Temozolomide (TMZ) and bevacizumab (BV) as initial treatment for unresectable or multifocal glioblastoma multiforme (GBM)

e13025

Background: GBMs are vascular tumors and inherently resistant to therapy. The prognosis for patients is poor with a median survival of 9–15 months. Patients with unresectable or multifocal GBMs have an even poorer prognosis, with a median survival of 6–8 months. Given the angiogenic phenotype of GBM, we conducted a phase II trial of upfront BV and 5-day TMZ in newly diagnosed unresectable or multifocal GBMs. Methods: Patients had histologically documented newly diagnosed GBMs that were unresectable or multifocal. Patients received up to 4 cycles of temozolomide at 200 mg/m2/d days 1–5 and BV at 10 mg/kg on days 1 and 14 in a 28 day cycle. An MRI was performed after every cycle and patients continued on therapy as long as there was no tumor progression, grade 4 non-hematologic toxicity or recurrent grade 4 hematologic toxicity after a dose reduction to 150 mg/m2/d. The primary endpoint was tumor response using the modified MacDonald criteria plus FLAIR and T2 sequences to evaluate non-enhancing tumor. Results were evaluated by two independent reviewers. Results: 41 patients were enrolled between October 2007 and September 2008 and 31 patients were analyzed after completion of cycle 2. As the best response, there were 8 (25.8%) partial responses, 19 (61.3 %) patients with stable disease, and 4(12.9 %) had disease progression. 19 of the 41 patients enrolled completed four cycles without tumor progression. The regimen was tolerable, with 3 grade 4 hematologic toxicities including neutropenia and thrombocytopenia. There were 2 grade 4 non-hematologic toxicities, including pulmonary embolism. There were two CNS hemorrhages. The median PFS was 3.6 months (2.9 months, 4.4 months) and the median OS was 4.5 months (3.7 months, 5.3 months). Conclusions: Upfront temozolomide and bevacizumab was well tolerated, but synergistic chemotherapy or growth factor inhibitors need to be added to produce meaningful clinical benefit, particularly for unresectable or multifocal GBM.

No significant financial relationships to disclose.

Survivorship care planning needs in diffuse large B-cell lymphoma (DLBCL)

e20703

Background: Cancer survivorship care plans inform and direct care in the survivorship setting. These care plans should be tailored to individual medical information, needs, and circumstances, as providing excess information can be overwhelming. According to survivors of DLBCL, what are important components of care plans? Methods: We developed a 22-question survey to define and rate important survivorship health and psychosocial concerns; items were developed based upon literature review and experience in survivorship clinics. Through the tumor registry, 178 patients were identified who had been treated with curative intent (including stem cell transplant) without evidence of recurrence since 1/2006 and who continue to receive care at Duke University Medical Center. Results: Sixty-five survivors consented and returned a completed IRB approved survey (response rate 37%). Responders: 58% female, 88% white, and 75% from North Carolina, with mean age at diagnosis of 59.7 years; 42% had stage four disease at diagnosis and 12% had had a transplant. The majority of survey participants (62%) indicated that they preferred their oncologist and primary care provider to jointly manage their survivorship care. On a 1–10 scale, the top scoring issue (mean 9.67) was “A plan to screen for possible return of your cancer.” Other top scoring issues (mean 8.81 - 9.48) related to cancer history (treatment, complications, stage or late effects) and non-cancer health monitoring. The lowest scoring needs related to social support, sexuality, financial/legal issues, alternative medicine, and mental health services (mean 5.45 - 7.12). There was greater agreement among responders on the importance ratings of the higher scoring issues than the lower scoring ones (standard deviation 1.01 - 2.34 vs. 3.18 - 3.56). Conclusions: DLBCL survivors prefer care plans focused on medical issues, and health care coordinated jointly by oncologists and primary care physicians. The lower importance of psychosocial issues and alternative medicine in this population differs from survivors of other cancers, underscoring the importance of tailoring care plans by cancer subgroup.

No significant financial relationships to disclose.

