An investigation of a personal norm of condom-use responsibility among African American crack cocaine smokers

The purpose of this study was to investigate the unique contribution of a personal norm of condom-use responsibility to the formation of intentions to use male condoms during vaginal sex. Data were collected from 402 male and 157 female heterosexual African American crack cocaine smokers in Houston, Texas, US. Two structural equation models of the intention to use a condom with the last sex partner were estimated. One model included measures of condom-use attitudes, subjective norms and condom-use self-efficacy. A second model included these three measures and a fourth measure of a personal norm of condom-use responsibility. Separate models were estimated for men and women. The addition of a personal norm of condom-use responsibility provided a significantly better fit to the data than did models including only outcome expectations, subjective norms and self-efficacy. Results also showed distinctly different underlying cognitive structures of condom-use intention for men and women. A personal norm of condom-use responsibility had a strong direct effect on men's intentions to use condoms with the last sex partner. Other variables appeared to have no direct effect on men's intentions. Women's intentions were strongly influenced by a personal norm and social subjective norms. Situational self-efficacy and outcome expectations had weaker, yet significant, effects on women's intentions. Given the strong effect of personal norms on men's intentions to use condoms, further research should be undertaken.

The influence of disclosure of HIV diagnosis on time to disease progression in a cohort of Romanian children and teens

The Joint United Nations Programme on HIV/AIDS (UNAIDS) estimates that in 2004, there were 39.4 million people living with HIV/AIDS worldwide (UNAIDS/WHO Report on the global HIV/AIDS epidemic, 2004). Children less than 15 years of age comprise 2.2 million of these individuals. As more children globally gain access to highly active antiretroviral therapy (HAART), more children are growing to the age when disclosure of their HIV status is inevitable. This information may affect a child's disease trajectory, and in the context of HAART, may have wide-ranging impact in the management of paediatric HIV infection. This study is an investigation of the effect of disclosure of a child's own HIV infection status on death and CD4 decline in a cohort of 325 HIV-infected Romanian children receiving highly active antiretroviral therapy (HAART). A retrospective database analysis was conducted. Data from a nearly three-year period were examined. Children who were aware of their HIV diagnosis were compared with those who were not aware. We found significant associations between not knowing the HIV diagnosis and death, and not knowing the HIV diagnosis and disease progression defined as either death or CD4 decline. Our results imply that in the context of HAART, knowledge of one's own HIV infection status is associated with delayed HIV disease progression.

CD4+ T cells transfer resistance against Citrobacter rodentium-induced infectious colitis by induction of Th 1 immunity

Citrobacter rodentium induces an acute, self-limited colitis in mice which is histologically associated with crypt hyperplasia. The infection serves as a model for human infectious colitis induced by enteropathogenic Escherichia coli. We investigated if Balb/c mice, which had spontaneously cleared C. rodentium infection, were protected against re-infection and if resistance against intestinal infection can be systemically transferred using spleen cells. The course of infection was monitored by faecal excretion. Spleen cells, splenic CD3+ and CD4+ cells were transferred from resistant mice to non-infected recipients prior to infection. Cytokine secretion, serum and faecal antibody titres and histological disease severity were assessed. Balb/c mice were resistant against re-infection. The course of infection was shorter in mice receiving primed spleen cells, CD3+ and CD4+ cells. Transfer of CD4+ T cells from resistant mice induced gamma-interferon, interleukin (IL)-2 and IL-17 secretion and suppressed IL-10 secretion. Anti-Citrobacter serum IgG1 and IgG2a enzyme-linked immunosorbent assay OD levels were increased. Faecal IgA secretion was increased while serum IgA was suppressed in recipients of CD4+ cells. Large bowel histology showed protection from colitis in recipients of primed cells as indicated by normal colonic epithelium. In Balb/c mice, C. rodentium infection is followed by resistance, which can be transferred by CD4+ cells. Transfer of protection is associated with IL-17 secretion, enhanced serum IgG and faecal IgA secretion. This is the first study to demonstrate the mechanisms by which systemic resistance from previously C. rodentium-infected mice can be transferred to non-infected animals.

