Double-blind randomized trials of single-tablet ibuprofen/high-dose famotidine vs. ibuprofen alone for reduction of gastric and duodenal ulcers.

OBJECTIVES: We performed two 24-week double-blind trials (REDUCE-1 and -2 (Registration Endoscopic Studies to Determine Ulcer Formation of HZT-501 Compared with Ibuprofen: Efficacy and Safety Studies)) to assess whether double-dose famotidine given in a single-tablet combination with ibuprofen (HZT-501) significantly reduces gastric and duodenal ulcers as compared with ibuprofen. METHODS: Patients (40-80 years) requiring daily non-steroidal anti-inflammatory drugs (NSAIDs) for ≥6 months with no prior ulcer complications, negative H. pylori stool test, and baseline endoscopy showing no ulcers and <5 erosions were randomly assigned in a 2:1 ratio to HZT-501 or identical-appearing ibuprofen 800 mg tablets thrice daily. Study endoscopies were done at 8, 16, and 24 weeks. After unblinding and initial analyses, 12 patients were found to be misclassified as having gastric ulcers based on the adjudication of endoscopy reports, and analyses were re-run. RESULTS: In REDUCE-1, the primary end point analysis of gastric ulcers at 24 weeks with HZT-501 vs. ibuprofen was 12.7% vs. 22.9% (P=0.0044) in the post-adjudication analysis. In REDUCE-2, the primary end point analysis of upper gastrointestinal (GI) ulcers was 13.0% vs. 20.5% (P=0.0587) in the post-adjudication analysis. Prespecified pooled analyses showed significantly fewer gastric (12.5% vs. 20.7%) and duodenal ulcers (1.1% vs. 5.1%) with HZT-501 vs. ibuprofen. Proportional hazards analysis of multiple potential risk factors showed the risk ratio of upper GI ulcers with HZT-501 vs. ibuprofen was 0.46, 95% confidence interval was 0.34-0.61. CONCLUSIONS: Combined results of the REDUCE studies indicate that double-dose famotidine plus ibuprofen, given as a combination tablet, decreases endoscopic upper GI ulcers as compared with ibuprofen alone.

Non-PEGylated liposomes for convection-enhanced delivery of topotecan and gadodiamide in malignant glioma: initial experience.

Convection-enhanced delivery (CED) of highly stable PEGylated liposomes encapsulating chemotherapeutic drugs has previously been effective against malignant glioma xenografts. We have developed a novel, convectable non-PEGylated liposomal formulation that can be used to encapsulate both the topoisomerase I inhibitor topotecan (topoCED) and paramagnetic gadodiamide (gadoCED), providing an ideal basis for real-time monitoring of drug distribution. Tissue retention of topoCED following single CED administration was significantly improved relative to free topotecan. At a dose of 10 microg (0.5 mg/ml), topoCED had a half-life in brain of approximately 1 day and increased the area under the concentration-time curve (AUC) by 28-fold over free topotecan (153.8 vs. 5.5 microg day/g). The combination of topoCED and gadoCED was found to co-convect well in both naïve rat brain and malignant glioma xenografts (correlation coefficients 0.97-0.99). In a U87MG cell assay, the 50% inhibitory concentration (IC(50)) of topoCED was approximately 0.8 microM at 48 and 72 h; its concentration-time curves were similar to free topotecan and unaffected by gadoCED. In a U87MG intracranial rat xenograft model, a two-dose CED regimen of topoCED co-infused with gadoCED greatly increased median overall survival at dose levels of 0.5 mg/ml (29.5 days) and 1.0 mg/ml (33.0 days) vs. control (20.0 days; P < 0.0001 for both comparisons). TopoCED at higher concentrations (1.6 mg/ml) co-infused with gadoCED showed no evidence of histopathological changes attributable to either agent. The positive results of tissue pharmacokinetics, co-convection, cytotoxicity, efficacy, and lack of toxicity of topoCED in a clinically meaningful dose range, combined with an ideal matched-liposome paramagnetic agent, gadoCED, implicates further clinical applications of this therapy in the treatment of malignant glioma.

