A field programmable gate array-based time-resolved scaler for collinear laser spectroscopy with bunched radioactive potassium beams

A new data acquisition system including a Field Programmable Gate Array (FPGA) based time-resolved scaler was developed for laser-induced fluorescence and beam bunch coincidence measurements. The FPGA scaler was tested in a collinear laser-spectroscopy experiment on radioactive (37)K at the BEam COoler and LAser spectroscopy (BECOLA) facility at the National Superconducting Cyclotron Laboratory at Michigan State University. A 1.29 μs bunch width from the buncher and a bunch repetition rate of 2.5 Hz led to a background suppression factor of 3.1 × 10(5) in resonant photon detection measurements. The hyperfine structure of (37)K and its isotope shift relative to the stable (39)K were determined using 5 × 10(4) s(-1) (37)K ions injected into the BECOLA beam line. The obtained hyperfine coupling constants A((2)S(1/2)) = 120.3(1.4) MHz, A((2)P(1/2)) = 15.2(1.1) MHz, and A((2)P(3/2)) = 1.4(8) MHz, and the isotope shift δν(39, 37) = -264(3) MHz are consistent with the previously determined values, where available.

Patients' lived seclusion experience in acute psychiatric hospital in the United States: a qualitative study

The findings revealed that the patients perceived seclusion as an intervention that is punitive and a means used by the staff to exert control. Patients perceived that staff incitements and lack of communication skills led to their being secluded. The findings provided recommendations and strategies for seclusion reduction that were based on the patients' first-hand seclusion experiences. This phenomenological study used Husserlian's philosophy to explore and describe the lived experiences of psychiatric patients who were secluded at a free-standing acute care hospital located in South-western United States (US). The study is crucial because very few studies have been conducted in this area in the US. The study examined a purposive sample of 20 patients, 3 days post-seclusion. Data were generated through face-to-face, semi-structured interviews incorporating open-ended questions and probes to facilitate discussion until saturation was reached. Interviews were transcribed verbatim and data analysed using Colaizzi's seven steps method. Results were described according to the themes and subthemes identified. Findings uncovered four themes: (1) alone in the world; (2) staff exert power and control; (3) resentment towards staff; and (4) time for meditation. The findings from this study illuminated the views surrounding patients' seclusion experience. It provided first-hand information on the patients' seclusion experience that might be helpful to the mental health professionals in the seclusion reduction process.

Circumferential resection margin (CRM) positivity after MRI assessment and adjuvant treatment in 189 patients undergoing rectal cancer resection

PURPOSE

The management of rectal cancer relies on accurate MRI staging. Multi-modal treatments can downstage rectal cancer prior to surgery and may have an effect on MRI accuracy. We aim to correlate the findings of MRI staging of rectal cancer with histological analysis, the effect of neoadjuvant therapy on this and the implications of circumferential resection margin (CRM) positivity following neoadjuvant therapy.

METHODS

An analysis of histological data and radiological staging of all cases of rectal cancer in a single centre between 2006 and 2011 were conducted.

RESULTS

Two hundred forty-one patients had histologically proved rectal cancer during the study period. One hundred eighty-two patients underwent resection. Median age was 66.6 years, and male to female ratio was 13:5. R1 resection rate was 11.1%. MRI assessments of the circumferential resection margin in patients without neoadjuvant radiotherapy were 93.6 and 88.1% in patients who underwent neoadjuvant radiotherapy. Eighteen patients had predicted positive margins following chemoradiotherapy, of which 38.9% had an involved CRM on histological analysis.

CONCLUSIONS

MRI assessment of the circumferential resection margin in rectal cancer is associated with high accuracy. Neoadjuvant chemoradiotherapy has a detrimental effect on this accuracy, although accuracy remains high. In the presence of persistently predicted positive margins, complete resection remains achievable but may necessitate a more radical approach to resection.

