001) Treatment response was not affected by prior HBV treatment

001). Treatment response was not affected by prior HBV treatment. Furthermore, no resistance Lapatinib to tenofovir DF developed through

week 72. Among patients with an alanine aminotransferase (ALT) greater than the upper limit of normal at baseline, normalization of ALT occurred in 74% of patients receiving tenofovir DF and 31% of patients receiving placebo (P < 0.001). The rate of grade 3/4 adverse events was higher among patients treated with placebo (24%) than patients treated with tenofovir DF (10%). No patients met the safety endpoint of a 6% decrease in spine bone mineral density at week 72. The authors concluded that tenofovir DF therapy in HBV-infected adolescents was well tolerated and highly effective at suppressing HBV DNA and normalizing ALT values in both treatment-naïve adolescents and those with prior exposure to HBV therapy. There are several potential limitations of this study. Most of the subjects enrolled in this study were Caucasian patients from Poland and had HBV genotypes A and D. In the

United States, genotypes A and C are most common, so whether these results translate into similar findings in adolescents with genotype selleck chemical C is currently unknown.2 Tenofovir DF has been associated with decreased bone density and osteoporotic fracture risk in human immunodeficiency virus–positive patients.3 Over 72 weeks of therapy, no significant decrease in spine bone mineral density was observed, but whether this observation will persist in adolescents with chronic HBV after a longer period of use of tenofovir DF is not known. ALT, alanine aminotransferase; DF, disoproxil fumarate;

HBV, hepatitis B virus. It is quite gratifying to witness the continued pipeline of pharmaceuticals to combat HBV infection being studied and ultimately receiving approval for use in children and adolescents. It was not that long ago that there were no approved medications selleck products or very few limited drugs to treat HBV. Although universal use of HBV vaccine will ultimately prove to be the single greatest public health measure to combat chronic HBV infection, for those unfortunate children and adolescents afflicted with the disease, medications such as tenofovir DF hold the promise of allowing long and healthy lives. Although this study was limited to adolescents, future study of tenofovir DF in younger children is being initiated.

pylori, particularly in patients with previous eradication failur

pylori, particularly in patients with previous eradication failure.

Our results suggest that testing for susceptibility of H. pylori to quinolones is useful for determining the optimal rescue eradication regimen. “
“Background and Aim: DOC-2/DAB2 interactive protein gene (DAB2IP) is a novel member of the Ras GTPase-activating protein family and plays a tumor suppressive role in cancer progression, but its function in hepatocellular carcinoma (HCC) remains unclear. This aims of this study were to analyze the clinicopathological features of DAB2IP expression in HCC, and to determine the effect of DAB2IP on HCC cell behaviors in vitro. Methods:  The expression of DAB2IP was detected in hepatocyte cell line and HCC cell lines by real-time reverse transcription-polymerase HDAC inhibitor chain reaction and western blot. DAB2IP expression was then examined in 120 cases of clinical paraffin-embedded HCC tissue by immunohistochemistry (IHC). 3-(4,5)-dimethylthiahiazo (-z-y1)-3,5-di- phenytetrazoliumromide (MTT) method and in vitro invasive assay were finally performed to evaluate the effect of DAB2IP depletion on cell proliferation or invasion of HCC cells. Results: DAB2IP expression was lower in

HCC cell Nutlin-3 concentration lines or tissues than in hepatocyte cell lines, adjacent cirrhotic livers or normal livers (P < 0.05). Its expression was positively correlated with tumor size (P = 0.01). Patients with lower DAB2IP expression had shorter overall survival time (P = 0.013). DAB2IP suppresses proliferation and invasion of HCC cells in vitro. Conclusion:  DAB2IP is a valuable marker for progression of HCC patients. Downregulation of DAB2IP is associated with poor prognosis in HCC patients. DAB2IP silence alone is sufficient to promote HCC cell proliferation

and invasion in vitro. “
“Direct measurement of portal learn more pressure (PP) is too invasive to be of clinical use. The most accurate, clinically acceptable measure of PP is by catheterization of the hepatic vein and determination of the intrahepatic wedge pressure gradient, which represents, under certain simple assumptions, the pressure in the portal vein (PV). In this issue, Lisotti et al. propose a pharmacologic approach for measurement of PP. Indocyanine green (ICG) is taken up into hepatocytes and excreted into the bile. They measured ICG blood levels 5, 10, and 15 minutes after injection of a specified amount. They hypothesized that in the case of portal hypertension (PH) and the presence of collaterals, retention of ICG will be higher. They prospectively enrolled 96 consecutive patients with Child A cirrhosis and reported an excellent correlation between the hepatic venous pressure gradient and ICG retention at 15 minutes. Moreover, they identified values for this parameter that are predictive for the presence and absence of esophageal varices.