Pharmacokinetic/pharmacodynamic modeling and simulation of neutropenia during phase I development of liposome-entrapped paclitaxel.

PURPOSE: To evaluate the maximum tolerated dose (MTD), dose-limiting toxicities (DLT), and pharmacokinetics of liposome-entrapped paclitaxel easy-to-use (LEP-ETU) and to characterize the relationship between LEP-ETU concentrations and the time course of neutropenia in cancer patients. EXPERIMENTAL DESIGN: LEP-ETU was administered to 88 patients and 63 were evaluable for pharmacokinetic/pharmacodynamic (PK/PD) analysis following 1.5- and 3-h infusions every 3 weeks (q3w; dose range, 135-375 mg/m(2)). MTD was identified using a 3 + 3, up-and-down dose-finding algorithm. PK/PD modeling was done to describe the temporal relationship between paclitaxel concentrations and neutrophil count. Simulations assessed the influence of dose and schedule on neutropenia severity to help guide dose selection. RESULTS: The MTD of LEP-ETU was identified as 325 mg/m(2). DLTs occurring at 375 mg/m(2) consisted of febrile neutropenia and neuropathy. The C(max) and area under the plasma concentration-time curve of LEP-ETU were less than proportional with increasing dose. The PK/PD model showed that LEP-ETU inhibition of neutrophil proliferation was 9.1% per 10 mug/mL of total paclitaxel concentration. The incidence of grade 4 neutropenia increased from 33% to 42% across the dose range of 275 to 325 mg/m(2) q3w. For a dose of 110 mg/m(2) given weekly, grade 4 neutropenia was estimated to be 16% compared with 42% for the same total dose administered q3w. CONCLUSIONS: LEP-ETU can be administered safely at higher doses than Taxol. Modeling and simulation studies predict that 325 mg/m(2) LEP-ETU q3w provides acceptable neutropenic events relative to those observed at 175 mg/m(2) Taxol q3w. A 275 mg/m(2) dose may offer an improved therapeutic index.

Randomized, double-blind, placebo-controlled study of interferon-γ 1b in Friedreich Ataxia.

Objective: In vitro, in vivo, and open-label studies suggest that interferon gamma (IFN-γ 1b) may improve clinical features in Friedreich Ataxia through an increase in frataxin levels. The present study evaluates the efficacy and safety of IFN-γ 1b in the treatment of Friedreich Ataxia through a double-blind, multicenter, placebo-controlled trial. Methods: Ninety-two subjects with FRDA between 10 and 25 years of age were enrolled. Subjects received either IFN-γ 1b or placebo for 6 months. The primary outcome measure was the modified Friedreich Ataxia Rating Scale (mFARS). Results: No difference was noted between the groups after 6 months of treatment in the mFARS or secondary outcome measures. No change was noted in buccal cell or whole blood frataxin levels. However, during an open-label extension period, subjects had a more stable course than expected based on natural history data. Conclusions: This study provides no direct evidence for a beneficial effect of IFN-γ1b in FRDA. The modest stabilization compared to natural history data leaves open the possibility that longer studies may demonstrate benefit.

Safety of intraparenchymal convection-enhanced delivery of cintredekin besudotox in early-phase studies.

OBJECT: Convection-enhanced delivery (CED) is an increasingly used novel local/regional delivery method targeted directly to tissue. It relies on a continuous pressure gradient for distribution of therapeutic agents into the interstitial space, with administration of the infusate over a few days. Cintredekin besudotox (also known as IL13- PE38QQR) is a recombinant chimeric cytotoxin consisting of interleukin-13 and a truncated exotoxin produced by the Pseudomonas aeruginosa bacterium, which targets malignant glioma cells. METHODS: Cintredekin besudotox was administered via intraparenchymal CED after resection of supratentorial recurrent malignant glioma. The safety and toxicity profile was reviewed for 53 patients in whom infusion catheters had been placed; 51 of them received CED of the study drug. Adverse events were categorized based on time of onset in relation to CED, and the causal relationship with catheter placement or delivery of cintredekin besudotox. Catheters were placed in 53 patients, although only 51 of them received cintredekin besudotox. Most adverse events related to catheter placement or the study drug originated from the central nervous system. Three symptomatic windows were defined: the first one was between surgical procedure and CED; the second was during CED and up to 1 week after its completion; and the third window was 2 to 10 weeks after treatment. Those windows generally reflected adverse events related to surgical procedures, mass effect from infusate, and drug effect on tumor-infiltrated and normal brain parenchyma, respectively. CONCLUSIONS: The symptomatic windows identified in this study apply to any CED clinical trials, particularly those in which chimeric cytotoxins are used, and will help to determine the most likely underlying pathophysiological process causing symptoms. This information, in turn, will help to prevent adverse events or minimize their severity. Those events also have implications for dose escalation and outcome measures.