Systematic review and meta-analysis of continuous local anaesthetic wound infiltration versus epidural analgesia for postoperative pain following abdominal surgery

BACKGROUND

Local anaesthetic wound infiltration techniques reduce opiate requirements and pain scores. Wound catheters have been introduced to increase the duration of action of local anaesthetic by continuous infusion. The aim was to compare these infiltration techniques with the current standard of epidural analgesia.

METHODS

A meta-analysis of randomized clinical trials (RCTs) evaluating wound infiltration versus epidural analgesia in abdominal surgery was performed. The primary outcome was pain score at rest after 24 h on a numerical rating scale. Secondary outcomes were pain scores at rest at 48 h, and on movement at 24 and 48 h, with subgroup analysis according to incision type and administration regimen(continuous versus bolus), opiate requirements, nausea and vomiting, urinary retention, catheter-related complications and treatment failure.

RESULTS

Nine RCTs with a total of 505 patients were included. No differences in pain scores at rest 24 h after surgery were detected between epidural and wound infiltration. There were no significant differences in pain score at rest after 48 h, or on movement at 24 or 48 h after surgery. Epidural analgesia demonstrated a non-significant a trend towards reduced pain scores on movement and reduced opiate requirements. There was a reduced incidence of urinary retention in the wound catheter group.

CONCLUSION

Within a heterogeneous group of RCTs, use of local anaesthetic wound infiltration was associated with pain scores comparable to those obtained with epidural analgesia. Further procedure-specific RCTs including broader measures of recovery are recommended to compare the overall efficacy of epidural and wound infiltration analgesic techniques.

Ly6e expression is restricted to syncytiotrophoblast cells of the mouse placenta

In the present study, we characterized the expression of lymphocyte antigen 6, locus E (Ly6e) in mouse placental trophoblast. We identified Ly6e mRNA expression in trophoblast stem (TS) cells by a gene expression screen. In vivo, Ly6e was first detectable by mRNA in situ hybridization in the chorion beginning at E8.5 with spatial expression similar to Syncytin a (Syna). At later stages of gestation, Ly6e was restricted to syncytiotrophoblast in the labyrinth. Northern blot confirmed that Ly6e was expressed in both undifferentiated and differentiated TS cell cultures but that its expression increased with differentiation. FACS analysis confirmed these results and allowed us to isolate LY6E⁺ cells, which we found to express Syna at a much higher level than did LY6E⁻ cells. Our findings suggest that LY6E is expressed in differentiated syncytiotrophoblast and may also be useful as an early marker, expressed in progenitors of this cell-type.

Negative predictive value of surveillance PET/CT in head and neck squamous cell cancer

BACKGROUND AND PURPOSE

Optimizing the utilization of surveillance PET/CT in treated HNSCC is an area of ongoing research. Our aim was to determine the negative predictive value of PET/CT in patients with treated head and neck squamous cell cancer and to determine whether negative PET/CT reduces the need for further imaging surveillance.

MATERIALS AND METHODS

We evaluated patients with treated HNSCC who underwent posttreatment surveillance PET/CT. During routine clinical readouts, scans were categorized as having negative, probably negative, probably malignant, or malignant findings. We followed patients clinically and radiographically for at least 12 months from their last PET/CT (mean, 26 months; median, 28 months; range, 12-89 months) to determine recurrence rates. All suspected recurrences underwent biopsy for confirmation.

RESULTS

Five hundred twelve patients (1553 scans) were included in the study. Two hundred fourteen patients had at least 1 PET/CT with negative findings. Of the 214 patients with a scan with negative findings, 19 (9%) eventually experienced recurrence, resulting in a NPV of 91%. In addition, a subgroup of 114 patients with 2 consecutive PET/CT examinations with negative findings within a 6-month period was identified. Only 2 recurrences were found in this group, giving a NPV of 98%.