Effect of daclizumab on TReg counts and EGFRvIII-specific immune responses in GBM

2034

Background: TRegs are increased in patients with GBM and constitutively express the high affinity interleukin-2 receptor (IL-2Rα). Treatment with an antibody that blocks IL-2Rα signaling functionally inactivates and eliminates TRegs without inducing autoimmune toxicity in murine models. We hypothesized that daclizumab, a commercially-available, IL-2Rα-specific antibody would function identically.Methods: A randomized phase II clinical trial assessed the effects of daclizumab in the context of the cancer vaccine, CDX-110, which is comprised of an EGFRvIII-specific peptide sequence linked to KLH. EGFRvIII is a constitutively activated and immunogenic mutation not expressed in normal tissues, but widely expressed in GBMs and other neoplasms. In patients with newly-diagnosed, EGFRvIII+ GBM, after resection and radiation/TMZ, patients received CDX-110 vaccinations biweekly x 3, then monthly until tumor progression in combination with TMZ (200 mg/m2 x 5/28 days). Half the patients were randomized to receive daclizumab (1mg/Kg x1) at the first vaccine. The others received saline in a double-blinded fashion.Results: There were no drug related SAEs. EGFRvIII-specific immune responses were generated in all patients, and all immune responses were sustained or enhanced during subsequent TMZ cycles. Preliminary analysis (n = 4) suggests that daclizumab reduces Treg (CD4+CD25+CD45RO+FOXP3+) numbers [change 82.4 ± 7.1% from baseline (p = 0.011; t-test)] without reducing overall CD8+ or CD4+ T-cell counts. Tregs decreased only 3.7 + 11.0% after vaccination in the saline treated group during the same interval. Preliminary analysis (n = 4) also suggest that daclizumab enhanced EGFRvIII-specific immune responses (p = 0.01; t-test) and enhanced the titer of cytotoxic EGFRvIII-specific IgG1 isotype antibodies compared to the saline treated group (p = 0.003; t-test) and compared to previously vaccinated patients who did not receive daclizumab (p = 0.0015; t-test). TTP and OS survival in both arms has not been reached. Conclusions: Daclizumab may reduce Treg counts in patients with GBM. TMZ and daclizumab may enhance EGFRvIII-targeted immune responses despite lymphodepletion. These combinations are currently under further investigation.

[Table: see text]

Clinical factors predictive of overall survival (OS) and the identification of prognostic groups in patients (pts) with unresectable stage III non-small cell lung cancer (NSCLC) treated with chemoradiotherapy on Cancer and Leukemia and Group B trial (CALGB) 39801

7535

Background: CALGB 39801 was designed to test whether treatment with induction chemotherapy and concurrent chemoradiotherapy (arm B) would improve OS in comparison to identical chemoradiotherapy alone (arm A), and demonstrated no significant benefit in OS for induction therapy. The objective of this analysis was to identify factors predictive of OS, and to use relevant factors to dichotomize pts into prognostic groups. Methods: Between July 1998 and May 2002, 331 pts were studied and included in a Cox proportional hazard regression analysis investigating previously identified prognostic factors: age (< 70 vs. ≥ 70 years), gender, race/ethnicity, hemoglobin (hgb) (< 13 vs. ≥13), performance status (PS) (0 vs.1), pretreatment weight loss (wt loss) (<5% vs. ≥ 5%), and treatment arm. Results: Cox regression analysis identified weight loss ≥ 5%, age ≥ 70, PS of 1, and hgb < 13 as predictive of worse survival (p<0.05), but not treatment arm (p=0.55). The median survival for pts with 0 (n=66), 1 (n=100), 2 (n=100), or ≥ 3 (n=65) risk factors were 24, 18, 10, and 8 months, respectively (p=0.0001). The pts were dichotomized into “poor prognosis” (PP) defined as ≥2 factors (n=165) and “good prognosis” (GP) defined as ≤ 1 factors (n=166). The hazard ratio (HR) for overall survival for the PP in comparison GP was 1.88 (95% CI, 1.49 to 2.37; p-value < 0.0001); the median survival times (MST) observed were 9 and 18 months, respectively (p<0.0001). The reasons for discontinuing treatment, and the rates of hematologic and non-hematologic adverse events were similar between the two groups. In the PP group the OS was similar between arms A (n=82) and B (n=83) (HR=0.97, 95% CI, 0.70 to 1.4; p=0.34); MST of 8.7 and 9.5 months, respectively. In the GP the OS was similar between arms A (n=79) and B (n=87) (HR=0.86, 95% CI, 0.63 to 1.1; p=0.87); MST of 19.3 and 17.6 months, respectively. Conclusions: Factors predictive of OS can be used to dichotomize pts into prognostic groups. Induction chemotherapy was not beneficial in either prognostic group.

