Phase I study of pemetrexed in patients with relapsed or refractory acute leukemia or lymphoid blast phase chronic myelogenous leukemia

7068

Background: Pemetrexed is a folate antimetabolite that is clinically active in a number of different cancers. The purpose of this phase I trial was to define the dose-limiting toxicity (DLT), maximum tolerated dose (MTD), and recommended phase II dose (RP2D) of pemetrexed given with vitamin supplementation to patients with relapsed or refractory leukemia. Secondary objectives were pharmacokinetic (PK) and pharmacodynamic (PD) analyses of pemetrexed. Methods: Patients ≥15 years of age were enrolled with relapsed or refractory leukemia, Eastern Cooperative Oncology Group performance status ≤2, adequate renal and hepatic function, and life expectancy of ≥6 weeks. Enrollment was planned using a 3+3 dose escalation design. Intravenous pemetrexed was given at a starting dose of 900 mg/m2 over 1 hour every 3–4 weeks. Doses were escalated to 1,200, 1,500, 2,000, 2,700, and 3,600 mg/m2. Folic acid and Vitamin B12 were given with pemetrexed. Response was assessed by standard blood and bone marrow criteria. Toxicities were assessed using Common Terminology Criteria for Adverse Events, version 3.0. Results: Twenty-two patients entered the trial; median age was 50 years (range: 18–75); 15 patients had acute myeloid leukemia and 7 patients had acute lymphocytic leukemia (ALL). Two patients were ineligible and did not receive study drug. At the 1,200 and 1,500 mg/m2 dose levels, 1 patient per level developed grade (G) 3–4 liver enzyme and bilirubin elevations attributed to sepsis. At the 3,600 mg/m2 dose level, 1 patient had a G3 liver enzyme elevation and 2 added patients also had G3 liver toxicity. In addition, 2 patients in the 3,600 mg/m2 cohort developed G2 liver abnormalities. Based on liver toxicities, the DLT dose level was established at 3,600 mg/m2. Two patients died during the study due to disease progression and 1 patient discontinued due to a subdural hematoma of unknown cause. One patient with ALL achieved a partial response. There were no other objective responses. PK and PD data were not available for this report. Conclusions: The MTD and RP2D of pemetrexed were determined to be 2,700 mg/m2. Due to limited observed efficacy, a planned phase II trial was canceled.

[Table: see text]

Effect of race on the safety and efficacy outcomes of gemcitabine plus paclitaxel treated patients with metastatic breast cancer (MBC): Analyses from a phase III trial

1070

Background: Population-based studies often attribute racial disparities in breast cancer outcomes to differences in access to treatment, quality of care, or other socioeconomic factors. In a controlled clinical trial setting, these systemic differences between races should be minimal. To evaluate the potential impact of race on outcomes in a controlled clinical setting, we retrospectively analyzed data from a phase III trial (B9E-MC-JHQG; NCT00006459 ) of patients (pts) with MBC. Methods: Analyses were performed on the JHQG trial database after 440 total pt deaths for both study arms. Demographics, safety, and efficacy were analyzed using safety population data from 3 racial groups: Caucasian (CA), Asian (AS), and Hispanic (HP). CA was the reference for all pair-wise comparisons. The logistic model was used to calculate odds ratios for tumor response and the Cox model was used to calculate hazard ratios for time-to-event parameters, adjusting for significant prognostic factors. Results: We report analyses of the gemcitabine (G) + paclitaxel (T) treatment arm. Demographics were balanced across the 3 groups with the exception that ER+/PR+ status was lower for AS compared to CA and HP; unknown ER/PR status was higher for AS. AS had significantly less neutropenia, fatigue, and nausea, but more anemia compared to CA and HP. Median number of treatment cycles completed was lower, but mean dose intensities for G and T were slightly higher, for AS. Response rate and progression-free survival were similar in the 3 groups. Overall survival (OS) and post-study chemotherapy (PSC) were significantly reduced for AS. Conclusions: Our analysis suggests that AS pts were better able to tolerate GT therapy compared to CA and HP pts. However, AS pts had the poorest OS outcome of the 3 racial groups, potentially due to reduced participation in PSC.

