Concentrations In Carcinoma Research Articles

Evaluation of optimal acquisition delays of DECT iodine maps in pancreatic adenocarcinoma: A potential alternative to the Patlak model of CT perfusion

IntroductionBy using bolus tracking with an appropriate acquisition delay dual-energy computed tomography (DECT) iodine maps might serve as a replacement of CT perfusion maps at reduced radiation exposure. This study aimed to evaluate the optimal acquisition delays of DECT for the replacement of parameter maps calculated with the Patlak model in pancreatic adenocarcinoma by corresponding iodine maps. Materials and methodsDual-source dynamic DECT acquisitions at 80 kVp/Sn140 kVp of 14 patients with pancreatic carcinoma were used to calculate CT perfusion maps of blood volume and permeability with the Patlak model. DECT iodine maps were generated from individual DECT acquisitions, matching acquisition times relative to prior bolus-triggered three-phase CT acquisitions for investigating different acquisition delays. Correlation between perfusion parameters and iodine concentrations was determined for acquisition delays between −6 s and 33 s. ResultsCorrelation between iodine concentrations and perfusion parameters ranged from −0.05 to 0.63 for blood volume and from −0.05 to 0.71 for permeability, depending on potential trigger delay. The correlation was significant for potential acquisition delays above 1.5 s for blood volume and above 9.0 s for permeability (both p < 0.05). Maximum correlation occurred at an acquisition delay of 15.0 s for blood volume (r = 0.63) and at 25.5 s for permeability (r = 0.71), with significantly lower iodine concentrations in carcinoma (15.0 s: 1.3 ± 0.5 mg/ml; 22.5 s: 1.4 ± 0.7 mg/ml) than in non-neoplastic pancreatic parenchyma (15.0 s: 2.3 ± 0.8 mg/ml; 22.5 s: 2.4 ± 0.6 mg/ml; p < 0.05). DiscussionIn the future, well-timed DECT iodine maps acquired with bolus tracking could provide an alternative to permeability and blood volume maps calculated with the Patlak model.

Abstract IA8: Discovering drivers in rare ovarian cancer subtypes

Abstract Over the past several years it has become accepted that subtypes of ovarian carcinomas (high grade serous, endometriod, clear cell, low grade serous and mucinous carcinoma) are discrete diseases. Therefore, if we are to improve ovarian cancer morbidity and mortality, cancer prevention, early detection and/or screening strategies must be developed to deal with the challenges posed by each of these diseases. Whereas high grade serous carcinoma is relatively common, the other ovarian carcinoma subtypes represent 30% of cases in total and therefore are all rare. Rare cancers are usually marked by a combination of an unusual cells of origin and unusual mutations or other genomics drivers. We have undertaken a series of genomics studies to identify key drivers in rarer ovarian cancers. Some cancers such as granulosa cell tumors of the ovary and sertoli cell mutations have been found which are either pathognomonic or highly specific for that cancer type. Those mutations have great promise as diagnostics. Since the target cancers are rare such work is not possible without broad ranging international collaborations. For more common entities such as clear cell carcinoma concentrations of mutations can be found such as mutations in ARID1a. As such mutations are nonspecific they are less likely to be used diagnostically however this increases their potential therapeutic value. However, it is likely that the mutations or mutated genes have a specific role in the cell of origin of the cancers involved and therefore cell context specific cell lines of model systems will be required for functional validation. Although rare cancers are by definition unusual and therefore represent smaller medical problems they are of course highly significant to the patients involved and provide a model through which the stratification of management for common cancers can be undertaken. Citation Format: David G. Huntsman. Discovering drivers in rare ovarian cancer subtypes. [abstract]. In: Proceedings of the AACR Special Conference on Advances in Ovarian Cancer Research: From Concept to Clinic; Sep 18-21, 2013; Miami, FL. Philadelphia (PA): AACR; Clin Cancer Res 2013;19(19 Suppl):Abstract nr IA8.