Delayed-release prednisone improves fatigue and health-related quality of life: findings from the CAPRA-2 double-blind randomised study in rheumatoid arthritis.

OBJECTIVES: Like morning stiffness, fatigue is a common, debilitating symptom of rheumatoid arthritis (RA). Delayed-release (DR) prednisone is designed for evening administration (approximately 22:00) and releases 4 h later to coincide with the rise of nocturnal inflammatory cytokines associated with development of morning stiffness. The impact of DR prednisone on fatigue and other related patient-reported outcomes was analysed with data obtained from the Circadian Administration of Prednisone in Rheumatoid Arthritis (CAPRA) 2 study. METHODS: Patients with symptomatic RA (n=350) despite treatment with a disease-modifying antirheumatic drug (DMARD) were randomised 2:1 to receive additional therapy with DR prednisone 5 mg or placebo once daily for 12 weeks. Fatigue was assessed using validated instruments: the fatigue scale of the Functional Assessment of Chronic Illness Therapy-Fatigue (FACIT-F) and the vitality domain of the Short Form-36 (SF-36). General quality of life was assessed using the general score and individual domains of Functional Assessment of Cancer Therapy-General (FACT-G) and SF-36. RESULTS: The change from baseline to week 12 in FACIT-F score was statistically significantly different with DR prednisone/DMARD (3.8) versus placebo/DMARD (1.6; difference 2.2, p=0.0032). Improvement in FACIT-F score correlated positively with clinical response. Compared with placebo/DMARD, DR prednisone/DMARD showed a significantly greater improvement in SF-36 vitality score (5.6, p=0.001), physical component of SF-36 (2.3, p=0.0003) and general score with FACT-G (2.6, p=0.0233). CONCLUSIONS: DR prednisone in addition to a DMARD significantly improves fatigue and other aspects of health-related quality of life in patients with symptomatic RA compared with DMARD treatment alone. TRIAL REGISTRATION NUMBER: ClinicalTrials.gov NCT00650078.

Onset and durability of pain relief in knee osteoarthritis: Pooled results from two placebo trials of naproxen/esomeprazole combination and celecoxib.

OBJECTIVE: To further characterize time-to-first pain relief, effect size, correlations between various outcome measures and durability of relief for single-tablet naproxen 500 mg/esomeprazole 20 mg (NAP/ESO) given twice daily and celecoxib (CEL) (200 mg) given once daily versus placebo in knee osteoarthritis (OA). METHODS: Unpublished data from two double-blind, double-dummy, placebo-controlled trials in which patients aged ≥ 50 years with knee OA were randomized to NAP/ESO (n = 487), CEL (n = 486) or placebo (n = 246) were pooled (NCT00664560 and NCT00665431). Acute response endpoints: 1) Time to first significant pain response, 2) Western Ontario and McMaster Osteoarthritis Index (WOMAC) pain subscale and 3) American Pain Society Patient Outcome Questionnaire (APS-POQ) scores. Sustainability endpoints: 1) Routine Assessment of Patient Index Data (RAPID3) and 2) WOMAC Stiffness, Pain and Total scores; and Patient Global Assessment (PGA) at 6 and 12 weeks. Effect sizes for all measures were calculated. Rescue pain medication use also was analyzed, as was the correlation of WOMAC to RAPID3. RESULTS: NAP/ESO produced statistically significant decreases in WOMAC Pain on Days 2-7 and at Weeks 6 and 12 (all p < 0.05); most APS-POQ pain assessments with NAP/ESO were significantly improved on Days 2-7 compared with placebo (all p < 0.05). A good or excellent response occurred in a median of 6 days. RAPID3 and WOMAC total/stiffness/function/PGA scores decreased significantly at Weeks 6 and 12 (all p < 0.05). Placebo-adjusted WOMAC pain effect sizes were 0.44, 0.34 and 0.25 at Day 7, week 6 and week 12, respectively. RAPID3 to WOMAC total and WOMAC pain to RAPID3: Pain scores were highly correlated at 6 and 12 weeks (correlation coefficients >0.80). No significant differences in overall responses were found between CEL and NAP/ESO. CONCLUSION: Naproxen/esomeprazole produced a significant absolute moderate early pain response, which was maintained for 12 weeks. RAPID3 was found to be highly correlated with the typical OA measure (WOMAC) and might be a useful clinical tool for measuring NSAID response. NCT00664560: https://clinicaltrials.gov/ct2/show/NCT00664560, NCT00665431: https://www.clinicaltrials.gov/ct2/show/NCT00665431.

