in all regions except distal epiphysis of femur, but it increased in the next stages.
Conclusion: GH can increase bone density (mostly cortical bone) in adult rabbits. According to the similarities seen between growth hormone effects in rabbit and humans, this study suggests rabbits as a model for studying GH effects on bone density in acromegaly, growth hormone deficiency and even in healthy adult humans.
Amanpour S, Muhammadnejad S, Muhammadnejad A, Mazaheri Z, Kazem-Haghighi M, Oghabian M, Khoshnevisan A,
Volume 69, Issue 3 (6-2011)
Abstract
Background: Despite advances in cancer diagnosis and treatment, survival rate of
patients suffering from glioblastoma multiform (GBM) has not been significantly improved. Therefore, novel therapeutic adjuncts to routine therapies have been suggested over time. Inhibition of angiogenesis by antiangiogenic drugs is one of the new approaches to inhibit the growth of malignant cells. Microvessel density (MVD) assay is a technique performed by counting immunohistochemically-stained blood vessels. Nowadays, athymic nude mice are widely used for the establishment of xenograft tumor models in cancer research. The aim of this study was to evaluate the MVD of autochthonous xenograft models of GBM isolated from Iranian patients for use in pharmaceutical research on antiangiogenic drugs.Methods: Fresh tumor samples of GBM were obtained from three patients in Cancer Institute of Tehran University of Medical Sciences in Fall of 2010 and Winter of 2011. After preliminary processing, minced tumor samples were implanted heterotopically on flanks of athymic nude mice. Two months later, the animals were sacrificed and the xenograft tumor samples were sent to the pathology laboratory. After establishing the proof of the xenograft tumor type, MVD-CD34, an endothelial cell marker, was assessed by counting hot spot areas in 22 samples.Results: The mean number of microvessels in these xenograft tumor models was 30±2.1.
Conclusion: These autochthonous xenograft models of GBM can be used in preclinical settings for research on antiangiogenic drugs regarding a pharmacogenomics-based treatment regimen for the Iranian population. Moreover, such models can be used in future studies for determining the sensitivity or resistance to antiangiogenic drugs in individualized cancer therapy.
Saedi Daryoosh, Molavi Mohamad,
Volume 70, Issue 3 (6-2012)
Abstract
Background: Since non-contrast spiral CT (NCCT) is an imaging method of choice performed before extracorporeal shockwave lithotripsy (ESWL), we aimed to find the association between renal stone characteristics including stone density, location, volume, and skin-to-stone distance (SSD) on NCCT and ESWL success for a more efficient selection of patients for the procedure.
Methods: We retrospectively studied 100 patients having undergone initial ESWL for a solitary renal calculus of 0.5-2.5 cm. Stone size, location, density, and SSD were determined on pretreatment NNCT. The outcome was categorized as stone free, complete fragmentation (<5 mm), incomplete fragmentation (>5 mm) and unchanged, based on KUB radiography 2 weeks after ESWL.
Results: Of 100 patients, 32 were female and 68 were male with a mean age of 46.7 years. ESWL was successful in 55 and failure occurred in 45 patients. Sex (P=0.301), age (P=0.895) and SSD (P=4.06) were not associated with treatment success. Mean stone volume in ESWL success and failure groups, respectively were 531.4 and 930.5 mm3 and stone volume was statistically associated with treatment success (P=0.01). Mean stone density in ESWL success and failure groups were 545.7 and 962.3 HU, respectively and stone density was also associated with ESWL success (P<0.01). ESWL failure likelihood was 5 times greater in stones with a density >740 HU than smaller stones.
Conclusion: We strongly suggest performing densitometry in bone window for renal stones on pre-ESWL NCCT scanning and using an alternative treatment other than ESWL for stone densities greater than 740 HU.
Aghaei M, Sedighi S, Behnam Pour N, Hezar Khani Sh, Jamshir M, Agh A, Shojaa M,
Volume 70, Issue 7 (10-2012)
Abstract
Background: Low bone mass is a serious health problem mostly seen in postmeno-pausal women with rheumatoid arthritis. The purpose of this study was to determine the prevalence of osteoporosis and some related risk factors in postmenopausal women with rheumatoid arthritis.