Local calprotectin production in colorectal cancer and polyps—active neutrophil recruitment in carcinogenesis

The aim of this study is to examine the expression level and localization of calprotectin in cancer tissue, tumor-adjacent mucosa, and polyps in colonic biopsies. Calprotection expression was correlated with neutrophil infiltration, markers of bacteremia, and systemic inflammation. Patients with colorectal cancer (n = 28) and adenoma (n = 38) were compared with healthy controls (n = 33). Calprotectin expression levels were measured by ELISA, and its localization was visualized by immunohistochemistry and correlated with the degree of neutrophil infiltration (visualized by Esterase staining). The expression of tumor necrosis factor (TNF)-alpha, procalcitonin, endotoxemia, carcinoembryonic antigen (CEA), and C-reactive protein was also investigated. Mucosal calprotectin was expressed in significantly higher concentrations in carcinoma (94.2 ± 31.2ng/mg total protein) and adenoma (122.8 ± 60.3ng/mg total protein) in comparison with mucosal biopsies from healthy controls (20.4 ± 5.4ng/mg total protein), tumor-adjacent mucosa from patients with colorectal carcinoma (21.6 ± 5.1ng/mg total protein), and adenoma (45 ± 14.6ng/mg total protein, all p < 0.05). Immunohistochemistry showed calprotectin reactivity mainly in granulocytes and macrophages with only singular reactive epithelial cells. Positive staining (quantified by the number of positive cells per square millimeter) was markedly increased in carcinoma tissue (85 ± 21.5) and in adenoma (67.5 ± 20) as compared with tumor-adjacent epithelia (18.8 ± 4.3, p = 0.0007, p = 0.003, respectively), and there was a highly significant correlation, r = 0.89, p = 0.001) between calprotectin staining and neutrophil infiltration. No significant differences were found in the systemic levels of TNF-alpha, procalcitonin, and endotoxemia, whereas CEA and C-reactive protein levels were significantly higher in the cancer group (p < 0.05). Our results support the evidence that increased calprotectin expression is an early step in the neoplastic transformation during colorectal carcinogenesis. Moreover, its expression is closely related to an inflammatory response and points out a possible biological link between inflammation and neoplastic transformation in colorectal cancer.

CD44-v6 concentrations in carcinoma of the uterine cervix: lack of prognostic significance

Several kinds of cellular adhesion molecules, like different splicing variants of CD 44, have gained important as prognostic or markers for metastatic disease. Fresh frozen samples from 64 cervical carcinoma (CX) were stored in liquid nitrogen and examined using ELISA-technique, testing the prognostic impact. Normal cervical tissue served as control. CD 44-v6 concentration, was significant elevated in tumor tissue, when compared to the controls (P=0.04). There was no correlation to tumor stage (P=0.61), lymphovascular space involvement (P=0.075) or pelvic lymph node involvement (P=0.81). The CD 44-v6 concentration was not informative regarding recurrence-free and overall survival. Contrary to immunohistochemistry, the quantification of CD 44-v6 using ELISA-technique does not provide any further information.

Removal of Hepatocarcinoma Cells From Blood via Cell Washing and Filtration Techniques

Utilization of autotransfusion during tumor resection remains controversial due to viability of carcinoma cells remaining in collected blood. The purpose of this study was to evaluate autotransfusion techniques combined with leukocyte depleting filters (LDF) for removal of hepatocarcinoma cells from autotransfusate. An in vitro model was created by contaminating expired human erythrocytes with cultured hepatocarcinoma (HEP G2) cells. Autotransfusion devices evaluated were Cobe BRAT2, Sorin STAT-P, and Fresenius CATS. Autotransfusate collected from varying processing conditions were filtered using the Pall Leukoguard RS or Pall Purecell RCQ LDF. Carcinoma concentrations were quantified via Coulter Counter technology. The CATS exhibited higher concentrations of cancer cells in the autotransfusate prior to washing, a 449% increase. This was significantly higher than either the BRAT2 or STAT-P, 350% and 315% respectively. Post washing HEP G2 concentrations in the BRAT2 were significantly higher than the STAT-P and CATS. Doubled wash volumes removed more HEP G2 cells in all trials, reaching statistical significance only in the CATS. LDF resulted in a significant 75% reduction of HEP G2 cells, with no difference between filters. While combination use of autotransfusion devices and leukocyte depleting filters did result in a product with concentrated hematocrit, no technique removed all hepatocarcinoma cells.

