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Biomedical subjects

R E Moran

Publications and source records attributed to R E Moran.

At least 19 recordsLinked to original sources
PubMed2000

MRI-guided needle localization: technique.

Magnetic resonance imaging (MRI) is being used increasingly in breast cancer diagnosis. Such indications include the search for a breast primary in women with metastatic carcinoma in the axillary lymph nodes, improving surgical planning in women with a biopsy-proven breast cancer, and in screening very high-risk women. If a suspicious lesion is found by MRI, localization with either directed additional mammographic or sonographic views or with MRI-guided needle localization or biopsy is necessary. We describe the use of a biopsy device with embedded internal fiducial markers. The coordinates for needle placement are calculated by distances between the fiducial markers and the lesion. The technique is simple to master and is aided by the use of a practice phantom.

Aged↗
PubMed2000

Technique and pitfalls of ultrasound-guided core-needle biopsy of the breast.

When using ultrasound guidance to perform core-needle biopsy, the curvature of the breast can be used to advantage. By entering the breast from the periphery, chest wall injury is avoided and needle visualization is improved. Visualization of the needle is expedited by bringing the needle to the lesion by using a gentle sweeping motion while keeping the transducer relatively fixed in position. Standard techniques can be modified for difficult lesions, such as those that are mobile, deep, small, or in a large breast. Careful correlation with the mammogram will insure biopsy of the corresponding sonographic lesion. Although complications are uncommon, hematoma or infection may occur after the procedure. With practice, application of standard and modified techniques can result in efficient and accurate ultrasound-guided percutaneous core-needle biopsy of the breast.

Aged↗
PubMed1997

Evaluation of a turkey-breast phantom for teaching freehand, US-guided core-needle breast biopsy.

RATIONALE AND OBJECTIVES: Use of a turkey-breast phantom for developing freehand ultrasound (US)-guided core-needle biopsy skills was evaluated. MATERIALS AND METHODS: Thirteen diagnostic radiology trainees with varied experience in freehand US-guided breast core-needle biopsy were given instruction and allowed to practice the technique in a turkey-breast phantom. Three attempts were made before and after instruction and practice, and a questionnaire regarding experience, confidence, and anxiety was administered after these attempts. Technique, accuracy, and completion time were evaluated. RESULTS: Confidence related to procedure performance increased (P < .01), but the change in anxiety was not statistically significant. Accuracy improved, with the target being obtained in 87% of passes performed after instruction and practice versus 56% initially. Difficulty with visualizing the core needle sonographically during phantom biopsy decreased from 49% to 5% of attempts. Needle positioning perpendicular to the chest wall was observed initially in 38% of passes but was not observed after instruction and practice. There was no statistically significant change in time to complete biopsy. CONCLUSION: For teaching US-guided breast core-needle biopsy, use of a turkey-breast phantom helps improve technique, accuracy, and confidence of diagnostic radiology trainees.

Animals↗
PubMed1997

Sonographic features of mammary oil cysts.

Mammographic lesions that are pathognomonic for oil cysts require no further evaluation. Oil cysts, however, may first be discovered by ultrasonography. Between 1988 and 1995, we performed sonography of 26 oil cysts in 15 patients. Sonography was used to evaluate a palpable finding when an oil cyst was not initially perceived on the mammogram (47%) or as an initial evaluation of a palpable lump (33%); in addition, oil cysts were identified incidentally in 20% of cases. Retrospective review showed that the sonographic appearance of oil cysts is highly variable; only 8% mimic simple apocrine cysts. Twelve percent mimic an intracystic mass. Most have smooth walls (88%), are hypoechoic (65%), and have neither enhancement or shadowing (50%). The sonographic appearance of oil cysts can be suggestive of a pathologic lesion such as an intracystic carcinoma. Unnecessary biopsy can be avoided using directed mammography.

Breast Diseases↗
PubMed1984

Correlation of cell-cycle kinetics, hormone receptors, histopathology, and nodal status in human breast cancer.