No significant financial relationships to disclose.

Epidermal growth factor receptor variant III (EGFRvIII) vaccine (CDX-110) in GBM

2021

Background: Unlike conventional therapies for GBM, immunologic targeting of tumor-specific gene mutations allows precise eradication of neoplastic cells with reduced toxicity. EGFRvIII is a constitutively activated and immunogenic mutation not expressed in normal tissues, but widely expressed in GBM and other neoplasms. The cancer vaccine CDX-110 is comprised of an EGFRvIII-specific peptide sequence linked to keyhole limpet hemocyanin (KLH). Methods: A phase II multi-center trial assessed the immunogenicity and efficacy of CDX-110 in patients with newly-diagnosed, EGFRvIII+ GBM. After resection and radiation / TMZ, patients received CDX-110 vaccinations biweekly x 3, then monthly until tumor progression. Sequential cohorts received CDX-110 alone [ACTIVATE (n = 18)] or in combination with TMZ (200 mg/m2 x 5/28 days [ACT II A (n = 13)]) or (100 mg/m2 x 21/28 days [ACT II B (n=10)]). Results: Reversible systemic drug hypersensitivity reactions were seen in 1 ACTIVATE and 4 ACT II patients. Two patients had non-specific changes on MRI which were possibly due to the vaccine but which resolved. Despite grade 2 or 3 lymphopenia in all ACT II patients, EGFRvIII-specific immune responses were generated in all patients, and all immune responses were sustained or enhanced during subsequent TMZ cycles. Although ACT II B patients had more severe TMZ-induced lymphopenia, they developed greater EGFRvIII-specific immune responses (p = 0.028) when compared to ACT II A. EGFRvIII-specific IgG1 also increased in avidity with vaccination (Ka>>2x109M-1) in a randomly selected subset of 4 patients (p = 0.000068). Of the 23 recurrent tumors studied, 18 lost EGFRvIII expression (p = 0.001). There are no significant differences between ACT II A and B in estimated median TTP (18.5 vs. 14.9 months, p = 0.31) and OS (23.6 vs. 19.9 months, p = 0.75). ACTIVATE TTP (14.2 months) and OS (26.0 months) and ACT II TTP (15.2 months) and OS (23.6 months) compare favorably to a TMZ-treated, matched historical control group (TTP: 6.3 months; OS: 15.0 months). Conclusions: CDX-110 vaccination in patients with GBM appears very promising. TMZ enhances immune responses despite lymphodepletion. CDX-110 with simultaneous TMZ is under further investigation in a larger phase II trial.

[Table: see text]

Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) evaluation in glioblastoma (GBM) patients treated with bevacizumab (BEV) and irinotecan (CPT-11)