Biliary heavy metal concentrations in carcinoma of the gall bladder: case-control study

Carcinoma of the gall bladder is the third most common malignancy of the gastrointestinal tract in the eastern Uttar Pradesh and western Bihar regions of India.1 The two regions lie...

Polyamine Concentrations in Pancreatic Tissue, Serum, and Urine of Patients with Pancreatic Cancer

We investigated the total, free, and acetylated polyamine concentrations in pancreatic tissue, serum, and urine of 20 patients with pancreatic cancer, 30 healthy volunteers, and 40 patients with nonmalignant, gastrointestinal diseases by reversed-phase liquid chromatography. Tissue concentrations in carcinoma compared to histologically unaffected pancreas were significantly higher for putrescine, elevated for cadaverine, and nearly identical for spermidine and spermine, while N1-acetylspermidine was detectable in cancer tissue only. With the exception of free spermine in urine and total spermine in serum, all other polyamines were significantly elevated in the urine and serum of cancer patients compared to healthy controls. These data support the concept that polyamines play an important role in rapidly growing tissues. However, nonmalignant gastrointestinal diseases partly showed similar elevations. Because of this low specificity, polyamines are of little value only as diagnostic markers of pancreatic carcinoma. Since polyamine concentrations normalized in patients after curative operation while they were further elevated in patients with tumor relapse or metastases, polyamines might play a clinical role in predicting therapeutic success or indicating relapse of the tumor. A significant linear correlation of polyamine concentrations and the size of the tumor was found while a significant correlation to CEA, CA 19-9, and CA 125 or the presence of organ metastases did not exist.

Low serum testosterone concentrations in carcinoma of the pancreas

Low serum testosterone concentrations in carcinoma of the pancreas

Preoperative use of 5-fluorouracil suppository for carcinoma of the rectum

A total of 50 patients with carcinoma of the rectum were treated with 5-fluorouracil suppository before operation. The suppository, which was made of Witepsol suppository base containing 5-fluorouracil, yielded high drug concentrations in carcinoma, draining blood and regional lymph nodes. As a clinical response to the suppository, a significant decrease in the size of tumor mass was noted in 8 of 50 carcinomas, but in other cases the gross change was unmeasurable. Thirty-three percent of the surgically resected carcinomas were histologically judged to have responded to the suppository. In such cases, histologic changes correlated well with the total dose of 5-fluorouracil. The adverse effects of the suppository were confined to anal pain, tenesmus and anal bleeding, probably due to the topical effect of 5-fluorouracil on the rectal mucosa.

Progesterone and estradiol concentration in human kidney and renal cell carcinoma

Renal carcinoma and renal tissue, five each, were analyzed for their concentration of progesterone (P) and estradiol-17-β (E 2). Concentrations of these steroids were also measured in blood samples from each of the five patients. The mean plasma P and E 2 concentrations were 0.5 ng/ml and 44.8 pg/ml. The tissue concentrations of P were 8.2 ng/g and 5.9 ng/g for normal kidney and carcinoma tissue respectively. The difference between the two values was significant ( P < 0.025). The difference between the Ei concentrations in carcinoma (238 pg/g) and normal tissue (306 pg/g) was not significant. Although the biological significance of the relatively high concentrations of these steroids in renal tissue is not yet clear, the present data are consistent with recent findings of the presence of E 2 and P receptors in renal carcinoma and in normal kidney.

The diagnostic value of determinations of serum leucine aminopeptidase concentrations in carcinoma of the pancreas.

The serum concentration and urine excretion of LAP was determined by the method of Goldbarg and Rutenburg in 187 patients.