Comparing Patient-Reported Outcomes Among Anti-TNF-Experienced Patients with Crohn's Disease Initiating Vedolizumab Versus Ustekinumab.

BACKGROUND: Primary and secondary non-response to anti-tumor necrosis factor (TNF) therapy is common in patients with Crohn's disease (CD), yet limited research has compared the effectiveness of subsequent biological therapy. OBJECTIVE: We sought to compare the effectiveness of vedolizumab and ustekinumab in anti-TNF-experienced patients with CD, focusing on patient-prioritized patient-reported outcomes (PROs). METHODS: We conducted a prospective, internet-based cohort study nested within IBD Partners. We identified anti-TNF-experienced patients initiating with CD vedolizumab or ustekinumab and analyzed PROs reported approximately 6 months later (minimum 4 months, maximum 10 months). Co-primary outcomes were Patient-Reported Outcome Measurement Information System (PROMIS) domains of Fatigue and Pain Interference. Secondary outcomes included patient-reported short Crohn's disease activity index (sCDAI), treatment persistence, and corticosteroid use. Inverse probability of treatment weighting (IPTW) was used to control for a number of potential confounders and incorporated into linear and logistic regression models for continuous and categorical outcomes, respectively. RESULTS: Overall, 141 vedolizumab and 219 ustekinumab initiators were included in our analysis. After adjustment, we found no differences between treatment groups in our primary outcomes of Pain Interference or Fatigue or the secondary outcome of sCDAI. However, vedolizumab was associated with lower treatment persistence (OR 0.4, 95% CI 0.2-0.6) and higher corticosteroid use at follow-up assessment (OR 1.7, 95% CI 1.1-2.6). DISCUSSION: Among anti-TNF experienced patients with CD, Pain Interference or Fatigue was not significantly different 4-10 months after starting ustekinumab or vedolizumab. However, reduced steroid use and increased persistence suggest superiority of ustekinumab for non-PRO outcomes.

Colorectal cancer in women: hormone replacement therapy and chemoprevention.

Colorectal cancer (CRC) accounts for 9.4% of new cancer diagnoses among women world-wide. CRC is the third leading cause of incident cancer among women in the United States and has immense impact on morbidity and mortality. We summarize data on CRC pathogenesis and risk in women. We also review the findings from the Women's Health Initiative (WHI) on CRC risk reduction associated with hormone replacement therapy (HRT) use. We then review observational studies since the WHI which evaluated HRT as a chemopreventive agent for CRC among women. The potential mechanisms behind the association between HRT use and CRC are also reviewed. We then discuss the requirements for implementation of chemopreventive agents, and why HRT should not be used for this indication given current knowledge. Further data on the risk-benefit profile of short-term HRT use are needed and will determine whether there is any future role for HRT use in the chemoprevention of CRC.

Pan-cancer analysis of transcriptional metabolic dysregulation using The Cancer Genome Atlas.

Understanding metabolic dysregulation in different disease settings is vital for the safe and effective incorporation of metabolism-targeted therapeutics in the clinic. Here, using transcriptomic data for 10,704 tumor and normal samples from The Cancer Genome Atlas, across 26 disease sites, we present a novel bioinformatics pipeline that distinguishes tumor from normal tissues, based on differential gene expression for 114 metabolic pathways. We confirm pathway dysregulation in separate patient populations, demonstrating the robustness of our approach. Bootstrapping simulations were then applied to assess the biological significance of these alterations. We provide distinct examples of the types of analysis that can be accomplished with this tool to understand cancer specific metabolic dysregulation, highlighting novel pathways of interest, and patterns of metabolic flux, in both common and rare disease sites. Further, we show that Master Metabolic Transcriptional Regulators explain why metabolic differences exist, can segregate patient populations, and predict responders to different metabolism-targeted therapeutics.

The benefit of combination therapy depends on disease phenotype and duration in Crohn's disease.