high), and type of factor concentrate (recombinant vs plasma-der

high), and type of factor concentrate (recombinant vs. plasma-derived), only the type of prophylaxis regimen had a significant effect (P = 0.005). Logistic regression analysis was not performed for the risk of high responder inhibitors due to lack of events in patients given the new regimen. There were however highly significant differences between groups for the prophylaxis-related factors: age at start of prophylaxis and the number of EDs before the introduction of prophylaxis (Table 3). Whereas the new prophylaxis regimen was started after a median of 1 FVIII EDs at a median age of 10.7 months

find more compared to the historical control group were high dose prophylaxis was started later after a median of 30 FVIII on-demand EDs at a median age of 19 months (P < 0.006). Age at start of prophylaxis was available for 23 of the 30 subjects in the standard prophylaxis group and all 26 subjects given the new regimen. The median age at start of prophylaxis was 19 months (range 0.8–87) for those given standard prophylaxis and 10.7 months (range 0.5–24.5) for those given the new regimen. This difference is highly significant (P < 0.0006).

Standard prophylaxis had been introduced after a median of 30 EDs (range 1–infinity) whereas the new regimen was introduced after a median of 1 ED (range 0–14). This difference too is highly significant (P < 0.0001). Fourteen of the 30 subjects given standard prophylaxis and one of the 26 subjects given the new prophylaxis regimen developed an inhibitor. The difference between the groups was highly significant (P = 0.0003, OR 0.048, this website 95% CI: 0.001–0.372) (Table 4). Eight subjects given standard prophylaxis but none of those given the new regimen were high responders. The difference between groups was again significant (P = 0.005, OR for high response 0.00, 95% CI: 0.00–0.57) (Table 4). Inhibitors in the control group developed after a median of 11 EDs check details (range: 3–170 EDs) which is well in agreement with a recent international study [16]. The cumulative inhibitor incidence in the study group on the new prophylaxis regimen was reduced by 95% (OR 0.048) as compared

to the control group on a standard protocol (P = 0.0003, 95% CI: 0.001–0.372) (Fig. 2). As a post-hoc analysis, these results should be interpreted as hypothesis generating. Confirmation in a prospectively planned, historically controlled study would be warranted. It may be considered that the overall risk of developing an inhibitor reflects the level of danger signals perceived by the patient’s immune system. It is not, therefore, surprising that on-demand treatment which is, by definition, given in the presence of bleeding should cause inhibitor development more frequently than prophylaxis. The value of prophylactic factor replacement therapy in the prevention of severe joint bleeds and arthropathy is now well established [17], and is increasingly being adopted as the standard approach to treatment of haemophilia A.

Mineralized tissues such as bone, tooth enamel, and tooth dentin

Mineralized tissues such as bone, tooth enamel, and tooth dentin are more commonly used in historical, archaeological or paleontological studies. These

tissues are composites of mineral, protein, and lipid. The mineral is Epigenetics Compound Library concentration a highly substituted form of hydroxyapatite (Ca10[PO4]6[OH]2) that we will call bioapatite. Bioapatite has a few weight percent carbonate substituting for OH and PO4 and various cations (e.g., Sr, Pb) substituting for Ca. Bone is composed of tiny bioapatite crystals intergrown with an organic matrix (chiefly made of the protein collagen) that is approximately 30% of its dry weight. Enamel is much less porous than bone. It contains <5 weight% organic matter (chiefly noncollagenous proteins) and has much larger crystals with fewer substitutions. The crystal size, organic content, and organic composition of tooth dentin resemble bone, whereas its porosity is intermediate between enamel and bone. These differences in crystal size and porosity lead to large differences in the ability of bioapatite from these tissues to retain isotopic

values during burial and fossilization. In general, only tooth enamel bioapatite is highly retentive and useful for studies of paleontological materials (>10,000-yr-old), whereas bone and dentin are reliable in historical (<500-yr-old) specimens. Samples of intermediate age (10,000–500-yr-old) must be screened carefully. Much more information can be obtained if isotopic analysis Cell Cycle inhibitor can be conducted at the