DNA ploidy and percent of (%S-phase) S-phase cells were determined from the DNA content distribution of 21 benign and 76 malignant (69 primary, 7 metastatic) breast tumors using flow cytometry. All of the benign tumors were diploid, whereas 89% of the malignant tumors had measurable aneuploidy. Multiple stem-lines were observed in approximately 10% of the malignant tumors. The ploidy distribution of the malignant tumors was bimodal with an increased frequency of tumors with a near diploid DNA index (DI), and a second group with DI ranging from triploid to tetraploid. The percentage of cells in S-phase ranged from less than 1% to 37.4%. DI and %S were significantly higher in poorly differentiated duct carcinomas, medullary carcinomas, and recurrent tumor metastases. DI and %S were also significantly higher in estrogen-receptor-negative tumors. There was no correlation between DI or %S and the extent of axillary nodal metastases. However, within the groups of node-negative and node-positive patients, DI and %S were not randomly distributed but were significantly correlated with degree of nuclear differentiation. Both parameters were higher in poorly differentiated tumors compared with well-differentiated tumors, indicating significant intrastage heterogeneity in tumor ploidy and proliferation characteristics. Determination of the prognostic significance of DI and %S will require a longer follow-up time.

Breast Neoplasms↗
PubMed1984

Flow cytometric analysis of human lung cancer. Correlation with histologic type and stage.

DNA ploidy and cell-cycle characteristics of 65 operable lung cancers (41 adenocarcinomas, 19 epidermoid carcinomas, 3 large-cell carcinomas and 2 small-cell carcinomas) were analyzed using flow cytometry. Eighty percent of the tumors were aneuploid. The mean DNA index was lower in epidermoid than in adenocarcinoma. In adenocarcinoma, a low DNA index was correlated with early-stage disease; no correlation between DNA index and stage was observed in the other cell types. The %S-phase cells was highest in two cases of undifferentiated large-cell carcinoma and lowest in adenocarcinoma. The RNA index was increased approximately two-fold in all cell types. Longer follow-ups will be required to establish any correlation between the cell kinetic measurements reported here and survival times.

Adenocarcinoma↗
PubMed1983

Localization of globoside and Forssman glycolipids on erythrocyte membranes.

Using the freeze-etch technique, the membrane localization of globoside, a principal glycolipid in human erythrocytes, and Forssman antigen, the chief glycolipid in sheep erythrocytes was evaluated using ferritin and colloidal gold as morphological markers for rabbit antibodies prepared against these glycolipids. Brief trypsinization of human red cell ghosts markedly aggregated intramembranous particles and permitted labeling of globoside, which appeared in a clustered arrangement. The aggregates of ferritin-anti-globoside differed from those of ferritin-wheat germ agglutinin, a label for glycophorin, which corresponded with the aggregates of intramembranous particles. Double-labeling of human trypsinized ghosts with anti-globoside/ Staphylococcal protein A-colloidal gold and ferritin-wheat germ agglutinin indicated that the patterns of labeling were different and that the aggregates of globoside did not bear a direct relationship to the intramembranous particles, which represent transmembrane proteins. Resealed sheep erythrocyte ghosts labeled with ferritin-conjugated rabbit anti-Forssman showed small clusters of Forssman glycolipid on the erythrocyte surface, which could be markedly aggregated with a second goat anti-rabbit antibody, indicating relative mobility of the small glycolipid domains. The distribution of ferritin-anti-Forssman label in sheep ghosts treated at pH 5.5 to aggregate intramembranous particles also did not show definite correspondence between intramembranous particles and the clusters of ferritin-anti-Forssman.

Antigens, Heterophile↗
PubMed1983

Labeling indices of human lung cancer. Correlation with histologic type and survival.

The labeling index (LI) of tumor specimens from 28 patients (9 primary, 21 metastases) with lung cancer was analyzed after in vivo 3H-thymidine labeling. The mean LI was 11.1 (range, 1.4 to 37.6), and the median was 10.6. The average LI for adenocarcinoma (1.8) was significantly lower than those of small-cell, large-cell and poorly differentiated epidermoid carcinoma (12.8, 11.5 and 13.6, respectively). The variation in LI from site to site was less than 50% in 72% of lesions. Among the nonadenocarcinomas, no significant differences in average LI were observed between primary and metastatic tumors. For 17 previously untreated patients, mean survival times for patients with tumors whose LIs were below and above the mean were 63 and 30 weeks, respectively (0.10 greater than P greater than 0.05).