BACKGROUND: The impact of combination therapy on disease-related morbidity in patients with established Crohn's disease (CD) or ulcerative colitis (UC) remains to be well-defined. AIM: To examine the effect of combination therapy on disease outcomes in CD and UC. METHODS: Using a multicenter prospective cohort, we classified CD and UC patients as being on monotherapy with anti-TNF or on combination with an immunomodulator. The primary outcome was a composite of new IBD-related surgery, hospitalisations, penetrating complications, need for corticosteroids or new biological at 1 year. Multivariable regression models adjusted for potential confounders. RESULTS: We included 707 patients with CD (45% combination therapy) and 164 with UC (38% combination therapy). Combination therapy was not associated with reduction in the composite outcome in either CD (OR: 0.87, 95% CI: 0.63-1.22) or UC (OR: 1.45, 95% CI: 0.63-3.38). However, while no difference was noted in those with nonstricturing, nonpenetrating CD, a significant reduction in the likelihood of the outcome was seen in those with stricturing or penetrating CD (30% vs 39%, OR: 0.58, 95% CI: 0.37-0.90). A stronger effect was also observed in those with disease duration <5 years (OR: 0.35, 95% CI: 0.14-0.87) compared to those with a longer duration (OR: 0.75, 95% CI: 0.45-1.27). A similar reduction in occurrence of composite outcome was noted with infliximab and with other anti-TNF biologics. CONCLUSION: The benefit of combination immunomodulator-biological therapy is stronger in those with complicated Crohn's disease, particularly early on in their disease course.

Thermoregulation in mice following acute chlordimeform administration.

CBA/J mice were injected intraperitoneally (i.p.) with the formamidine insecticide chlordimeform (CDM) while colonic temperature, preferred ambient temperature (Ta), and lethality were monitored. In the first experiment there was a dose-dependent decrease in colonic temperature when measured 60 min after administering CDM doses of 0, 15, 30, 60, and 75 mg/kg. The hypothermic effect of CDM was more pronounced at a Ta of 20 degrees C than at 30 degrees C. In the second experiment, CDM at doses greater than 30 mg/kg caused a dose-dependent reduction in preferred Ta from the normal value of approx. 30 degrees C to approx. 22 degrees C. Thus, the CDM-treated mouse lowered body temperature by selecting a cool Ta which accelerated the hypothermic effect. In the final experiment, a 90 mg/kg i.p. injection of CDM (the approximate LD50 dose) caused 10% and 0% mortality at a Ta of 20 and 30 degrees C, respectively, and 80% mortality at a Ta of 35 degrees C. It is concluded that the physiological and behavioral response to CDM administration, i.e., selecting a cool Ta and lowering body temperature, may be beneficial to survival.

Identification and synthesis of a methylated catechol metabolite of glutethimide isolated from biological fluids of overdose victims.

Urine samples from victims severely intoxicated by glutethimide were hydrolyzed enzymatically. TLC, GLC, and mass spectral analyses revealed a methylated catechol metabolite of the parent drug. Two synthetic pathways are described for the preparation of 2-ethyl-2-(3-methoxy-4-hydroxyphenyl)glutarimide and 2-ethyl-2-(3-hydroxy-4-methoxyphenyl)glutarimde. Comparisons of GLC and mass spectral data to a compound isolated from the body fluids of glutethimide overdose victims conclusively identified a new 3-methoxy-4-hydroxyphenyl metabolite of glutethimide in humans.

Effect of sodium pentobarbital on behavioral thermoregulation in rats and mice.

In this study on behavioral thermoregulation, male Sprague-Dawley rats were given intraperitoneal (IP) injections of sodium pentobarbital in doses of 0, 1, 5, 10 or 15 mg/kg and male CBA/J mice were given doses of 0, 5, 10, 15 or 30 mg/kg. The animals were immediately placed in a temperature gradient which allowed them to select their preferred ambient temperature (Ta). The preferred Ta of rats increased following an injection of 10 mg/kg sodium pentobarbital, whereas, the barbiturate had no effect on the preferred Ta of mice. In another study, male rats and mice were given sodium pentobarbital in doses of 0, 5, 10 and 15 mg/kg and then placed into a temperature-controlled environmental chamber set at 30 degrees C for mice and 25 degrees C for rats (i.e., their approximate preferred Ta when dosed with sodium pentobarbital). Colonic temperatures were taken one hour after injection. Sodium pentobarbital induced dose dependent hypothermia in rats at 25 degrees C and hyperthermia in mice at 30 degrees C. These data suggest a direct or indirect block of heat gain/conserving effectors in rats treated with sodium pentobarbital which results in hypothermia and an appropriate compensatory selection of a warmer Ta.

Effects of external beam irradiation on the TRAM flap: an experimental model.