[Table: see text]

[Table: see text]

Phase III trial of gemcitabine plus docetaxel (GD) compared to capecitabine plus docetaxel (CD) with planned crossover to the alternate single agent in metastatic breast cancer (MBC)

1000

Background: GD and CD are efficacious in patients (pts) with MBC. This study compared safety and efficacy of GD and CD induction regimens, where the alternate, single-agent, crossover therapy (GD to C or CD to G) was predetermined. Primary endpoint was time to progressive disease (TTP). Secondary endpoints included toxicities, overall response (ORR), and overall survival (OS). Methods: This multicenter, open-label, phase III study enrolled MBC pts with possible prior anthracycline therapy, adjuvant or neoadjuvant taxane therapy, but no taxane therapy for MBC ≤6 months prior to entry. Enrollment of 442 pts (221 per arm) was planned with 385 progressions required to achieve 80% power for a 2-month observed difference in median TTP between arms. Pts were randomized to: GD: G 1,000mg/m2 Days 1, 8 plus D 75 mg/m2 Day 1, q21 days; or CD: C 1,000 mg/m2 BID, Days 1–14 plus D 75 mg/m2 Day 1, q 21 days. Upon disease progression, pts were given crossover C or G at doses and schedules identical to induction. ORR was assessed by RECIST. Results: Demographics of 472 enrolled pts were balanced between arms; 57% had prior anthracycline. GD caused greater myelosuppression than CD, but without greater febrile neutropenia. Gastrointestinal toxicities, mucositis, and hand-foot syndrome were greater with CD. More pts in the CD arm (n=61, 26.2%) versus the GD arm (n=41, 17.2%) discontinued due to toxicity (p=0.023). ORR, TTP, and OS were not significantly different comparing GD and CD. However, ORR and TTP were significantly greater for the GD to C crossover monotherapy compared to CD to G. Post-hoc analysis of crossover pts showed that the TTP sum from induction through crossover was 6.1 months greater for GD to C. Conclusions: GD and CD had similar efficacy with toxicity profiles consistent with prior clinical experience. Results suggest that the GD to C crossover sequence may provide a clinical benefit over CD to G.

[Table: see text]

[Table: see text]

Outcomes of simultaneous heart-kidney transplant in the US: a retrospective analysis using OPTN/UNOS data

Simultaneous heart-kidney transplantation (SHK) remains uncommon in the US. We examined outcomes of SHK compared to heart transplant alone (HTA) and deceased donor kidney transplant (DDKT). Data from OPTN/UNOS heart and kidney data bases were used to identify 16,710 HTA, 263 SHK transplants and 68,833 DDK transplants between 1998 and 2007. Outcomes included patient survival (PS), acute cardiac and renal rejection and renal graft survival (rGS). The adjusted risk of death was 44% lower with SHK compared to HTA. Over half of SHK were performed in cases where pretransplant dialysis was not initiated. In these cases, there was no significant difference in the risk of death between SHK and HTA (HR 1.01; 95% CI 0.67-1.50). Recipients of SHK had worse 1-year rGS and PS and had a higher relative risk of overall renal graft loss compared to DDKT recipients. One-year rates of cardiac (14.5%) and renal (6.5%) rejection were lower in SHK compared to HTA and DDKT, respectively. Recipients of SHK had a lower adjusted risk of death compared to HTA recipients, particularly in patients who required pretransplant dialysis. These data suggest that SHK should be considered in heart transplant candidates with renal failure requiring dialysis, whereas the utility of SHK in cases of renal failure not requiring dialysis warrants further study.

Can machine perfusion decrease the likelihood of discard among biopsied kidneys?