2029

Background: Significant responses seen in GBM patients treated with BEV and CPT-11 generated the need to develop ways to predict clinical benefit. DCE-MRI can be used to evaluate the microvasculature within tumors. DCE-MRI uses Ktrans, a volume transfer constant of contrast agent between blood plasma and the extravascular extracellular space, to determine vascular permeability. A 50% reduction in Ktrans is clinically meaningful. We report a phase II trial to determine the correlation between vascular permeability and radiographic response in GBM patients treated with the combination. Methods: Eligibility included patients with recurrent GBM. Both agents were given every 14 days. All patients received BEV at 10 mg/kg IV. CPT-11 was dosed at 340 mg/m2 for patients on enzyme inducing antiepileptic drugs (EIAED) and 125 mg/m2 for patients not on EIAED. Radiographic responses were assessed every 6 weeks. DCE-MRIs were performed before administration of chemotherapy, one day after treatment and after the first cycle. The primary endpoint was to examine the effect of BEV and CPT-11 treatment on vascular permeability as measured by percent change from baseline in Ktrans. Results: Twenty patients were enrolled, with a median age of 49.5 years. Fifteen patients are assessable for response. Best responses include one patient with complete response, 8 with partial response (response rate=60%), six patients with stable disease, and one with disease progression. Ktrans values are available for 13 patients; data are not available for seven patients (too early: 4, technical difficulty: 3). A reduction in Ktrans by 50% was observed in 6 patients one day after treatment and in 12 patients at the end of cycle 1. Changes in Ktrans value were highly correlated with the percentage decline in tumor volume from baseline to end of cycle one (Pearson correlation = 0.82; p=0.0006). Fifteen patients are still on study. Five patients came off due to disease progression. Conclusions: The utilization of DCE-MRI to determine a reduction in vascular permeability following a combination of BEV and CPT-11 is feasible and correlates significantly with the degree of tumor volume decrease.

No significant financial relationships to disclose.

Overall survival of primary glioblastoma (GBM) patients (pts) receiving carmustine (BCNU) wafers followed by radiation (RT) and concurrent temozolomide (TMZ) plus rotational multi-agent chemotherapy

2070

Background: Treatment of pts with primary GBM using BCNU wafer implantation at initial surgery (Westphal, 2003) as well as the administration of TMZ concurrently and after RT (Stupp, 2005) have each been shown to increase survival. Thus, we hypothesize that the use of the combination of BCNU wafer followed by RT and concurrent (TMZ) plus rotational multi-agent chemotherapy (CCNU, TMZ, CPT-11) will increase survival compared to pts that do not receive BCNU wafers. Methods: Retrospective IRB-approved analysis was conducted on 85 eligible GBM pts who received surgery with (36 pts) and without (49 pts) BCNU wafer insertion followed by RT and concurrent (TMZ) plus adjuvant rotational multi-agent chemotherapy. Survival was estimated within treatment groups using the Kaplan-Meier method. Cox regression was used to evaluate the effect of BCNU wafers on survival after controlling for covariates such as RPA (Recursive Partition Analysis) class, race, and gender. Results: Within the non-BCNU wafer cohort, 39% of patients were younger than 50 and 89% had KPS>70%. Within the BCNU cohort, 31% of patients were younger than 50 and 94% had KPS>70. Overall 1- and 2-year survival for the non-BCNU wafer cohort was 67% (95% CI: 55%, 82%) and 27% (95% CI: 17%, 42%), respectively, with a median survival of 72.7 wks (median follow-up: 123.9; range 14.3–198). Overall 1-year survival for the BCNU wafer cohort was 78% (95% CI: 65%, 93%) with a median survival of 89.6 wks (median follow-up: 118.6; range 26.7–192.1). Given the trends towards significance (p=0.092) between the two groups using a log-rank test, a Cox regression model to control for known prognostic factors was examined: Conclusions: After controlling for the effects due to RPA class, a significant difference in survival is found between treatment groups (p = 0.0325) and patients receiving BCNU wafers have a lower risk of death (HR = 0.548) than patients not receiving BCNU wafers.

[Table: see text]

No significant financial relationships to disclose.