Onset and durability of pain relief in knee osteoarthritis: pooled results from two placebo trials of naproxen/esomeprazole combination and celecoxib.

OBJECTIVE: To further characterize time-to-first pain relief, effect size, correlations between various outcome measures and durability of relief for single-tablet naproxen 500 mg/esomeprazole 20 mg (NAP/ESO) given twice daily and celecoxib (CEL) (200 mg) given once daily versus placebo in knee osteoarthritis (OA). METHODS: Unpublished data from two double-blind, double-dummy, placebo-controlled trials in which patients aged ≥50 years with knee OA were randomized to NAP/ESO (n = 487), CEL (n = 486) or placebo (n = 246) were pooled (NCT00664560 and NCT00665431). Acute response endpoints: 1) Time to first significant pain response, 2) Western Ontario and McMaster Osteoarthritis Index (WOMAC) pain subscale and 3) American Pain Society Patient Outcome Questionnaire (APS-POQ) scores. Sustainability endpoints: 1) Routine Assessment of Patient Index Data (RAPID3) and 2) WOMAC Stiffness, Pain and Total scores; and Patient Global Assessment (PGA) at 6 and 12 weeks. Effect sizes for all measures were calculated. Rescue pain medication use also was analyzed, as was the correlation of WOMAC to RAPID3. RESULTS: NAP/ESO produced statistically significant decreases in WOMAC Pain on Days 2-7 and at Weeks 6 and 12 (all p < 0.05); most APS-POQ pain assessments with NAP/ESO were significantly improved on Days 2-7 compared with placebo (all p < 0.05). A good or excellent response occurred in a median of 6 days. RAPID3 and WOMAC total/stiffness/function/PGA scores decreased significantly at Weeks 6 and 12 (all p < 0.05). Placebo-adjusted WOMAC pain effect sizes were 0.44, 0.34 and 0.25 at Day 7, week 6 and week 12, respectively. RAPID3 to WOMAC total and WOMAC pain to RAPID3: Pain scores were highly correlated at 6 and 12 weeks (correlation coefficients >0.80). No significant differences in overall responses were found between CEL and NAP/ESO. CONCLUSION: Naproxen/esomeprazole produced a significant absolute moderate early pain response, which was maintained for 12 weeks. RAPID3 was found to be highly correlated with the typical OA measure (WOMAC) and might be a useful clinical tool for measuring NSAID response. NCT00664560: https://clinicaltrials.gov/ct2/show/NCT00664560, NCT00665431: https://www.clinicaltrials.gov/ct2/show/NCT00665431.

One-year safety of ibuprofen/famotidine fixed combination versus ibuprofen alone: pooled analyses of two 24-week randomized, double-blind trials and a follow-on extension.