CONCLUSIONS

In patients treated for HNSCC, a single PET/CT with negative findings carries a NPV of 91%, which is not adequate to defer further radiologic surveillance. Two consecutive PET/CT examinations with negative findings within a 6-month period, however, resulted in a NPV of 98%, which could obviate further radiologic imaging in the absence of clinical signs of recurrence.

Abstract P1-01-13: Patterns of definitive axillary management in the era prior to reporting ACOSOG Z0011: comparison between NCCN Centers and hospitals in Michigan

Background: The results of the ACOSOG- Z0011 trial have had potential practice changing implications for the management of patients with positive sentinel lymph node (SLN) undergoing lumpectomy and radiation for breast cancer. However, some evidence suggests a shift in axillary management even prior to the initial report of data supporting sentinel lymph node biopsy (SLNB) alone in mid-2010. We analyzed data in the National Comprehensive Cancer Network (NCCN) outcomes database from NCCN centers and the Michigan Breast Oncology Quality Initiative (MiBOQI) hospitals to examine institutional practice patterns with respect to use of completion axillary dissection (CALND) for SLN positive breast cancer in the years leading up to publication of these trial results. We hypothesized that CALND would be omitted more frequently in women treated at NCCN centers compared to those treated at MiBOQI programs.

Methods: We identified 2,172 women with clinical T1/T2 N0 breast cancer who underwent breast surgery and SLNB and had a positive SLN from 2007 through 2010 at one of 12 participating NCCN centers or 12 MiBOQI sites. Patient and tumor characteristics, definitive breast procedure, year of diagnosis, and institutional affiliation were analyzed as predictors of use of SLNB alone in univariate Chi-Square and multivariable logistic regression models.

Results: CALND was omitted in 314 (14.5%) of the 2,172 patients. Over time, there was a dramatic increase in the use of SLNB alone (12% in 2007 to 23% in 2010). In the univariate analyses, increased patient age, later year of diagnosis, lower T stage, and lower pathologic N stage were significant predictors of use of SLNB alone (all p < .0001). There was no association between definitive breast surgery type, hormone receptor status, Her-2 Neu status, or institutional affiliation and use of SLNB alone. In the multivariable model, older age at diagnosis, later year of diagnosis, and lower pathologic N stage remained significant independent predictors of SLNB alone. There were no significant differences in rates of omission of CALND between NCCN and MIBOQI sites.

The disparity of priapulid, archaeopriapulid and palaeoscolecid worms in the light of new data

Priapulids and their extinct relatives, the archaeopriapulids and palaeoscolecids, are vermiform, carnivorous ecdysozoans with an armoured, extensible proboscis. These worms were an important component of marine communities during the Palaeozoic, but were especially abundant and diverse in the Cambrian. Today, they comprise just seven genera in four families. Priapulids were among the first groups used to test hypotheses concerning the morphological disparity of Cambrian fossils relative to the extant fauna. A previous study sampled at the generic level, concluding that Cambrian genera embodied marginally less morphological diversity than their extant counterparts. Here, we sample predominantly at the species level and include numerous fossils and some extant forms described in the last fifteen years. Empirical morphospaces for priapulids, archaeopriapulids and palaeoscolecids are relatively insensitive to changes in the taxon or character sample: their overall form has altered little, despite the markedly improved sampling. Cambrian and post-Cambrian genera occupy adjacent rather than broadly overlapping regions of these spaces, and Cambrian species still show lower morphological disparity than their post-Cambrian counterparts. Crucially, the significance of this difference has increased with improved taxon sampling over research time. In contrast with empirical morphospaces, the phylogeny of priapulids, archaeopriapulids and palaeoscolecids derived from morphological characters is extremely sensitive to details of taxon sampling and the manner in which characters are weighted. However, the extant Priapulidae and Halicryptidae invariably resolve as sister families, with this entire clade subsequently being sister group to the Maccabeidae. In our most inclusive trees, the extant Tubiluchidae are separated from these other living taxa by a number of small, intervening fossil clades.