Early experience with the TriMed fragment-specific fracture fixation system in intraarticular distal radius fractures

This paper reports the results of fixation of intraarticular fractures of the distal radius using the TriMed fragment-specific fixation system by surgeons early in their experience with the system. A consecutive series of 22 AO types C2 and C3 fractures in 21 patients were internally fixed with the system. Restoration of articular congruity to less than 2 mm was possible in 20 fractures. At a minimum of 6 months follow-up, mean volar and radial inclination were 8 degrees and 25 degrees , respectively, with no loss of reduction. The patients had a mean of 50 degrees flexion, 63 degrees extension and a pronation-supination arc of 149 degrees . The mean subjective Patient Rated Wrist Score was 20. Our complication rate was comparable to other published series despite long operating times. Therefore, we commend the system as a powerful tool to treat these difficult fractures but acknowledge the significant learning curve.

A phase I dose escalation study of selenomethionine (SLM) in combination with fixed dose irinotecan (Iri) in patients with solid tumors

2574

Background: SLM reduces Iri toxicity in xenograft models at associated selenium (Se) concentrations (Con) = 15μM. We conducted a phase I clinical trial of a fixed dose Iri with escalating doses of SLM in order to identify the highest safe dose of SLM that achieves and maintains Se Conc > 15μM. Methods: A standard 3–3 escalation was conducted. Iri was given at 125mg/m2/week x 4 weeks every 6 weeks. SLM was started 1 week prior to 1st dose of Iri. A loading BID dose of SLM was given for 1 week, followed by a daily maintenance dose. Selenium trough levels were obtained on days 8 and 29 of the study (days 1 and 22 irinotecan) and once every 6 week-cycle. Seven dose-levels of SLM were investigated (loading/maintenance, in mcg): 3,200/2,800, 3,200/3,200, 4,000/3,200, 4,000/4,000, 4,800/4,800, 5,600/5,600, and 7,200/7,200. Results: 31 patients enrolled on this study: age (median 57, range 21–80), Male/Female 21/10, ECOG 0/1 (15/16), 31 with prior chemotherapy, 12 with prior radiation, 22 colorectal and 9 mixed solids. Dose escalation was successful up to dose level 7 (7,200mcg SLM PO BID × 1 week followed by 7,200mcg SLM PO QD), which was declared the recommended dose. 2 Dose limiting toxicities occurred on study: one DLT of Grade (G) 3 febrile neutropenia, G3 sepsis, G3 dehydration occurred on dose-level 1; one DLT of G3 febrile neutropenia, dehydration occurred on dose-level 7. Both DLT occurred in a setting of partial small bowel obstruction related to peritoneal carcinomatosis. Non-DLT = G3 treatment-related toxicities included: 3 G3 neutropenia (< 1 week) at DL2, 3 & 7; 2 G3 diarrhea lasting < 48 hours on DL5 & 7. A lower incidence of G2+ toxicities was noted in patients with higher Se Conc (86% for Se < 15; 67% for Se 15–20; 57% for Se> 20 μM). Toxicities related to SLM were limited to garlic-like smell to breath, sweat, and urine in few patients. Responses included 7 confirmed stable diseases and 2 confirmed partial responses. A Se Con > 15 μM was achieved at all SLM dose levels of 4,800 mcg and above. Conclusions: Doses of SLM up to 7,200 mcg BID × 7 days followed by 7,200 mcg QD can be administered safely with standard doses of Iri. Formal phase II and III studies are needed to determine if SLM reduces Iri toxicity.

No significant financial relationships to disclose.