Adenocarcinoma↗
PubMed1981

Effects of pulse and continuous intravenous infusion of cis-diamminedichloroplatinum on L1210 leukemia in vivo.

The in vivo effects of cis-diamminedichloroplatinum on L1210 leukemia were determined using DNA content distribution analysis by flow microfluorometry and pulse [3H]thymidine labeling indices. Pulse and continuous infusion schedules were investigated. Pulse cis-diamminedichloroplatinum (2 and 6 mg/kg) resulted in progression delay of cells in S and G2 phases and at higher doses (greater than or equal to 12 mg/kg) in G1 as well. Equivalent total doses administered by continuous infusion over 24 to 72 hr delayed cells in G2 with little apparent affect on G1 or S progression. A maximum survival of 70% increased life span over controls was achieved with a 12-mg/kg pulse. Infusion doses at least 2-fold higher were required to achieve similar increases in survival. Cell cycle changes did not predict for therapeutic benefit, suggesting that, at suboptimal doses, cells were capable of repair. The therapeutic index for both modes of administration was narrow.

Animals↗
PubMed1980

The cell cycle kinetics of human breast cancer.

Cell kinetic parameters were determined in 32 patients with breast cancer following intravenous [3H]thymidine injection. The mean labelling index (LI) was 8.6, range 1.2 to 24.1. The LI increased significantly with increased stage of disease. The highest values were noted in patients with chest wall metastases with a mean LI of 15.9. In one patient with multiple discrete tumor foci, the larger foci had significantly decreased LI consistent with classic cytokinetic theory. The intralesional variation in LI was measured in 31 lesions. The average variation of LI/lesion was 1.2. Therefore, three samples should provide a representative LI. The interlesional LI was compared by taking multiple samples of two or three lesions per patient in seven patients. For each patient, there was little variation in mean LI from lesion to lesion. The data suggest that higher LI are associated with a poorer prognosis. Among patients with advanced T4 or metastatic disease, the median survivals for patients with LI less than 8 and greater than or equal to 8 were 79 weeks and 21 weeks, respectively. For patients with metastatic disease, the survivals were 56 and 9 weeks, respectively. The tumor growth fraction analyzed in one patient was 40%. In summary, the growth rate of this cancer in an individual patient is relatively homogeneous and LI may provide important prognostic information. Further studies are required to establish the value of LI in the staging and treatment of breast cancer.

Age Factors↗
PubMed1980

Synchronization of L1210 leukemia with hydroxyurea infusion and the effect of subsequent pulse dose chemotherapy.

Studies were performed to synchronize L1210 tumor cells in S phase in an effort to maximize the effect of subsequent pulse dose chemotherapy. Hydroxyurea (HU) was administered by continuous iv infusion 5 days after tumor implantation. Perturbation effects on the S-phase cells were measured by serial tritiated thymidine labeling indices. Effects on cell-cycle progression were measured by DNA content distribution analysis using flow cytometry. Synchronization of tumor cells was achieved with HU infusion (48 mg/kg/hour x 24 hours), resulting in 90% of the cells in S phase. Following infusion, synchronous progression of S-phase cells into G2/M and then G1 was apparent from +0 to +10 hours later. The susceptibility of HU-synchronized cells to subsequent chemotherapy was determined by treating mice with cytosine arabinoside (Ara-C), methotrexate (MTX), or Adriamycin (ADR) pulse doses at various intervals following infusion. Synergy, measured by prolongation of survival times, resulted when Ara-C was administered immediately after the end of the infusion. Survival times then decreased as the fraction of cells in S phase decreased. In contrast, the survival times of mice treated with MTX or ADR pulse doses after HU infusion were additive at best and did not correlate with fluctuations in the S phase compartment. Therefore, prior synchronization of tumor cells in S phase was therapeutically advantageous when coupled with appropriately timed Ara-C pulse doses. There was little advantage in combining HU infusion with subsequent MTX or ADR therapy.

Animals↗
PubMed1980

A method for establishing prolonged intravenous infusions in mice.

A simple and rapid method for establishing prolonged intravenous infusions in mice was developed. The major advantages of this system were ease of establishing infusions, ability to infuse large numbers of mice simultaneously, low incidence or perivenous infiltration, and little apparent stress to the mouse.

Animals↗