The rat model of the transverse rectus abdominis musculocutaneous (TRAM) flap was used in the present study to determine the effects of external beam radiation on myocutaneous flap histology and pathophysiology. A total of 57 adult Sprague-Dawley rats underwent a TRAM procedure. A pilot study with 17 animals was first performed to determine proper radiation dosages, and the remaining 40 rats were then used in the definitive study. In half of the definitive study group, the flaps were subjected to fractionated doses of external beam radiation, whereas the other half served as controls. Six weeks after the last radiation dose, all animals were killed and the flaps were harvested for mechanical assessment and histopathologic evaluation. All TRAM flaps survived in both groups. The irradiated and nonirradiated flaps were minimally distinguishable in viscoelastic properties, as well as by histopathologic examination. Growth of the flap in the irradiated animals was significantly diminished (48 percent average surface area increase in irradiated flaps, versus 92 percent increase in nonirradiated flaps, p < 0.05). These findings suggest that the myocutaneous flap is relatively resistant to some of the known adverse affects of radiation on living tissues.

Temperature regulation in the mouse and hamster exposed to microwaves in hot environments.

Colonic temperature was measured in naive BALB/c mice and golden hamsters immediately following 90-min exposures to 2450-MHz radiofrequency (RF) radiation at an ambient temperature (Ta) of 32.2 or 35 degrees C (dry air). Exposures were performed in a temperature-controlled waveguide which permitted continuous monitoring of the specific absorption rate (SAR) of RF energy. At a Ta of 32.2 degrees C the threshold SAR for elevating colonic temperature and the SAR resulting in a 0.5 degree C elevation in colonic temperature were, respectively, 4.3 and 6.5 W/kg for the mouse and 0.68 and 1.1 W/kg for the hamster. At a Ta of 35 degrees C these values were 0.12 and 0.63 W/kg for the mouse and 0.46 and 0.8 W/kg for the hamster. The SARs required to elevate body temperature in the mouse and hamster at these relatively warm Ta's are considerably lower than those required at cooler Ta's of 20 to 30 degrees C. Overall, the hamster became hyperthermic at lower SARs than the mouse. Ta's of 35 degrees C and greater are frequently encountered during heat waves in the summer months. Under such stressful environmental conditions where heat loss is impaired, absorption of RF radiation at relatively low SARs may lead to significant hyperthermia which would otherwise be readily dissipated at lower Ta's.

Increased risk of herpes zoster among 108 604 patients with inflammatory bowel disease.

BACKGROUND: Patients with inflammatory bowel disease (IBD) on certain immunosuppressants have increased herpes zoster (HZ) risk. AIM: To determine the risk of HZ in IBD and how antitumour necrosis factor-alpha (anti-TNF) agents affect this risk. METHODS: We performed a retrospective cohort and nested case-control study using administrative data from IMS LifeLink(®) Information Assets-Health Plan Claims Database. In the cohort, we identified IBD patients

Ventilatory frequency of mouse and hamster during microwave-induced heat exposure.

Ventilatory frequency was recorded in unrestrained mice and hamsters using microwave radiation. The microwave exposure system was also used to impact varying heat loads to the rodents at ambient temperatures of 10, 20 and 30 degrees C. The absorbed heat load accrued from microwave exposure was measured as the time-averaged rate of energy absorption per unit body weight or specific absorption rate (SAR, W/kg). In both species there was an inverse relationship between ambient temperature (Ta) and threshold SAR to invoke an increase in ventilatory frequency. However, the threshold SAR's for mice were 270 to 450% higher than for hamsters depending on Ta. Above threshold SAR the increase in ventilatory frequency per unit elevation in SAR increased directly with Ta in mice but not with hamsters. On the basis of rate of absorbed energy normalized to body weight (i.e., W/kg), mice can tolerate much more heat from microwave exposure than hamsters. The differences in sensitivity to microwave exposure in the mouse and hamster are probably attributable to species-specific characteristics, and especially differences in body mass and, consequently, passive heat loss.

Temperature regulation in the unrestrained rabbit during exposure to 600 MHz radiofrequency radiation.

