Alternative formulations have been proposed to overcome these drawbacks. The objective of this study was
to evaluate process-related variables like hydration and sonication time, rotation speed of evaporation flask, and the effects of charge-inducing agent and centrifugation on zidovudine entrapment and release from niosomes. Formulation of zidovudine niosomes was optimized by altering the proportions of Tween, Z-IETD-FMK supplier Span and cholesterol. The effect of process-related variables like hydration time, sonication time, charge-inducing agent, centrifugation and rotational speed of evaporation flask on zidovudine entrapment and release from niosomes was evaluated. The effect of changes in osmotic shock and viscosity were also evaluated. Non-sonicated niosomes were in the size range of 2-3.5 mu m and sonicated
niosomes formulated with Tween 80 and dicetylphosphate (DCP) had a mean diameter of 801 nm. Zidovudine niosomes formulated with Tween 80 entrapped high amounts of drug and the addition of DCP enhanced drug release for a longer time (88.72% over 12 h). The mechanism of release from Tween 80 formulation was the Fickian type and obeyed first-order release kinetics. Niosomes can be formulated by proper adjustment of process parameters to enhance zidovudine entrapment and sustainability of release. These improvements in zidovudine selleck screening library formulation may be useful in developing a more effective AIDS therapy.”
“Study Design. Multicenter ambispective cohort analysis.
purpose of this study is to determine whether applying Enneking’s principles to surgical management of primary bone tumors of the spine significanti find more decreases local recurrence and/or mortality.
Summary of Background Data. Oncologic management of primary tumors of spine has historically been inconsistent, controversial, and open to individual interpretation.
Methods. A multicenter ambispective cohort analysis from 4 tertiary care spine referral centers was done. Patients were analyzed in 2 cohorts, “”Enneking Appropriate”" (EA), surgical margin as recommended by Enneking, and “”Enneking Inappropriate”" (EI), surgical margin not recommended by Enneking. Benign tumors were not included in mortality analysis.
Results. Two cohorts represented an analytic dataset with 147 patients, 86 male, average age 46 years (range: 10-83). Median follow-up was 4 (2-7) years in the EA and 6 (5.5-15.5) years in the EI. Seventy-one patients suffered at least 1 local recurrence during the study, 57 of 77 in the EI group and 14 of 70 in the EA group. EI surgical approach caused higher risk of first local recurrence (P < 0.0001). There were 48 deaths in total; 29 in the EI group and 19 in the EA. There was a strong correlation between the first local recurrence and mortality with an odds ratio of 4.69, (P < 0.0001). EI surgical approach resulted in a higher risk of mortality with a hazard ratio of 3.10, (P = 0.0485) compared to EA approach.