Many factors, such as donor risk factors and renal function, have been shown to be associated with an increased likelihood of discard after recovering kidneys from deceased donors. When these factors are insufficient for assessment, renal biopsy is often performed at the time of harvest to assess suitability. Our aims were to identify factors that predict the discard of a biopsied kidney and to assess the impact of machine perfusion (MP) on kidney discard. We biopsied 678 kidneys from deceased donors aged >or=40 years from 2001 to 2006. We used a logistic regression model to estimate the adjusted odds ratios for kidney discard. Thirty-nine percent (n = 261) of biopsied kidneys were discarded. Kidneys with glomerulosclerosis (GS) > 20% had the highest likelihood of discard. Other significant predictors of discard included extreme donor age, final resistance (>40), atherosclerosis, interstitial fibrosis, arteriolosclerosis, and terminal serum creatinine value (SCr) > 1.5 mg/dL. MP kidneys (n = 69) were less likely to be discarded than cold storage (CS) kidneys after adjusting for other factors (adjusted odds ratio = .13, P < .001). In conclusion, abnormal biopsy findings were associated with the highest likelihood of discard. MP was used in only 10% of the cases; however, the use of MP was associated with a decreased likelihood of discard among biopsied kidneys.

Insulin resistance phenotypes and coronary artery disease in a native Pakistani cohort

OBJECTIVE

To determine the relationship between insulin resistance (IR) and atheroma burden in Pakistanis.

METHODS

A prospective case-control study of 400 patients selected for the presence/absence of angiographic disease. Coronary atheroma burden was quantified and IR and cardiovascular risk factors were measured.

RESULTS

The patients were divided into two groups by QuickI score. Waist circumference (90 +/- 10 vs. 90 +/- 9 cm; p = 0.7) was similar but the groups differed in body mass index (26.5 +/- 3.7 vs. 24.2 +/- 3.5 kg/m(2); p < 0.001) and waist:hip ratio (0.94 +/- 0.09 vs. 0.90 +/- 0.06; p < 0.001). Lipid parameters showed similar high-density lipoprotein cholesterol (HDL-C) (0.77 +/- 0.23 vs. 0.82 +/- 0.22 mmol/l; p = 0.1) differences in triglycerides [1.32 (0.08-3.98) vs. 1.12 (0.37-3.61) mmol/l; p = 0.01], but no difference in low-density lipoprotein cholesterol (LDL-C) (2.75 +/- 1.00 vs. 2.90 +/- 0.94 mmol/l; p = 0.14). In insulin-resistant patients C-reactive protein (CRP) [6.8 (0.3-175.1) vs. 3.9 (0.2-57.9) mg/l: p < 0.001], sialic acid (82 +/- 14 vs. 77 +/- 15 mg/l; p < 0.001) aspartate transaminase [24 (7-171) vs. 21 (7-83) IU/l; p < 0.001] and gamma-glutamyl transferase [27 (8-482) vs. 21 (7-168) IU/l; p = 0.005] levels were increased. In insulin-resistant patients (n = 187), coronary artery disease (CAD) burden correlated (r = 0.55) with age (beta = 1.62; p < 0.001), HDL-C (beta = -53.2; p < 0.001), lipoprotein (a) (beta = 11.4; p = 0.007), smoking (beta = 7.98; p = 0.004), CRP (beta = 6.06; p = 0.03) and QuickI index (beta = -146; p = 0.04). In contrast in insulin-sensitive patients (n = 178) CAD burden (r = 0.46) correlated with LDL-C (beta = 10.0; p = 0.02), CRP (beta = 7.13; p = 0.03), HDL-C (beta = -38.1; p = 0.03), and weakly with age (beta = 0.73; p = 0.07) and smoking (beta = 5.52; p = 0.09).

CONCLUSIONS

Indian Asians show a dichotomous insulin-resistance phenotype. Atheroma is associated with low HDL-C and inflammation associated in all but LDL-C is a factor in the insulin sensitive in contrast to age and extent of IR in the insulin resistant.