Comorbidity, age and stage at diagnosis in colorectal cancer (CRC)

6554

Background: Stage at diagnosis is a crucial predictor of outcome in CRC. The purpose of this study is to determine if comorbidity and age affect the stage at which CRC is diagnosed. Identifying variables that influence stage might improve outcomes in CRC. Due to frequent contact with the health care system, we hypothesize that patients with greater comorbidity and older age are more likely to be diagnosed with early-stage disease. Methods: We present data from two distinct patient populations: using the Cancer Care Outcomes Research and Surveillance Consortium (CanCORS) database, we identified CRC patients treated at 15 Veterans Administration (VA) hospitals from 2003-present. We also identified CRC patients treated from 2003-present at 10 non-VA, fee-for-service (FFS) practices in North and South Carolina. Data were abstracted by retrospective chart review. Comorbidity was calculated by the Charlson comorbidity index (CCI) with high comorbidity defined as CCI =3. Older age was defined as age =70 years. Data were analyzed using logistic regression where the odds of late stage at diagnosis were modeled as influenced by older age, high CCI, and race. The analysis included estimation of adjusted and unadjusted odds ratios. Results: 347 VA and 282 FFS patients were included. 98% VA vs 50% FFS were male; 43% VA vs 27% FFS were aged =70; 56% VA vs 70% FFS were white; 26% VA vs 44% FFS presented with metastatic CRC; and 21% VA vs 6% FFS had a CCI =3. In both patient populations, regression analysis showed that older age, high CCI and white race were not significant predictors of stage at diagnosis. VA 95% confidence intervals (CI's) were 0.52–1.41 (age =70), 0.50–1.75 (CCI =3), and 0.42–1.11 (white race). FFS 95% CI's were 0.52–1.53 (age =70), 0.36–2.78 (CCI =3), and 0.74–2.11 (white race). Broader 95% CI's in the FFS analysis were due to smaller sample size. Conclusions: In CRC patients, age and comorbidity were not related to stage at diagnosis. The findings are similar whether the patients were treated in a fee-for-service or VA health system. While older age and greater illness might provide more contact with the health care system, this exposure did not result in earlier diagnosis of CRC. Future studies will examine the impact of comorbidity on CRC treatment and survival.

No significant financial relationships to disclose.

Radiation and concurrent temozolomide followed by rotational multi-agent chemotherapy for glioblastoma (GBM) patients

2068

Background: GBM is the most lethal type of brain tumor with a 1 yr median survival. We hypothesized that GBM patients who receive adjuvant rotational multi-agent chemotherapy (temozolomide, CCNU, and CPT-11) have improved overall survival when compared to patients receiving single agent adjuvant regimens (carmustine, temozolomide). Methods: We conducted an IRB-approved retrospective data analysis of 80 primary GBM patients who received radiation therapy and concurrent temozolomide followed by 12 mos of adjuvant rotational multi-agent chemotherapy. All patients with the intent to treat were included in the analysis. The survival experience of the Duke cohort was examined within specific patient subgroups defined by the original Radiation Therapy Oncology Group (RTOG) recursive partition analysis (RPA). These data were compared to the recently published Stupp RPA analysis (JCO 2006) and the RTOG trial (radiation alone). Results: 73% were male. Mean age was 52 yrs (range 21–76 yrs); 39 % were < 50 yrs.. 82% were white. WHO performance status was: 0, 14%; 1, 62%; 2, 20%; and 3, 4%. Overall survival was 59% (95% CI: 49%, 71%) at 1 yr and 31% (23%, 43%) at 2 yrs. Median survival was 65.1 wks (49.7, 78.9) with median follow-up of 122.1 wks.. No difference in the 2-yr overall survival rate in RPA classes III-IV was detected between the Duke and Stupp regimens (p>0.4733), but 66% (33, 77) of the Duke rotational therapy GBM patients are living longer than the RTOG patients (p > 0.0086). Univariate Cox Hazard ratio of 1.27 (0.522, 3.08) did not correlate MGMT status with survival (p > 0.60). Conclusions: (1) Concurrent Temozolomide and radiation followed by rotational chemotherapy is an effective therapy compared to recent published gold standard adjuvant regimens. (2) Concurrent Temozolomide and radiation followed by rotational chemotherapy resulted in a statistically significant survival benefit compared to RTOG trial. (3) Lack of correlation between MGMT and overall survival suggests that agents whose damage is not repaired by MGMT may be an important therapeutic approach. (4) Future prospective randomized trials with concurrent Temozolomide and radiation must compare post radiation multi-modality regimens.

No significant financial relationships to disclose.