Outcome analysis for melanoma patients undergoing deep pelvic lymph node dissection

8514

Background: The benefits of deep pelvic lymph node dissection (DLND) for node-positive melanoma patients continue to be debated. The objective of our analysis was to assess factors associated with metastatic disease to deep pelvic nodes and examine survival outcomes following DLND. Methods: We retrospectively reviewed the records of 804 patients undergoing lymph node dissection (1990-2001). 97 patients underwent a superficial inguinofemoral lymph node dissection along with a DLND for indications which included: suspicious radiologic imaging (n= 31), documented superficial disease and concern for deep involvement (n = 57), and in-transit disease undergoing limb perfusion (n=9). Logistic regression was performed to identify factors associated with the metastatic tumor spread to deep nodes. Associations between clinicopathologic factors and disease-specific survival (DSS) were estimated using the Cox proportional hazards model. Results: Fifty-four patients (56%) had metastatic disease (median 2 positive lymph nodes, range 1–12) within their deep pelvis. With a median follow-up of 7.5 years, the 5-year DSS was 42% for patients with positive deep pelvic nodes and 52% for those with negative deep pelvic nodes (p = 0.07). When the number of metastatic deep nodes was stratified, the 5-year DSS for patients with 1 positive node, 2–3 positive nodes, and >3 positive nodes was 49%, 48%, and 27%, respectively (p = 0.04). Age ≥ 50 years (odds ratio [OR] = 3.5, p = 0.03), increasing number of positive superficial nodes (OR = 2.1, p < 0.001), and suspicious findings on pelvic CT images (OR = 11.9, p < 0.001) were associated with metastatic deep nodes. In the multivariate analysis, the number of positive deep nodes (hazard ratio [HR] = 1.1, p = 0.03), male gender (HR = 1.9, p = 0.03), and extra-capsular nodal extension of tumor (HR = 2.7, p < 0.001) were identified as adverse prognostic factors for DSS. Conclusions: Survival outcomes in patients with melanoma metastatic to ≤ 3 deep pelvic lymph nodes are comparable to those in patients without deep nodal involvement. These favorable outcomes support an aggressive surgical approach (i.e., DLND) in patients ≥ 50 years, with multiple positive superficial nodes, and suspicious CT findings.

No significant financial relationships to disclose.

Clinical and Immunological responses in patients with malignant melanoma treated with a dendritic cell-based vaccine. Preliminary report from a multi-institutional phase II clinical trial

3004

Background: We have previously reported that vaccination with IDM therapeutic vaccine (IDD-3/Uvidem [Uvidem is co-developed with SANOFI-AVENTIS]) composed of dendritic cells (DC) loaded with three allogeneic lysates from tumor cell lines can elicit immune and anti-tumor responses. We describe here the preliminary results from a phase II clinical trial in metastatic melanoma patients. Methods: DC-MEL-202 is a single arm, two-stage phase II trial designed to evaluate clinical and immunological activities and the safety of a multivalent DC vaccine in patients with in-transit or low volume metastatic melanoma. There was no HLA restriction. Autologous DC were generated, under GMP conditions, from monocytes cultured in GM-CSF and IL-13, loaded with three allogeneic melanoma tumor lysates (M44, SK-MEL 28 and COLO 829) and matured with a combination of bacterial extract (FMKP) and IFN-γ, generating up to 15 doses of the vaccine containing 25x106 DC. Patients received six bi-weekly and two 6-weekly injections (id and sc). Clinical responders were eligible to receive additional doses. Immune response against tumor-associated antigens (TAA) peptides was assessed, at several time points, by detection of IFN-γ producing cells by flow cytometry Results: 33 patients were treated. To date: Vaccination is well tolerated with toxicity limited to mild events (only one possibly related SAE, age-related macular degeneration, was reported). Clinical response (RECIST): 6 patients showed evidence of clinical benefit (1CR, 1PR and 4 SD) with duration of response ranging from 7.5 to 22 months. Assessment of pathological response in target sites in 2 pts (1 PR, 1 SD) showed no residual disease.. 23/33 patients are still alive with a mean follow-up of 11mo (range 3–22mo). Mature data of PFS and OS will be presented. Immune response: 21 (84 %) out of 25 evaluated patients showed detectable TAA-specific CD8+ T cells with ten showing boosted or appearance of anti-TAA specific CD8+ T cells. Conclusions: Vaccination with IDD-3/Uvidem is safe and can elicit tumor specific CD8+ T cells not limited to HLA-A2+ patients. Substantial clinical benefit warrants further development of IDD3.