Methods: The data for this descriptive analytical study was extracted from the medical records of 98 postmenopausal women with rheumatoid arthritis who had attended the 5th of Azar Teaching Hospital affiliated to Gorgan University of Medical Sciences, in Iran, in 2009.
Results: The mean durations of menopause and rheumatoid arthritis were 9.39 and 5.13 years, respectively. The overall prevalence of osteoporosis was 13.3%. We found a significant correlation between age, disease duration, and duration of menopause with bone mineral density (P<0.05).
Conclusion: Our results indicate a high prevalence of osteoporosis at the lumbar spine of postmenopausal women with rheumatoid arthritis.
Ameri E, Ghandehari H, Shafipour R,
Volume 70, Issue 8 (11-2012)
Abstract
Background: Several studies have suggested higher incidence of osteoporosis in patients with idiopathic scoliosis in comparison with the normal population. The aim of this study was to assess the prevalence of low bone mass among adolescent girls with idiopathic scoliosis.
Methods: In this cross-sectional study performed in shafa Hospital in Tehran, Iran during 2011-2012, we recruited fifty-seven 12- to-20-year old girls with idiopathic scoliosis and compared them with 100 age-matched healthy girls. The patients had no other diseases including neuromuscular disorders, congenital vertebral anomalies or a history of spinal surgery. Bone mineral densities (BMD) of the hip and spine were evaluated and compared in all 157 participants using dual X-ray absorptiometry (DXA). Standard BMD (sBMD) was also calculated at the lumbar spine.
Results: Analysis of the data revealed that hip BMD was significantly (P=0.004) lower in patients with idiopathic scoliosis versus the controls. Moreover, BMD and sBMD of the Spine were also significantly lower in the patients (respectively, P=0.030 and P=0.030). Curve location had no effect on the values of hip BMD, spine BMD or spine sBMD (respectively, P=0.061 and P=0.274 and P=0.208).
Finally, with more severe curves a lower bone mass was detected for sBMD and spine BMD (respectively, P=0.017 and P=0.016), but it was not significant for hip BMD (P=0.069).
Conclusion: Adolescent girls with idiopathic scoliosis had lower bone mass compared with their healthy peers. The lower bone mass was correlated with the severity of the curve but not its location.
Rouhangiz Babakhanianzadeh, Nahid Masoudian , Amirnader Emami Razavi, Gholam Basati ,
Volume 73, Issue 7 (10-2015)
Abstract
Background: Low density lipoprotein (LDL) particles have shown to be heterogeneous structures with distinctive electrical charges. Alteration in the fatty acids content of the LDL particles is known to affect their structural features, electrical charges, and ultimately physiologic properties and, in this way, may play a role in the pathology of coronary artery disease (CAD). On the basis of evidences, in the present study, the relationship of fatty acids content of LDL particles and their electrical charge was assessed in patients with CAD in comparison with control subjects. Methods: In the current case- control study, from subjects who referred to the Mostafa Khomeini Hospital in Ilam during a time period from December 2013 to October 2014, 40 CAD patients and 40 control subjects were selected based on the clinical and angiographic parameters. The fatty acids content and electrical charges of LDL particles were measured by using a gas chromatography system, equipped with a flame ionization detector GC-FID, Acme 6000 M (Young Lin Co., Korea) as well as a Zetasizer (Malvern Instruments Ltd., UK), respectively. Results: In the present study, CAD patients and control subjects were matched for age, sex, and body mass index (BMI). The electrical charge amounts of LDL particles in the patients group was significantly lower than those in the control subjects (P= 0.0001). There was an inverse correlation between the electrical charge amounts of the LDL particles and the saturated fatty acids as well as linoleic acid contents of them in CAD patients group. However, we found a direct correlation between the unsaturated fatty acids (monounsaturated fatty acids and some of the polyunsaturated ones) content of the LDL particles and their electrical charge amounts (P= 0.02). Conclusion: Results of the present study demonstrated that the increased saturated fatty acids as well as the linoleic acid contents of the LDL particles are associated with decreased electrical charge amounts of these particles and this situation may engage in pathogenesis of CAD.