Search for neutrinoless double-beta decay in 136Xe with EXO-200

We report on a search for neutrinoless double-beta decay of 136Xe with EXO-200. No signal is observed for an exposure of 32.5 kg yr, with a background of ∼1.5×10(-3)  kg(-1) yr(-1)  keV(-1) in the ±1σ region of interest. This sets a lower limit on the half-life of the neutrinoless double-beta decay T(1/2)(0νββ)(136Xe)>1.6×10(25)  yr (90% C.L.), corresponding to effective Majorana masses of less than 140-380 meV, depending on the matrix element calculation.

P4-20-02: Inflammatory Breast Cancer (IBC) in the National Comprehensive Cancer Network (NCCN): The Disease, the Recurrence Pattern and the Outcome

Background

Inflammatory breast cancer (IBC) is a unique clinicopathologic entity that is characterized by rapid progression and aggressive behavior from the onset. The clinical presentation consists of erythema, rapid enlargement of the breast, skin ridging, and a characteristic peau d'orange appearance of the skin secondary to dermal lymphatic tumor involvement. Because of its uncommon presentation leading to frequent misdiagnosis, most reports are from small single institution series which describe a predictable pattern of recurrence in spite of appropriate multidisciplinary treatments. We sought to confirm these observations using the large multi-institutional National Comprehensive Cancer Network (NCCN) outcomes database.

Methods: Patients (pts) with newly diagnosed IBC treated between 1999 and 2009 at 12 participating NCCN institutions were identified. The clinical diagnoses of IBC was based on the AJCC definition and staged as clinical T4d, N0-3, M0-1. The baseline pathological characteristics included histological type, estrogen receptor (ER), progesterone-receptor (PR), and HER-2/neu status. Pts were classified as receiving multimodality therapy if they received two of the following three treatments: surgery (lumpectomy or mastectomy), perioperative (neoadjuvant or adjuvant) systemic therapy, or perioperative radiation therapy.

Results: We identified a cohort of 673 pts with newly diagnosed IBC with a median follow-up of 28.9 months. Of which 195 (29%) had metastatic disease at presentation. The median age at presentation was 52.6 years. Caucasians were 79.4% of the cohort, African American 9.7%, and 11.0% other ethnic groups. Invasive ductal type comprised 84% of histologies. Biomarker assessment revealed ER+ (44.7%), PR+ (34.3%), and Her2/neu+ (33.4%). LVI was documented in 53.3%. Of stage III patients, 75.7% pts received perioperative radiation, 82% received perioperative systemic therapy and 70.7% underwent surgery. All three modalities were received by 64.4% of women. Of the stage III pts, 203 recurred. The most frequent sites of recurrence for were CNS (20.2%), bone (17.2%), chest wall (13.8%), lung (12.3%), liver (11.3%), distant (7.4%) and regional lymph nodes (6.9%). With a median of 30 and 20 months of follow-up for stage III & IV respectively, the median survival was 66 months (95% CI 54–107) for stage III pts and 26 months (95% CI: 22–33) for stage IV Among the 82% of stage III pts who received multimodality therapy, the 5 year and 10 year OS of 62% and 47%.

Discussion: This is a large retrospective multiinstitutional study that confirms the aggressive clinical features, recurrence patterns and adverse prognosis of IBC described in previous single institution series. Even with aggressive multimodal therapy, the long term survival of IBC shorter is than non-IBC. Future investigations are needed to address the aggressive biology of IBC to improve diagnosis and therapy.

Citation Information: Cancer Res 2011;71(24 Suppl):Abstract nr P4-20-02.