No significant financial relationships to disclose.

Antioxidant treatment for amyotrophic lateral sclerosis / motor neuron disease

BACKGROUND

Free radical accumulation and oxidative stress have been proposed as contributing to the progression of amyotrophic lateral sclerosis (or motor neuron disease). A range of antioxidant medications are available, and have been studied.

OBJECTIVES

To examine the effects of antioxidant medication in the treatment of people with amyotrophic lateral sclerosis.

SEARCH STRATEGY

We searched the Cochrane Neuromuscular Disease Group Trials register (August 2005), MEDLINE (from January 1966 to August 2005), EMBASE (from January 1980 to August 2005) and other sources.

SELECTION CRITERIA

All randomized or quasi-randomized controlled trials of antioxidant treatment for amyotrophic lateral sclerosis.

DATA COLLECTION AND ANALYSIS

The authors independently applied the selection criteria, assessed study quality and two authors performed independent data extraction.

MAIN RESULTS

The search identified 23 studies for consideration but only nine studies met the inclusion criteria. Only two studies used our predetermined primary outcome measure as the primary outcome measure, (survival at 12 months treatment). However, sufficient data were available from four studies to allow analysis of this outcome measure, and a meta-analysis was performed. In the individual studies no significant effect was observed for vitamin E 500 mg twice daily; vitamin E 1 g five times daily; acetylcysteine 50 mg/kg daily subcutaneous infusion; or a combination of L-methionine 2 g, vitamin E 400 International Units, and selenium 3 x 10-5g three times daily (Alsemet). No significant effect on the primary outcome measure was observed in a meta-analysis of all antioxidants combined. No significant differences were demonstrated in any of the secondary outcome measures.

AUTHORS' CONCLUSIONS

There is insufficient evidence of efficacy of individual antioxidants, or antioxidants in general, in the treatment of people with amyotrophic lateral sclerosis. One study reported a mild positive effect, but this was not supported by the analysis we used. Generally the studies were poorly designed, and underpowered, with low numbers of participants and of short duration. Further well-designed trials of medications such as vitamin C and E are unlikely to be performed. If future trials of antioxidant medications are performed, careful attention should be given to sample size, outcome measures, and duration of the trial. The high tolerance and safety, and relatively low cost of vitamins C and E, and other considerations related to the lack of other effective treatments for amyotrophic lateral sclerosis, explain the continuing use of these vitamins by physicians and people with amyotrophic lateral sclerosis. While there is no substantial clinical trial evidence to support their clinical use, there is no clear contraindication.

A randomized phase III comparative trial of immediate consolidation with high-dose chemotherapy and autologous peripheral blood progenitor cell support compared to observation with delayed consolidation in women with metastatic breast cancer and only bone metastases following intensive induction chemotherapy

The prognosis for patients with metastatic breast cancer remains poor. Metastatic breast cancer confined to the bones may have a better prognosis, especially hormone receptor-positive disease. We performed a prospective, randomized clinical trial to compare immediate consolidation with high-dose chemotherapy and hematopoietic support versus observation with high-dose consolidation at the time of disease progression in women with metastatic breast cancer and only bone metastases. The patients received chemotherapy with doxorubicin, 5-fluorouracil and methotrexate before randomization. In all, 85 patients were enrolled and 69 were randomized. The median follow-up is 8.1 years from randomization. The median event-free survival (EFS) for the immediate transplant arm is 12 months and for the observation arm is 4.3 months (P<0.0001). The median overall survival for the immediate transplant arm is 2.97 years and for the observation arm 1.81 years, a difference that is not statistically significant. Immediate high-dose chemotherapy and radiation therapy as consolidation offers a clinically and statistically significant improvement in EFS compared with radiation therapy alone following induction chemotherapy for women with metastatic breast cancer confined to the bones.