level of individual organic molecules, rather than bulk tissue (see review by Evershed et al. 2007). Because the different amino or fatty acids in proteins learn more or lipids have different biosynthetic pathways, they provide a finer probe of animal ecology and physiology. At the most basic level, by isolating and analyzing indispensable amino and fatty acids, which must be incorporated from the same compound in diet, we have very direct access to information on dietary sources. For dispensable amino and fatty acids, the extent to which they resemble “bulk” diet versus dietary protein or lipid may provide useful information on animal physiology and perhaps trophic level. This is a rich area that has received little attention in studies of marine mammal ecology, but has been applied to studies of other marine consumers (Popp et al. 2007). An added benefit of the compound-specific approach is that even fossils that have suffered breakdown of biological macromolecules may retain characteristic amino or fatty acids that can provide isotopic information (Fogel and Tuross 2003, Evershed et al. 2007).

One possible explanation for the lack of a strong correlation bet

One possible explanation for the lack of a strong correlation between spinal cord atrophy and clinical disability in this study is that variations in baseline (presymptomatic) spinal cord volumes could obscure such relationships in a cross-sectional study. We predict that a longitudinal study of spinal cord volumes is more likely to demonstrate correlations between atrophy and disability. In summary, spinal cord volume quantification from 3D MR images detects cervical and thoracic spinal cord atrophy in subjects with HAM/TSP and shows promise as a clinically relevant tool in for quantifying the extent of spinal cord involvement Apoptosis inhibitor in HAM/TSP.

Longitudinal studies are needed to adequately assess whether spinal cord volume loss correlates with disability in HAM/TSP and monitoring of disease progression. The learn more 3D MR imaging spinal cord volume quantification technique may be applicable in other progressive neurologic diseases that involve the spinal cord such as primary progressive multiple sclerosis. This study was supported

by the Intramural Research Program of the National Institute of Neurological Disorders and Stroke, National Institutes of Health. “
“Stroke is one of the most feared complications after cardiac catheterization. Endovascular treatment combining mechanical and pharmacological therapy has been reported as an effective treatment option in selected patients with acute stroke due to large-vessel occlusion. Little is known about safety and clinical outcome when this approach is utilized in cardiac

catheterization associated strokes. We analyzed clinical and radiological characteristics and outcomes in the endovascular acute stroke see more treatment databases from two University Hospitals from July 2006 to December 2008 (Cleveland Clinic Foundation) and September 1999 and December 2008 (UPMC Presbyterian hospital), respectively. Of a total of 419 acute stroke interventions, 14 (3.34%) were identified as strokes during or immediately after cardiac catheterization. The mean age was 71 ± 7 years; eight were women (57.1%). Mean National Institute of Health Stroke Scale was 17 (±7.6). Four patients underwent intravenous thrombolysis followed by intraarterial intervention. Median time to treatment was 240 minutes from last time seen normal (range 66-1,365 minutes). Seven patients (50%) had a favorable outcome (modified Rankin Scale [mRS]≤ 2). In-patient mortality was 42%. In acute strokes following cardiac catheterization, multimodal endovascular therapy is safe and feasible and despite a high mortality is associated with a higher than expected rate of favorable outcomes compared to the natural history of the disease. Despite a significant proportion of patients developing symptoms in hospitals where neurointerventions are available, the median time to treatment was longer than expected. Future efforts should focus on faster implementation of recanalization therapies for this form of acute stroke.

Identification of various markers for LPC populations has expedit

Identification of various markers for LPC populations has expedited their characterization and enabled us to examine their differentiation potential in vivo using genetic lineage-tracing approaches. Comprehensive studies regarding selleck chemicals intercellular signaling pathways and their modes of action have succeeded in elucidating novel frameworks for the LPC-niche interaction

functioning in the regenerating liver. Conclusion: Advancing our understanding of the cellular and molecular mechanisms for liver regeneration should provide a basis for developing therapeutic strategies to treat patients with liver disease. (Hepatology 2014;59:1617-1626) “
“Aim:  The gene melting spectral pattern (GMSP) of PCR products from 24 T-cell receptor beta chain variable (TCRBV) gene families was developed to determine sequence bias and feature of TCRBV CDR3 gene family.