Six male New Zealand white rabbits were individually exposed to 600 MHz radiofrequency (RF) radiation for 90 min in a waveguide exposure system at an ambient temperature (Ta) of 20 or 30 degrees C. Immediately after exposure, the rabbit was removed from the exposure chamber and its colonic and ear skin temperatures were quickly measured. The whole-body specific absorption rate (SAR) required to increase colonic and ear skin temperature was determined. At a Ta of 20 degrees C the threshold SAR for elevating colonic and ear skin temperature was 0.64 and 0.26 W/kg, respectively. At a Ta of 30 degrees C the threshold SARs were slightly less than at 20 degrees C, with values of 0.26 W/kg for elevating colonic temperature and 0.19 W/kg for elevating ear skin temperature. The relationship between heat load and elevation in deep body temperature shown in this study at 600 MHz is similar to past studies which employed much higher frequencies of RF radiation (2450-2884 MHz). On the other hand, comparison of these data with studies on exercise-induced heat production and thermoregulation in the rabbit suggest that the relationship between heat gain and elevation in body temperature in exercise and from exposure to RF radiation may differ considerably. When combined with other studies, it was shown that the logarithm of the SAR required for a 1.0 degree C elevation in deep body temperature of the rabbit, rat, hamster, and mouse was inversely related to the logarithm of body mass. The results of this study are consistent with the conclusion that body mass strongly influences thermoregulatory sensitivity of the aforementioned laboratory mammals during exposure to RF radiation.

Relationship between autonomic and behavioral thermoregulation in the golden hamster.

Preferred ambient temperature (Ta) of male golden hamsters (Mesocricetus auratus) was measured repeatedly by placing the animals in a temperature gradient for 80 min. A total of 180 observations were made during the last 20 min of treatment in the gradient. The mean preferred Ta was 28.2 +/- 0.2 degrees C. In another experiment the same animals were placed in a temperature-controlled chamber for 80 min while metabolic rate, evaporative water loss, thermal conductance, and colonic temperature were measured at Ta's of 14-34 degrees C. The lower critical Ta, the Ta below which metabolic rate increased above the resting level, was 28 degrees C. This Ta corresponds closely to the mean preferred Ta of the hamster when placed in the temperature gradient. Evaporative water loss was minimal at Ta's of 14 and 16 degrees C and increased gradually with increasing Ta. Thermal conductance was minimal between Ta's of 14 and 28 degrees C and then increased sharply with increasing Ta. The data from the hamster are qualitatively similar to the mouse in that the preferred Ta corresponds with the lower critical Ta. It appears that, for these rodents, the control of preferred Ta is critically related to the animal's metabolic requirements.

Effect of triethyltin on autonomic and behavioral thermoregulation of mice.

The organotin compound, triethyltin (TET), produces toxic effects in a variety of physiological systems. Thermoregulatory control appears to be especially susceptible to TET toxicity, since TET administration has been shown to cause a pronounced hypothermia in rats. To further elucidate effects of TET on thermoregulation, we measured metabolic rate, evaporative water loss (EWL), body temperature, and preferred ambient temperature (Ta) of mice treated intraperitoneally with TET (bromide salt). At a Ta of 23 to 24 degrees C, TET (6 and 8 mg/kg) inhibited metabolic rate by 23 and 66%, respectively. TET resulted in hypothermia at Ta's of 20 and 30 degrees C but not 35 degrees C. TET had little effect on EWL. Mice given TET at doses of 4, 6, and 8 mg/kg selected a cooler Ta (ca. 25 degrees C) compared to controls (ca. 29 degrees C). Thus, the mice selected a Ta associated with a hypothermic body temperature. At a relatively cool Ta, mice treated with TET had a reduced rate of heat production and, consequently, were hypothermic. At a relatively warm Ta, TET had no effect on heat production and did not increase active heat dissipation (i.e., EWL), thus the mice remained normothermic. The behavioral data indicate that TET evokes a type of regulated hypothermia in mice.

Effect of ambient temperature on the hypometabolic and hypothermic effects of sulfolane in rats.

Sulfolane toxicity may be partially due to its effects on body temperature. To examine the effects of sulfolane on thermoregulation, we measured metabolic rate (oxygen uptake) and body temperature in rats injected intraperitoneally with sulfolane at dosages of 0, 200, 400, and 800 mg/kg. At ambient temperatures (Ta) of 15 and 25 degrees C sulfolane caused a dose-related inhibition of metabolic rate accompanied by hypothermia 60 min post-injection. At a Ta of 35 degrees C, sulfolane had no effect on body temperature or metabolic rate. The hypometabolic and hypothermic effect of sulfolane at a Ta of 25 degrees C at least 2.5 h. Sulfolane had near identical effects on body temperature at TaS of 15 and 25 degrees C, hence, the sulfolane-treated rat had some control over body temperature at a relatively low Ta.

Size transformations of intermediate and low density lipoproteins induced by unesterified fatty acids.