Phase I, pharmacokinetic (PK), pharmacodynamic study of paricalcitol [19-nor-1 alpha, 25-(OH)2 D2] in combination with gemcitabine [2’,2’ difluorodeoxycytidine] in patients with advanced malignancies

12010

Background: Calcitriol+ gemcitabine (gem) combination results in synergistic anti-tumor effect in preclinical models. Cytidine deaminase (CDD) inactivates gem into 2’,2’-difluorodeoxyuridine (dFdU) and its overexpression may lead to gem resistance. Calcitriol decreases CDD activity in peripheral blood mononuclear cells (PBM). Paricalcitol is cytotoxic in vitro and synergistic with several chemotherapeutic agents, including gem. We are conducting a phase I study of paricalcitol + fixed-dose gem. Objectives: The primary aim is to determine maximum tolerated dose (MTD) of the combination in patients (pts) with advanced cancer. Secondary aims are to evaluate toxicity, the effect of paricalcitol on gem PK, CDD activity in PBM and clinical outcome. Methods: Each cycle is 4 weeks: Gem 800 mg/m2 (over 80 min) weekly × 3, starting day 1; paricalcitol weekly, 24 h prior to gem, starting day 7. Standard 3+3 dose-escalation schema is used. Planned paricalcitol doses are 0.24, 0.72, 1.20, 1.8, 2.4 μg/kg, and 25% increments till MTD. Gem PK and CDD activity (PBM) are studied on days 1 and 8. Paricalcitol PK studies are obtained on day 7. Results: Fourteen pts with the following cancers: pancreatic (n=3), colon (n=3), lung (n=5), esophageal (n=1), bladder (n=1) and unknown primary (n=1) have been enrolled. No dose limiting toxicities have occurred. Median of 2 cycles were delivered (range 1–9). Grade 3 toxicities: anemia (n=3 pts), neutropenia (n=5), thrombocytopenia (n=3), thrombosis (n=2), anorexia (n=1), hypophosphatemia (n=1), dehydration (n=1), syncope (n=1), pneumonia (n=1) and chills (n=1). Grade 4 toxicities: anemia (n=1) and neutropenia (n=1). Hypercalcemia (> grade 1) did not occur. Stable disease occurred in 2 and progressive disease in 3. Conclusions: MTD was not reached at 1.8 μg/kg of paricalcitol with gem 800 mg/m2/week. Dose escalation is ongoing. PK data will be presented at meeting. Supported by NIH grants CA67267 and CA85142.

[Table: see text]

Spectrally smooth supercontinuum from 350 nm to 3 mum in sub-centimeter lengths of soft-glass photonic crystal fibers

The conversion of light fields in photonic crystal fibers (PCFs) capitalizes on the dramatic enhancement of several optical nonlinearities. We present here spectrally smooth, highly broadband supercontinuum radiation in a short piece of high-nonlinearity soft-glass PCF. This supercontinuum spans several optical octaves, with a spectral range extending from 350 nm to beyond 3000 nm. The selection of an appropriate propagation-length determines the spectral quality of the supercontinuum generated. Experimentally, we clearly identify two regimes of nonlinear pulse transformation: when the fiber length is much shorter than the dispersion length, soliton propagation is not important and a symmetric supercontinuum spectrum arises from almost pure self-phase modulation. For longer fiber lengths the supercontinuum is formed by the breakup of multiple Raman-shifting solitons. In both regions very broad supercontinuum radiation is produced.

A clinical trial of creatine in ALS

BACKGROUND

Mitochondrial dysfunction occurs early in the course of ALS, and the mitochondria may be an important site for therapeutic intervention. Creatine stabilizes the mitochondrial transition pore, and is important in mitochondrial ATP production. In a transgenic mouse model of ALS, administration of creatine prolongs survival and preserves motor function and motor neurons.

METHODS

The authors conducted a randomized double-blind, placebo controlled trial on 104 patients with ALS from 14 sites to evaluate the efficacy of creatine supplementation in ALS. The primary outcome measure was maximum voluntary isometric contraction of eight upper extremity muscles, with secondary outcomes including grip strength, ALS Functional Rating Scale-Revised, and motor unit number estimates. Patients were treated for 6 months, and evaluated monthly.