Methods:  The assay was based on reverse transcript quantitative polymerase chain reaction and their DNA melting curves. Results:  We discovered that the relatively conserved amino acid sequences X-Q and X-G are present in TCRBV CDR3 from patients with HBV. Further, the X of the X-Q motif is preferentially E (glutamic acid), P (proline) or T (threonine) when accompanied by the BJ2.7, BJ1.5, or BJ2.3, respectively. The frequency of sequence bias in the TCRBV Rapamycin molecular weight gene family showed a positive correlation with the T cell receptor excision circles (TRECs) content, and an inverse correlation with the HBV DNA loading. Conclusion:  These results suggest that the GMSP assay could be used to monitor the features of TCRBV gene distribution quickly, and facilitate the further study of HBV-specific T cell in patients with HBV. “
“The kinetics of hepatitis B surface antigen (HBsAg) levels preceding spontaneous HBsAg seroclearance has not been fully investigated. The kinetics of HBsAg and hepatitis B virus (HBV) DNA of 203 treatment-naïve, hepatitis B e antigen (HBeAg)-negative patients with spontaneous HBsAg seroclearance were compared with 203 age- and sex-matched HBeAg-negative controls. Serum samples at 3 years, 2 years, selleck chemicals llc 1 year, and

6 months before HBsAg seroclearance and at the time of HBsAg loss were tested. Median HBsAg levels at these respective time points before HBsAg seroclearance were 23.5, 3.51, 0.524, and 0.146 IU/mL. For all time points, patients with HBsAg seroclearance had significantly lower median HBsAg and HBV DNA levels, compared to those of the controls (all P < 0.001). Median HBsAg and HBV DNA levels declined significantly until HBsAg seroclearance (P < 0.001). Although median HBsAg levels also decreased significantly with time (P = 0.006) in controls, median HBV DNA levels remained similar (P = 0.414). Serum HBsAg levels, followed by HBsAg log reduction, were the best predictors of HBsAg seroclearance, with an area under the receiving operator characteristic (AUROC) of 0.833 (95% confidence interval [CI]: 0.792-0.873) and 0.803 (95% CI: 0.

pylori infection The addition of LF to the PB did not bring abou

pylori infection. The addition of LF to the PB did not bring about any further improvements in compliance. As compared with the placebo, the eradication this website rate of ST did not improve by adding LF + PB or by using PB alone. “
“Background/Aims:  Recent studies have found that probiotics have anti-Helicobacter pylori (HP) properties. We evaluated the additive effects of (i) Saccharomyces boulardii combined with proton pump inhibitor (PPI)-based triple therapy and (ii) S. boulardii and a mucoprotective agent (DA-9601) coupled with PPI-based triple therapy for HP eradication. Methods:  We recruited 991 HP infected

patients and randomized them into one of three groups, (A) PPI-based 7-day triple therapy, (B) the same triple therapy plus S. boulardii for 4 weeks, and (C) Regorafenib the same 7-day triple therapy plus S. boulardii and mucoprotective agent for 4 weeks. All patients in the three groups were tested via 13C-urea breath test 4 weeks after the completion of the therapy. Results:  According to the results of an intention-to-treat analysis,

HP eradication rates for the groups A, B, and C were 71.6% (237/331), 80.0% (264/330), and 82.1% (271/330), respectively (p = .003). According to the results of a per protocol analysis, the eradication rates were 80.0% (237/296), 85.4% (264/309) and, 84.9% (271/319), respectively (p = .144). The frequency of side effects in group B (48/330) and C (30/330) was lower than that in group A (63/331) (p < .05). Conclusion:  learn more This study suggests that supplementation with S. boulardii could be effective for improving HP eradication rates by reducing side effects thus helping completion of eradication therapy. However, there were no significant effects on HP eradication rates associated with the addition of mucoprotective agents to probiotics and triple therapy. “
“Background:  Ten-day sequential therapy with a proton pump inhibitor (PPI) and amoxicillin followed by a PPI, clarithromycin, and an imidazole typically achieves Helicobacter pylori eradication rates of 90–94% (Grade B success). Aims:  We tested whether prolonging treatment and continuing amoxicillin throughout the 14-day treatment

period would produce a ≥95% result. Methods:  This was a multicenter pilot study in which H. pylori-infected patients received a 14-day sequential–concomitant hybrid therapy (esomeprazole and amoxicillin for 7 days followed by esomeprazole, amoxicillin clarithromycin, and metronidazole for 7 days). H. pylori status was examined 8 weeks after therapy. Success was defined as achieving ≥95% eradication by per-protocol analysis. Results:  One hundred and seventeen subjects received hybrid therapy. The eradication rate was 99.1% (95% confidence interval (CI), 97.3–100.0%) by per-protocol analysis and 97.4% by intention-to-treat analysis (95% CI, 94.5–100.0%). Adverse events were seen in 14.5%; drug compliance was 94.9%. Conclusions:  Fourteen-day hybrid sequential–concomitant therapy achieved >95%H.