Plasma from individual human subjects is known to contain multiple discrete subpopulations of low (LDL) and intermediate (IDL) density lipoproteins that differ in particle size and density. The metabolic origins of these subpopulations are unknown. Transformation of IDL and larger LDL to smaller, denser LDL particles had been postulated to occur as a result of the combined effects of triglyceride hydrolysis and lipid transfer. However, the presence of multiple small LDL subspecies has been described in patients lacking cholesteryl ester transfer protein. We have characterized an alternative pathway in which size decrements in IDL or LDL are produced in the presence of unesterified fatty acids and a source of apolipoprotein (apo) A-I. Incubation of IDL or LDL subfractions with palmitic acid and either high density lipoproteins (HDL), apoHDL, or purified apoA-I gives rise to apoA-I, apoB-containing complexes that can dissociate into two particles, an apoB-containing lipoprotein with particle diameter 10-30 A smaller than the starting material, and a still smaller species (apparent peak particle diameter 140-190 A) containing lipid and apoA-I but no apoB. The newly formed IDL or LDL are depleted in phospholipid and free cholesterol with no change in apoB-100 as assessed by SDS gel electrophoresis. We hypothesize that this reaction may contribute to the formation of discrete IDL and LDL subpopulations of varying size during the course of hydrolysis of triglyceride-rich lipoproteins in plasma.

Recovery of thrombopoietin during purification.

A thrombocytopoiesis-stimulating factor (TSF or thrombopoietin) was previously purified by a six-step purification procedure. However, the exact quantity of TSF that was recovered, through the various purification procedures, was unknown because of the absence of a method for establishing a unit of measure of TSF. In the present work dose-response relationships on both the crude TSF preparations and on the more highly purified TSF were determined. TSF units were calculated from the dose-response curves. A unit of TSF is defined as the amount of material (mg) that is required to increase the percentages 35S incorporation into platelets of immunothrombocythemic mice by 50% above the baseline. The results of determining the TSF units on the crude TSF preparation indicated that 0.11 unit (U) of TSF/mg protein was present. Results showed that the specific activity of TSF can be increased to about 3.6 U/mg by a single purification procedure using Sephadex G-75 column chromatography. Increased specific activities were obtained by additional purification steps, i.e., DEAE-cellulose column chromatography, SE-HPLC, DEAE-HPLC, and SDS-PAGE. The purified product appears to have a specific activity of about 11,000 U/mg of protein with 0.00003% of the protein and 1.1% of the TSF recovered from the starting material. Establishing a unit of measure for TSF will allow calculations of its degree of purity, provide a method for quantitation of recoveries of activities after various purification procedures, and allow comparisons of results from different experiments and different laboratories.

Sulfolane-induced hypothermia enhances survivability in mice.

Mice injected intraperitoneally with sulfolane (tetrahydrothiophene-1,1-dioxide) underwent a significant decrease in metabolic rate and body temperature at ambient temperatures of 20 and 30 degrees C but not 35 degrees C. If given the opportunity, mice treated with sulfolane preferentially sought a cool ambient temperature. When given an LD50 dose of sulfolane (1270 mg/kg), the percentage mortality varied directly with ambient temperature. For example, at 35 degrees C mortality was 75% whereas at 25 degrees C mortality was only 8%. By undergoing an autonomically and behaviorally mediated decrease in body temperature (i.e., regulated hypothermia), sulfolane-treated mice appear to enhance their chance of survival.

Measurement of blood-brain barrier permeation in rats during exposure to 2450-MHz microwaves.

Adult rats anesthesized with pentobarbital and injected intravenously with a mixture of [14C] sucrose and [3H] insulin were exposed for 30 min to an environment at an ambient temperature of 22, 30, or 40 degrees C, or were exposed at 22 degrees C to 2450-MHz CW microwave radiation at power densities of 0, 10, 20, or 30 mW/cm2. Following exposure, the brain was perfused and sectioned into eight regions, and the radioactivity in each region was counted. The data were analyzed by two methods. First, the data for each of the eight regions and for each of the two radioactive tracers were analyzed by regression analysis for a total of 16 analyses and Bonferroni's Inequality was applied to prevent false positive results from numerous analyses. By this conservative test, no statistically significant increase in permeation was found for either tracer in any brain region of rats exposed to microwaves. Second, a profile analysis was used for a general change in tracer uptake across all brain regions. Using this statistical method, a significant increase in permeation was found for sucrose but not for inulin. A correction factor was then derived from the warm-air experiments to correct for the increase in permeation of the brain associated with change in body temperature. This correction factor was applied to the data for the irradiated animals. After correcting the data for thermal effects of the microwave radiation, no significant increase in permeation was found.