RESULTS

Creatine was tolerated well, but no benefit of creatine could be demonstrated in any outcome measure. CI analysis showed that the study, although powered to detect a 50% or greater change in rate of decline of muscle strength, actually made an effect size of greater than 23% unlikely. It was also demonstrated that motor unit number estimation was performed with acceptable reproducibility and tolerability, and may be a useful outcome measure in future clinical trials.

CONCLUSION

Any beneficial effect of creatine at 5 g per day in ALS must be small. Other agents should be considered in future studies of therapeutic agents to address mitochondrial dysfunction in ALS. In addition, motor unit number estimation may be a useful outcome measure for future clinical trials in ALS.

Antioxidant treatment for amyotrophic lateral sclerosis / motor neuron disease

BACKGROUND

Free radical accumulation and oxidative stress have been proposed as contributing to the progression of amyotrophic lateral sclerosis (or motor neuron disease). A range of antioxidant medications are available, and have been studied.

OBJECTIVES

To examine the effects of antioxidant medication in the treatment of people with amyotrophic lateral sclerosis.

SEARCH STRATEGY

We searched the Cochrane Neuromuscular Disease Group trials register (July 2003), MEDLINE (from January 1966 to July 2003), EMBASE (from January 1980 to July 2003) and other sources.

SELECTION CRITERIA

All randomized or quasi-randomized controlled trials of antioxidant treatment for amyotrophic lateral sclerosis.

DATA COLLECTION AND ANALYSIS

The reviewers independently applied the selection criteria, assessed study quality and two reviewers performed independent data extraction.

MAIN RESULTS

The search identified 21 studies for consideration but only eight studies met the inclusion criteria. Only two studies used our predetermined primary outcome measure, (survival at 12 months treatment). Sufficient data were available from three studies to allow analysis of the primary outcome measure, and a meta-analysis was performed. In the individual studies no significant effect was observed of vitamin E 500 mg twice daily; acetylcysteine 50 mg/kg daily subcutaneous infusion; or a combination of L-methionine 2 g, vitamin E 400 International Units, and selenium 3 x 10-5g three times daily (Alsemet). No significant effect on the primary outcome measure was observed in a meta-analysis of antioxidants in general when combining the results. No significant differences were demonstrated in secondary outcome measures.

AUTHORS' CONCLUSIONS

There is insufficient evidence of efficacy of individual antioxidants, or antioxidants in general, in the treatment of people with amyotrophic lateral sclerosis. One study reported a mild positive effect, but this was not supported by the analysis we used. Generally the studies were poorly designed, and underpowered, with low numbers of participants and of short duration. Further well-designed trials of medications such as vitamin C and E are unlikely to be performed. If future trials of antioxidant medications are performed, careful attention should be given to sample size, outcome measures, and duration of the trial. The high tolerance and safety, and relatively low cost of vitamins C and E, and other considerations related to the lack of other effective treatments for amyotrophic lateral sclerosis, explain the continuing use of these vitamins by physicians and patients. While there is no substantial clinical trial evidence to support their clinical use, there is no clear contraindication.

The motivational impact of temporal focus: thinking about the future and the past

In this chapter, we consider the degree to which individuals are pulled to behave by their conceptions of the future, pushed to act by their recollections of the past, or primarily driven by current exigencies. In examining conceptions of the future, we discuss how individuals bridge the present and the future, the origin of goals, their impact on behavior and cognition, and the motivational underpinnings for inferring other people's goals. We then outline four theoretical approaches to goal prioritization, the motivational impact of proximal vs distal goals, and the distinction between approaching positive vs avoiding negative outcomes. Turning to conceptions of the past, we discuss the motivational push of the past, the use of the past to select one's goals, the impact current goals have on recall and interpretations of the past, and individual differences in using the past. We conclude that temporal focus provides a meaningful framework for social cognitive approaches to motivation.