First Report of Laurel Wilt Disease Caused by Raffaelea lauricola on Pondspice in Florida

Laurel wilt is a fungal vascular disease of redbay (Persea borbonia (L.) Spreng) and other plants in the family Lauraceae in the southeastern United States (1). The disease is caused by Raffaelea lauricola T. C. Harr., Fraedrich & Aghayeva, which is vectored by the exotic redbay ambrosia beetle (Xyleborus glabratus Eichhoff) (2). Pondspice (Litsea aestivalis (L.) Fern.) is an obligate wetland shrub listed as endangered in Florida and Maryland and threatened in Georgia (4). On 29 August 2008, 369 of 430 (85%) pondspice trees observed at St. Marks Pond in St. John's County, Florida were dead and/or dying (4). Stem samples were collected from plants with wilted and reddened foliage, entrance holes with boring dust characteristic of ambrosia beetle attack, and dark discoloration in the outer sapwood. Discolored stem sections were surface disinfested for 30 s in a 5% sodium hypochlorite solution and then plated onto cycloheximide streptomycin malt extract agar (1). Smooth, cream-buff, submerge hyphae with uneven margins resembling R. lauricola (2) was observed growing from all sapwood pieces. DNA was extracted from a single isolate (PL 392) and the 18s small subunit rDNA was PCR amplified and sequenced with primers NS1 and NS4 (3), resulting in a 1,026-bp amplicon. A BLASTn search showed identical homology to R. lauricola strain PL 159 (GenBank Accession No. EU257806). The 18s small subunit rDNA sequence was deposited into GenBank (FJ514097). In May 2011, a spore suspension was made by flooding a single-spore culture plate of isolate PL 392 with 2 ml of sterile water, collecting the spores by pipette, and quantification by hemacyometer to 1.5 × 10⁶ spores/ml. Pathogenicity tests were conducted on 1 to 1.5 m tall pondspice plants. Six saplings were wounded by a 3/32-inch drill bit, with four receiving 50 μl of the spore suspension and two serving as water-inoculated controls. All plants were kept in a greenhouse under ambient temperature. Within 21 days, all fungal-inoculated saplings displayed complete canopy wilt, typical of laurel wilt. R. lauricola was later recovered from all four infected plants, completing Koch's postulates. To determine if the vector can reproduce in pondspice, infected stem sections were placed in a plastic rearing box indoors at room temperature, and both callow and mature adult female X. glabratus emerged in October and November 2008. Although laurel wilt has been previously observed on pondspice in South Carolina and Georgia (1), this is the first confirmation of the disease on pondspice in Florida and the first confirmation of the vector from stem material of this host. References: (1) S. W. Fraedrich et al. Plant Dis. 92:215, 2008. (2) T. C. Harrington et al. Mycotaxon 104:399, 2008. (3) M. A. Innis et al. PCR Protocols, A Guide to Methods and Applications. Academic Press. San Diego, CA, 1990. (4) J. A. Surdick and A. M. Jenkins. Pondspice (Litsea aestivalis) Population Status and Response to Laurel Wilt Disease in Northeast Florida. Florida Natural Areas Inventory, Tallahassee, FL, 2009.

Observation of two-neutrino double-beta decay in 136Xe with the EXO-200 detector

We report the observation of two-neutrino double-beta decay in (136)Xe with T(1/2) = 2.11 ± 0.04(stat) ± 0.21(syst) × 10(21) yr. This second-order process, predicted by the standard model, has been observed for several nuclei but not for (136)Xe. The observed decay rate provides new input to matrix element calculations and to the search for the more interesting neutrinoless double-beta decay, the most sensitive probe for the existence of Majorana particles and the measurement of the neutrino mass scale.

A magnetically driven piston pump for ultra-clean applications

A magnetically driven piston pump for xenon gas recirculation is presented. The pump is designed to satisfy extreme purity and containment requirements, as is appropriate for the recirculation of isotopically enriched xenon through the purification system and large liquid xenon time projection chamber of EXO-200. The pump, using sprung polymer gaskets, is capable of pumping more than 16 standard liters per minute of xenon gas with 750 Torr differential pressure.