pylori infection The addition of LF to the PB did not bring abou

pylori infection. The addition of LF to the PB did not bring about any further improvements in compliance. As compared with the placebo, the eradication MEK inhibitor rate of ST did not improve by adding LF + PB or by using PB alone. “
“Background/Aims:  Recent studies have found that probiotics have anti-Helicobacter pylori (HP) properties. We evaluated the additive effects of (i) Saccharomyces boulardii combined with proton pump inhibitor (PPI)-based triple therapy and (ii) S. boulardii and a mucoprotective agent (DA-9601) coupled with PPI-based triple therapy for HP eradication. Methods:  We recruited 991 HP infected

patients and randomized them into one of three groups, (A) PPI-based 7-day triple therapy, (B) the same triple therapy plus S. boulardii for 4 weeks, and (C) Cell Cycle inhibitor the same 7-day triple therapy plus S. boulardii and mucoprotective agent for 4 weeks. All patients in the three groups were tested via 13C-urea breath test 4 weeks after the completion of the therapy. Results:  According to the results of an intention-to-treat analysis,

HP eradication rates for the groups A, B, and C were 71.6% (237/331), 80.0% (264/330), and 82.1% (271/330), respectively (p = .003). According to the results of a per protocol analysis, the eradication rates were 80.0% (237/296), 85.4% (264/309) and, 84.9% (271/319), respectively (p = .144). The frequency of side effects in group B (48/330) and C (30/330) was lower than that in group A (63/331) (p < .05). Conclusion:  learn more This study suggests that supplementation with S. boulardii could be effective for improving HP eradication rates by reducing side effects thus helping completion of eradication therapy. However, there were no significant effects on HP eradication rates associated with the addition of mucoprotective agents to probiotics and triple therapy. “
“Background:  Ten-day sequential therapy with a proton pump inhibitor (PPI) and amoxicillin followed by a PPI, clarithromycin, and an imidazole typically achieves Helicobacter pylori eradication rates of 90–94% (Grade B success). Aims:  We tested whether prolonging treatment and continuing amoxicillin throughout the 14-day treatment

period would produce a ≥95% result. Methods:  This was a multicenter pilot study in which H. pylori-infected patients received a 14-day sequential–concomitant hybrid therapy (esomeprazole and amoxicillin for 7 days followed by esomeprazole, amoxicillin clarithromycin, and metronidazole for 7 days). H. pylori status was examined 8 weeks after therapy. Success was defined as achieving ≥95% eradication by per-protocol analysis. Results:  One hundred and seventeen subjects received hybrid therapy. The eradication rate was 99.1% (95% confidence interval (CI), 97.3–100.0%) by per-protocol analysis and 97.4% by intention-to-treat analysis (95% CI, 94.5–100.0%). Adverse events were seen in 14.5%; drug compliance was 94.9%. Conclusions:  Fourteen-day hybrid sequential–concomitant therapy achieved >95%H.

pylori infection The addition of LF to the PB did not bring abou

pylori infection. The addition of LF to the PB did not bring about any further improvements in compliance. As compared with the placebo, the eradication http://www.selleckchem.com/products/icg-001.html rate of ST did not improve by adding LF + PB or by using PB alone. “
“Background/Aims:  Recent studies have found that probiotics have anti-Helicobacter pylori (HP) properties. We evaluated the additive effects of (i) Saccharomyces boulardii combined with proton pump inhibitor (PPI)-based triple therapy and (ii) S. boulardii and a mucoprotective agent (DA-9601) coupled with PPI-based triple therapy for HP eradication. Methods:  We recruited 991 HP infected

patients and randomized them into one of three groups, (A) PPI-based 7-day triple therapy, (B) the same triple therapy plus S. boulardii for 4 weeks, and (C) find more the same 7-day triple therapy plus S. boulardii and mucoprotective agent for 4 weeks. All patients in the three groups were tested via 13C-urea breath test 4 weeks after the completion of the therapy. Results:  According to the results of an intention-to-treat analysis,