Effect of race on the safety and efficacy of pemetrexed (P) therapy in locally advanced and metastatic non-small cell lung cancer (NSCLC)

18082

Background: P is a multitargeted antifolate active in NSCLC. While a number of clinical trials have evaluated P safety and efficacy in general patient populations, little is known of the possible impact of race on the utility of P therapy in NSCLC. The objective of this post-hoc analysis was to evaluate the effect of race on the safety and efficacy of P (single-agent or in combination) in patients with locally advanced and metastatic NSCLC. Methods: Data from 6 trials with at least 5% non-Caucasian patients were pooled for analyses. One Phase III trial evaluated P in a second-line setting. All other trials used P in Phase II first-line settings. Patients were given at least one dose of P (single-agent or in combination) at 600 mg/m2 (59 patients) or 500 mg/m2 (469 patients) every 21 days. Demographic, safety, and efficacy data were stratified broadly by race, to either Caucasian or non-Caucasian groups. Kaplan-Meier method was used to estimate median survival. The Cox model was used to calculate the hazard ratio (HR) for survival, adjusting for significant prognostic factors, including disease stage, performance status, gender, and line of treatment. Results: Results are summarized in the data table below. The adjusted HR for survival (non-Caucasian versus Caucasian) was 0.89 (p=0.365). Conclusions: In this post-hoc analysis of results from clinical trials using P therapy in NSCLC, race did not have a statistically significant impact on response rate, disease control rate, or survival. However, P therapy appeared to be better tolerated by non-Caucasian patients.

[Table: see text]

No significant financial relationships to disclose.

Gemcitabine plus paclitaxel and gemcitabine plus docetaxel in first- or second-line metastatic breast cancer: A phase II randomized trial

1046

Background: The combination of gemcitabine (G) with paclitaxel (P) has proven efficacy in the first-line treatment of metastatic breast cancer (MBC). In addition, the combination of G with docetaxel (D) has shown activity in several nonrandomized, Phase II, MBC trials. This randomized Phase II trial was conducted to assess the efficacy and safety of G plus P and G plus D combination regimens in previously treated patients with MBC. Methods: Patients with locally advanced or metastatic breast cancer were randomized equally into two groups to receive either GP (G 1,250 mg/m2 IV on Days 1 and 8 plus P 175 mg/m2 IV on Day 1) or GD (G 1,000 mg/m2 IV on Days 1 and 8 plus D 75 mg/m2 IV on Day 1). Treatment was administered every 21 days and continued until disease progression or undue toxicity. Planned enrollment was 112 patients (56 per group). The primary study objective was tumor response assessed using RECIST criteria. Toxicities were assessed using the NCI Common Toxicity Criteria, Version 2.0. Results: Twenty-five patients were enrolled in each treatment group and accrual was stopped due to slow enrollment. In the GP group, only 23 patients were evaluable for response and 24 patients were monitored for safety. One patient did not receive study medication and was not assessed for efficacy or safety. A second patient was determined to have nonmeasurable disease at baseline and was not assessed for response. Overall response rate was 39% (95% CI 20, 61) for the GP group and 40% (95% CI 21, 61) for the GD group. The median number of cycles administered was 6.5 in the GP group and 6.0 in the GD group. Detailed study results are summarized in the table below. Conclusions: These results show that GP and GD combination regimens are both efficacious in the treatment of MBC, with similar response rates and manageable toxicity profiles.

[Table: see text]

No significant financial relationships to disclose.

The extended learning curve for laparoscopic fundoplication: a cohort analysis of 400 consecutive cases

Many studies have looked at the learning curve associated with laparoscopic Nissen fundoplication (LNF) in a given institution. This study looks at the learning curve of a single surgeon with a large cohort of patients over a 10-year period. Prospective data were collected on 400 patients undergoing laparoscopic fundoplication for over 10 years. The patients were grouped consecutively into cohorts of 50 patients. The operating time, the length of postoperative hospital stay, the conversion rate to open operation, the postoperative dilatation rate, and the reoperation rate were analyzed. Results showed that the mean length of operative time decreased from 143 min in the first 50 patients to 86 min in the last 50 patients. The mean postoperative length of hospital stay decreased from 3.7 days initially to 1.2 days latterly. There was a 14% conversion to open operation rate in the first cohort compared with a 2% rate in the last cohort. Fourteen percent of patients required reoperation in the first cohort and 6% in the last cohort. Sixteen percent required postoperative dilatation in the first cohort. None of the last 150 patients required dilatation. In conclusion, laparoscopic fundoplication is a safe and effective operation for patients with gastroesophageal reflux disease. New techniques and better instrumentation were introduced in the early era of LNF. The learning curve, however, continues well beyond the first 20 patients.