OBJECTIVE: To evaluate the safety of the fixed combination of ibuprofen and famotidine compared with ibuprofen alone from two 24-week, multicenter, double-blind trials designed to evaluate the comparative incidence of endoscopically documented upper gastrointestinal ulcers and a 28-week double-blind extension study. RESEARCH DESIGN AND METHODS: Safety was analyzed by pooling data from the two double-blind trials and the follow-on study. Safety was assessed by monitoring the incidence, causality, and severity of adverse events (AEs). RESULTS: In the pivotal efficacy and safety trials, discontinuation rates due to any cause and dyspepsia were significantly lower for the ibuprofen/famotidine combination versus ibuprofen alone. Other than dyspepsia, gastrointestinal and cardiovascular AEs of special interest were similar. Events judged to be treatment related were significantly lower with the ibuprofen/famotidine combination (20.6% vs. 25%). In the safety extension population, there were no differences in the discontinuation rates and the reporting of AEs or serious AEs (SAEs) between the two groups. Gastrointestinal-related events were similar between the groups. Incidence of cardiovascular-related AEs of special interest were 11% (ibuprofen/famotidine) and 2% (ibuprofen) (p=0.06), possibly due to a higher number of rheumatoid arthritis patients in the combination group. Of these, 80% were reports of hypertension (8% ibuprofen/famotidine vs. 2% ibuprofen). Three cases of hypertension in the ibuprofen/famotidine group were considered treatment related. The probability of a cardiovascular event decreased during days 112-167 of treatment and remained low with continued treatment. CONCLUSIONS: One-year safety data from two pivotal trials and a long-term extension study indicate that the ibuprofen/famotidine combination demonstrates a favorable gastrointestinal safety profile and more patients continued on therapy compared to ibuprofen alone. No new safety signals have been identified. These data offer additional evidence supporting a new therapeutic option to improve gastrointestinal safety and adherence for patients who require long-term ibuprofen.

One-year open-label safety evaluation of the fixed combination of ibuprofen and famotidine with a prospective analysis of dyspepsia.

OBJECTIVE: To assess the long-term safety of the single-tablet combination of ibuprofen 800 mg and famotidine 26.6 mg. RESEARCH DESIGN AND METHODS: A phase 3b open-label study (NCT00984815) was conducted in 86 adults requiring daily non-steroidal anti-inflammatory drug (NSAID) administration for ≥12 months. The combination tablet of ibuprofen/famotidine was self-administered orally three times daily for up to 54 consecutive weeks. Adverse events (AEs) were collected beginning at the first dose and continued through completion (54 weeks). The Severity of Dyspepsia Assessment (SODA) questionnaire was completed by patients to assess tolerability. RESULTS: Most patients (65%) finished the trial, with 76% contributing data at 6 months, and 21% withdrew due to adverse effects. Overall and gastrointestinal AE discontinuation rates (21% and 13%, respectively) were lower than that previously reported with ibuprofen 2400 mg given alone. Each of the SODA subscale scores demonstrated improvement by week 6 and improved statistically significantly at week 24 and week 54. Of the cardiovascular AEs, hypertension was reported most frequently (9/86, 9.3%), with 3.5% determined to be drug related. Twelve serious AEs were reported by 9 of 86 (10%) patients; two were considered possibly related to the study medication (unstable angina and gastric ulcer). There were no reports of serious gastrointestinal or CV complications. Most AEs were mild or moderate in severity and not considered drug related. CONCLUSIONS: These data, together with previously reported findings of a significant decrease in upper gastrointestinal endoscopic ulcer rate at 6 months, support the overall safety, compliance, and tolerability of this single-tablet formulation.

Improvement Thresholds for Morning Stiffness Duration in Patients Receiving Delayed- Versus Immediate-Release Prednisone for Rheumatoid Arthritis.