Nosrat Abedpor , Ali Akbar Movassaghpour Akbari , Zohreh Sanaat ,
Volume 77, Issue 7 (10-2019)
Abstract
Background: Acute myeloid leukemia (AML) is blood and bone marrow malignancy. Low-density oxidative lipoprotein (oxLDL) is a pro-inflammatory factor that has free radicals in its structure. OxLDL levels are also rising in diseases such as diabetes, cardiovascular disease, and some cancers. Studies have shown that oxLDL and dyslipidemia are more common in patients with various cancers. This study aimed to evaluate the level of blood lipids and oxLDL in these patients with acute myeloid leukemia.
Methods: In a descriptive study, 36 patients who were diagnosed with acute myeloid leukemia from April 2016 to March 2017 were enrolled. This study was done in Shahid Ghazi Blood Department of Imam Reza Hospital, Tabriz University of Medical Sciences, Iran. Basic information including age, sex, type of disease, cause for referrals of the patients were collected. After obtaining informed consent from patients and 12 hours of fasting, 5 cc blood samples were sent to the Central Laboratory of Shahid Ghazi Hospital to measure the level of blood lipids including cholesterol, triglyceride, low density lipoprotein, high density lipoprotein (HDL), and oxLDL levels. Blood lipid and oxLDL levels were measured by automatic analyzer (Abbott Laboratories, Abbott Park, IL, USA) (ELISA method).
Results: 23 patients (54.8%) were male and 19 (45.2%) were female. The mean age of the patients was 44.06±14.48 years. The lowest age was 25 and the highest was 80 years. In the study, the mean serum cholesterol level was 147.64±42.28 mg/dl, the blood triglyceride was 183.28±79.34 mg/dl, the LDL was 84.89±26.35, and the HDL 29±14.51, the mean oxLDL was 1482.5±6031.85 ng/ml.
Conclusion: The results of this study indicate that dyslipidemia in patients with acute myeloid leukemia has not been evident. Concerning oxLDL, an oxidative stress factor involved in acute myeloid leukemia requires further investigation and studies.
Parivash Parvasi, Zahra Fazelinejad, Fatemeh Mahdipour, Shahram Bagheri , Mohammad Momen Gharibvand ,
Volume 80, Issue 7 (10-2022)
Abstract
Background: Shear wave elastography (SWE) estimates the stiffness of a mass based on the velocity of shear wave propagation by sound waves. Due to higher cell density and angiogenesis, malignant masses have higher stiffness than benign ones.
Methods: The present study was a prospective study and was performed on patients who were referred to Ahvaz Golestan Hospital with breast mass during March 2020 to March 2021. Only patients with 4-5 BI-RAD were evaluated. Patients were graded based on ACR BI-RAD. All patients were subjected to ultrasound and selection of BI-RAD 4-5 patients for evaluation with SWE and sampling for pathology testing. In this study, in order to increase the maximum accuracy and take samples from the main location of the lesion, sampling was done by ultrasound-guided biopsy method. Tumor information was recorded by a specialist doctor after ultrasound and SWE. This information included tumor type, tumor size and grade, presence of metastasis, involvement of lymph nodes, average and maximum elasticity. SWE cutoffs were compared for mean and maximum elasticity to distinguish benign from malignant masses.
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Results: In this study, 115 patients were evaluated. 63.5% (73) of the patients had benign mass and 36.5% (42) had malignant ones. There was a significant relationship between tumor size and mean and maximum elasticity (P<0.001 The results showed that the diagnostic accuracy of SWE in identifying malignant masses compared to benign ones was 100%, so that the mean (16.61±8.03 kPa) and maximum (21.14±8.88 kPa) elasticity in benign masses were significantly lower than the mean (32.21±7.59 kPa) and maximum (91.62±8.84 kPa) elasticity of malignant masses (P<0.001). There was also a significant difference between the 4 BI-RAD subgroups, so that in BI-RAD 4a, the lowest mean and maximum elasticity were seen (P<0.001).
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Conclusion: The results showed that SWE parameters have sufficient diagnostic accuracy in diagnosing malignant breast masses. Therefore, the use of quantitative SWE parameters in conjunction with ultrasound and BI-RADS classification can avoid unnecessary biopsies.