HP eradication rates for the groups A, B, and C were 71.6% (237/331), 80.0% (264/330), and 82.1% (271/330), respectively (p = .003). According to the results of a per protocol analysis, the eradication rates were 80.0% (237/296), 85.4% (264/309) and, 84.9% (271/319), respectively (p = .144). The frequency of side effects in group B (48/330) and C (30/330) was lower than that in group A (63/331) (p < .05). Conclusion:  see more This study suggests that supplementation with S. boulardii could be effective for improving HP eradication rates by reducing side effects thus helping completion of eradication therapy. However, there were no significant effects on HP eradication rates associated with the addition of mucoprotective agents to probiotics and triple therapy. “
“Background:  Ten-day sequential therapy with a proton pump inhibitor (PPI) and amoxicillin followed by a PPI, clarithromycin, and an imidazole typically achieves Helicobacter pylori eradication rates of 90–94% (Grade B success). Aims:  We tested whether prolonging treatment and continuing amoxicillin throughout the 14-day treatment

period would produce a ≥95% result. Methods:  This was a multicenter pilot study in which H. pylori-infected patients received a 14-day sequential–concomitant hybrid therapy (esomeprazole and amoxicillin for 7 days followed by esomeprazole, amoxicillin clarithromycin, and metronidazole for 7 days). H. pylori status was examined 8 weeks after therapy. Success was defined as achieving ≥95% eradication by per-protocol analysis. Results:  One hundred and seventeen subjects received hybrid therapy. The eradication rate was 99.1% (95% confidence interval (CI), 97.3–100.0%) by per-protocol analysis and 97.4% by intention-to-treat analysis (95% CI, 94.5–100.0%). Adverse events were seen in 14.5%; drug compliance was 94.9%. Conclusions:  Fourteen-day hybrid sequential–concomitant therapy achieved >95%H.

The investigator did

not think this subject was in MOH B

The investigator did

not think this subject was in MOH. Both treatments regiments were well tolerated. There were no serious adverse events in either group. MIDAS scores modestly decreased for both groups. For group A, the decrease was from 28.7 to 22.6, and for group B 27.9 to 24.1. Total number affected by NSAE = 11 of 39 (28%) Number affected by NSAE in Group A = 5 of 19 (26%) Number STA-9090 solubility dmso affected by NSAE in Group B = 6 of 20 (30%) These data suggest that there may be clinically meaningful differences between SumaRT/Nap and naproxen sodium when used frequently for acute treatment in subjects with frequent episodic migraine. Those subjects completing per protocol utilizing naproxen sodium had a significant

decrease in the number of headache days and migraine attacks suggesting a role for naproxen sodium as having both an acute and preventive benefit. Those subjects in the SumaRT/Nap group experienced a more robust pain reduction at ZD1839 2 hours post-dose, but despite having the same dose of naproxen sodium in the product, there was minimal evidence of disease modification. Conversely, there was no indication of increasing migraine frequency with SumaRT/Nap during this study as might be expected with a triptan used alone at this high frequency for treatment of acute migraine. One possible explanation for this difference is that there may be an inhibitory interaction between

sumatriptan and naproxen sodium that prevents the reduction of migraine headache days and attack frequency observed with naproxen sodium alone. Given that sumatriptan is associated with MOH, and animal studies suggest that with frequent exposure to triptans there are neural adaptations leading to triptan-induced latent sensitization of sensory afferents,[14] it is plausible that while the combination of sumatriptan learn more plus naproxen does not reduce migraine headache days, neither is it associated with an increase of migraine headache days. Despite frequent use of both SumaRT/Nap and naproxen, there was no clear evidence of MOH in either study group. Conceivably, naproxen sodium may have a protective benefit when used alone and a beneficial effect when used in combination with sumatriptan in lessening the risk of MOH that might be attributable to sumatriptan when used at this frequency as an acute abortive. This hypothesis clearly requires further study before any definitive statement can be made. Another possible explanation for this observation is that subjects entering the study were actually in unrecognized medication overuse headache due to combinations of acute medications rather than a single medication. That appears unlikely as throughout baseline, only 2 subjects utilized more than 10 doses of a triptan, and only one took more than 15 doses of an NSAID.