BACKGROUND: Morning stiffness, a common patient reported symptom in rheumatoid arthritis, is associated with an increase in early morning inflammatory cytokines and significant disability. Little is known about categorical morning stiffness responses to glucocorticoid use in rheumatoid arthritis patients. Chronic pain threshold models have indicated previously that response rates of 15% to 30% indicate minimally important relief, 40% to 50% indicate substantial pain relief, and greater than 70% represents extensive pain relief. The objective of the present analysis was to assess differences in the percentages of patients achieving 25%(minimally important change), 50% (substantial change), and 75% (extensive change) reduction in the duration of patient-reported morning stiffness between patients receiving DR- and IR-prednisone in the Circadian Administration of Prednisone in Rheumatoid Arthritis (CAPRA-1) trial. MATERIALS AND METHODS: The CAPRA-1 trial was a 12-week, double-blind study followed by an additional 9-month open-label extension. Patients in the CAPRA-1 trial were randomized to IR-prednisone in the morning or DR-prednisone at bedtime in addition to stable disease modifying antirheumatic drug therapy. After the double-blind phase, patients randomized to IR-prednisone (N =110) were switched to DR-prednisone and followed at 3, 6, and 9 months in an open-label extension phase. Patients originally randomized to DR-prednisone (N = 97) continued that therapy in the open-label extension. Patient morning stiffness diary entries from 4 weeks before and 4 weeks after each scheduled visit were analyzed over 1 year for threshold response. The number of patients reaching threshold response (25%, 50%, and 75% improvement) and time to morning stiffness response were examined. RESULTS: The DR-prednisone arm had significantly more responders in all three morning stiffness threshold response categories at the end of the double-blind period compared with IR-prednisone (p ≤ 0.05). Patients who switched from IR- to DR-prednisone in the open-label extension had comparable responses in all categories within 3 months and significantly shorter time to response versus patients already receiving DR-prednisone. DISCUSSION: DR-prednisone produced significantly higher morning stiffness response rates compared with IR prednisone, as defined by 25%, 50%, and 75% improvement thresholds, at week 12. The time to reach these thresholds was quicker with DR-prednisone, and patients who switched to DR-prednisone from IR-prednisone achieved responses comparable to the continuous DR-prednisone group over 9 months of therapy. This analysis is the first to assess time-to-event and percentage threshold morning stiffness responses to differently timed glucocorticoid therapy and propose clinically meaningful response rates in RA patients.

Risk of upper gastrointestinal ulcers in patients with osteoarthritis receiving single-tablet ibuprofen/famotidine versus ibuprofen alone: pooled efficacy and safety analyses of two randomized, double-blind, comparison trials.

BACKGROUND: Although anti-inflammatory doses of ibuprofen are very effective in treating the signs and symptoms of osteoarthritis (OA), they come with an increased risk for gastrointestinal damage which can limit their use and decrease patient adherence to therapy. OBJECTIVE: Assess the efficacy and safety of an ibuprofen/famotidine fixed-dose tablet for reducing the risk of upper gastrointestinal (UGI) ulcers compared with ibuprofen alone in OA patients. METHODS: Osteoarthritis patients from previously completed randomized, double-blind, comparison registration trials (REDUCE-1 and 2) which included a broad pain patient population, were pooled and analyzed for (1) the risk of endoscopically identified UGI ulcers over 24 weeks and (2) comparative pre-specified treatment emergent adverse events (TEAEs). The primary outcomes were the comparative incidence of UGI, gastric, and duodenal ulcers and TEAEs in (1) the total OA population, (2) those aged ≥ 60 years, and (3) those on low dose aspirin. A total of 776 patients were randomized (safety population), and 713 were evaluable as the study population. RESULTS: Upper gastrointestinal ulcer risk was statistically significantly reduced with the fixed dose tablet compared with ibuprofen alone by 44% in the overall population, 55% in those aged ≥ 60 years and 65% in those on low dose aspirin. Individually, gastric and duodenal ulcers were also significantly reduced in all groups analyzed. Adverse events of special interest were generally similar between the 2 groups, with the exception of dyspepsia. Relative risk reduction for dyspepsia in the overall population was 40% and 55% in those aged ≥ 60 years. Patients not receiving low dose aspirin had a 49% relative risk reduction in dyspepsia. CONCLUSION: The fixed combination of ibuprofen/famotidine significantly reduced the risk for endoscopically documented gastrointestinal ulcers in OA patients and produced clinically meaningful reductions in patient reported dyspepsia compared with the ibuprofen alone.

Pharmacodynamic evaluation of intragastric pH and implications for famotidine dosing in the prophylaxis of non-steroidal anti-inflammatory drug induced gastropathy-a proof of concept analysis.