Assay of HIV gp41 amino acid sequence to identify baseline variation and mutation development in patients with virologic failure on enfuvirtide

In this study, we retrospectively assessed a gp41 genotypic assay in 404 enfuvirtide-naïve individuals (340 clade B, 64 non-B clade) to determine the prevalence of baseline polymorphisms and in 41 patients virologically failing enfuvirtide to determine correlates of resistance to this agent. Conserved and polymorphic regions of gp41 were identified in clade B isolates, with 127 of 328 codons (38.7%) being highly conserved (<1.0% variation) and 74 of 328 codons (22.6%) being partially conserved (1.0-5.0% variation). Polymorphisms were observed throughout gp41 in non-B clade virus sequences compared to the clade B reference strain, ranging from 53 natural substitutions in clade D to 76 in clade A. Insertions were common at positions 3, 105, 215 and 276. In the patients failing enfuvirtide, mutations were detected in the 10 amino acid region at positions 36-45 in all plasma virus sequences. Six additional mutations were selected outside of the common region which may be clinically significant at positions 33, 73, 75, 126, and 138. Two or three mutations at positions 36-45 were observed in the majority of plasma virus sequences from patients with virologic failure following the use of enfuvirtide. Further study is required to determine the clinical relevance of the clade related polymorphisms and the new mutations identified in the patients with virologic failure.

Methicillin-resistant Staphylococcus aureus: awareness and perceptions

The purpose of this study was to investigate levels of awareness and the perceived risk of contracting methicillin-resistant Staphylococcus aureus (MRSA) amongst patients/visitors and employees of the UK National Health Service (NHS). Differences between the two cohorts were also investigated, particularly sources of information about MRSA. In March 2005, a piloted questionnaire was circulated to 50 patients/visitors and 100 NHS employees (25 doctors, 25 nurses, 25 domestics and 25 porters). No information was returned from porters, but the overall response rate was 67%. There was a high level of awareness of MRSA among both patients/visitors (94%) and NHS employees (100%). General media was the most common source of information for patients/visitors (68%) compared with 24% of NHS employees (P < 0.01). Perceived risk of contracting MRSA was very similar among patients/visitors and NHS employees (34% vs 35%, P > 0.10). Fifty-two percent of doctors felt that they were at risk compared with 13% of domestic employees. In conclusion, this study showed a high level of awareness among the general public and healthcare workers alike.

Selenium supplementation of young red deer (Cervus elaphus)

Two selenium (Se) supplementation trials were conducted in successive years involving a total of 70 red deer calves 3-15 months of age grazing pasture containing 30-57 ppb of Se on a dry matter basis. The trials compared growth rate, whole blood Se and glutathione peroxidase (GSHpx) concentrations of calves which received periodic doses of oral Se or a single injection of barium selenate (equivalent to 50 mg Se) or no Se supplementation. There were no significant weight gain differences between treated and untreated groups in either trial. Whole blood GSHpx levels were strongly correlated with blood Se levels (r = 0.9278) and produced the following regression equation: GSHpx = 0.0155 Se - 2.292. In both years the 3 month old calves had GSHpx levels of 6-9 kU/I which probably derived from maternal transfer of Se. The GSHpx levels in unsupplemented calves declined from these levels to a minimum in winter (group means approximately 2.6) and then progressively rose the following spring and summer. Periodical oral dosing with Se or a single injection of barium selenate significantly elevated blood Se and GSHpx levels throughout the trials.