OBJECTIVE: Famotidine given at a dose of 80 mg/day is effective in preventing NSAID-induced gastropathy. The aim of this proof of concept study was to compare twice a day (BID) vs 3-times a day (TID) administration of this total dose of famotidine on intragastric pH in healthy volunteers. RESEARCH DESIGN AND METHODS: Two analyses were undertaken: (1) a 13 subject controlled cross-over 24-h intragastric pH evaluation of the BID and TID administration of 80 mg/day of famotidine, as well as measures for drug accumulation over 5 days (EudraCT, number 2006-002930-39); and (2) a pharmacokinetic (PK)/pharmacodynamic (PD) model which predicted steady-state famotidine plasma concentrations and pH of the two regimens. RESULTS: For the cross-over study, gastric pH was above 3.5 for a mean of 20 min longer for TID dosing compared to BID dosing on Day 1. On Day 5, the mean time above this threshold was higher with the BID regimen by ∼25 min. For pH 4, subjects' gastric pH was above this pH value for a mean of 25 min longer for TID dosing compared to BID dosing on Day 1. For Day 5, the pH was above 4 for ∼45 min longer with the TID regimen as compared with the BID regimen. The mean 24-h gastric pH values when taken in the upright position trended higher for the TID dosing period compared to the BID regimen on Day 1. The steady-state simulation model indicated that, following TID dosing, intragastric pH will be above 3 for 24 h vs 16 h for the BID regimen. There was no evidence for plasma accumulation of famotidine with TID dosing as compared to BID dosing from either analysis. CONCLUSION: The data indicate that overall more time is spent above the acidic threshold pH values when 80 mg/day of famotidine is administered TID vs BID. Key limitations included small study size with a short duration and lack of a baseline examination, but was compensated for by the cross-over and PK/PD modeling design. Although most of the comparisons in this proof of concept study were not statistically significant these results have important implications for future research on gastric acid lowering agents used for the prevention of NSAID-induced gastropathy.

Convection-enhanced delivery of cintredekin besudotox (interleukin-13-PE38QQR) followed by radiation therapy with and without temozolomide in newly diagnosed malignant gliomas: phase 1 study of final safety results.

OBJECTIVE: Cintredekin besudotox (CB), a recombinant cytotoxin consisting of interleukin-13 and truncated Pseudomonas exotoxin, binds selectively to interleukin-13R alpha2 receptors overexpressed by malignant gliomas. This study assessed the safety of CB administered by convection-enhanced delivery followed by standard external beam radiation therapy (EBRT) with or without temozolomide (Temodar; Schering-Plough, Kenilworth, NJ) in patients with newly diagnosed malignant gliomas. METHODS: After gross total resection of the tumor, two to four intraparenchymal catheters were stereotactically placed and CB (0.25 or 0.5 microg/mL) was infused for 96 hours. This was followed, 10 to 14 days later, by EBRT (5940-6100 cGy, 5 d/wk for 6-7 wk) with or without temozolomide (75 mg/m/d, 7 d/wk during EBRT). Safety was assessed during an 11-week observation period after catheter placement RESULTS: Twenty-two patients (12 men, 10 women; median age, 55 yr; 21 with glioblastoma multiforme and one with an anaplastic mixed oligoastrocytoma) were enrolled. None of the patients experienced dose-limiting toxicities in the first two cohorts (0.25 microg/mL CB + EBRT [n = 3] and 0.25 microg/mL CB + EBRT + temozolomide [n = 3]). One patient experienced a dose-limiting toxicity (Grade 4 seizure) in the third cohort (0.5 microg/mL CB + EBRT [n = 6]). Six patients in the final cohort (0.5 microg/mL CB + EBRT + temozolomide [n = 10]) completed treatment, and one patient experienced a dose-limiting toxicity (Grade 3 aphasia and confusion). Four patients were not considered evaluable for a dose decision and were replaced. CB related adverse events occurring in more than one patient were fatigue, gait disturbance, nystagmus, and confusion. No Grade 3 to 4 hematological toxicities were observed. CONCLUSION: CB (0.5 microg/mL) administered via convection-enhanced delivery before standard radiochemotherapy seems to be well tolerated in adults with newly diagnosed malignant gliomas. Further clinical study assessment is warranted.