Measuring clinically significant chemotherapy-related toxicities using Medicare claims from CALGB breast and lung cancer trial participants

6595

Background: Because the elderly are numerically underrepresented in cancer clinical trials, the benefits and toxicities of cancer therapies in the general population of elderly patients is not known. Nevertheless, clinicians need such information. A solution may be found in analyses of observational data. Specific Aim: We performed a criterion validation study to determine the accuracy with which observational Medicare claims data measure clinically significant chemotherapy-related toxicities in elderly Medicare beneficiaries with cancer. Methods: We created a cohort of 175 elderly clinical trial patients treated on two Cancer and Leukemia Group B (CALGB) trials (i.e., 9,344 adjuvant breast and 9,730 advanced lung cancer trials) and merged participants’ CALGB data with their Centers for Medicare and Medicaid Services (CMS) data. From CALGB data, we identified all grade III/IV toxicities with a frequency of ≥3%. We reviewed diagnostic and procedure codes from CMS coding manuals, developed initial algorithms to measure the toxicities and then finalized the algorithms after empiric review of individual patients’ actual CMS codes incurred during the observation period (i.e., date of first trial treatment through 90 days following last trial treatment). We compared results of each of our CMS toxicity algorithms to gold-standard of CALGB grade III/IV toxicity information in order to calculate the CMS algorithms’ test characteristics. Results: The following 15 grade III /IV chemotherapy-related toxicities occurred in ≥3% of the 175 patients: white blood cell, hemoglobin, platelets, anorexia, nausea, vomiting, diarrhea, stomatitis, sensory neuropathy, motor neuropathy, motor or sensory neuropathy, dyspnea, hyperglycemia, infection, and malaise. Of these, only the CMS-based algorithm measuring ‘grade III/IV vomiting‘ had a sensitivity, specificity, and area under the ROC of ≥ 80%. Conclusions: The results of this preliminary study suggest that CMS claims data may be of only limited value in measuring clinically significant chemotherapy- related toxicities in elderly Medicare beneficiaries with cancer. Future research will focus on confirming these findings in a larger and more diverse patient sample.

No significant financial relationships to disclose.

Choice of adjuvant and first-line metastatic chemotherapy (CT) for colorectal cancer (CRC) treated in the Carolinas

17039

Background: CT choice is influenced by many factors including published evidence, guidelines, cost, reimbursement, patient considerations, key opinion leaders, and anecdote. Substantial locoregional variation in practice patterns can exist, and therefore studies of locoregional practice provide important information on local drivers of care. Methods: Using a population-based strategy, we identified CRC patients who developed metastatic disease since 6/1/03 from 9 Duke Oncology Network community practices and 1 academic practice in North and South Carolina. Demographic, comorbidity, diagnostic, stage, initial treatment, and metastatic treatment data were abstracted by retrospective chart review, double-entered and verified for accuracy. Results: Of the first 743 charts screened, 306 were eligible (mean age 61 (SD 13), 49% male; 65% white; 22% black; 77% colon cancer and 19% rectal; stages II 8%, III 16%, IV 64%). 26 earlier stage rectal cancer patients received neoadjuvant treatment, 50% infusional fluorouracil (5FU) and 42% capecitabine (Cap). 46 colon cancer patients received adjuvant CT, including 5FU/leucovorin (LVN; 54%), 5FU/LVN/oxaliplatin (21%), Cap (9%), and 5FU/LVN/irinotecan (7%). First-line CT for metastatic colon cancer (n=149) included FOLFOX+-bevacizumab (Bev; 42%), Cap/oxaliplatin +- Bev (23%), 5FU/LVN + Bev (9%), FOLFIRI +- Bev (7%), IFL +- Bev (7%), clinical trial (7%), Cap (3%), and unknown (1%). 54% of patients received Bev overall, reflecting 49% usage before 6/05 and 69% after 6/05. CT was not offered for 25 (8%) at initial diagnosis. Conclusion: Locoregional practice patterns in the Carolinas suggest that for adjuvant treatment of CRC, oxaliplatin has been used in 21% of adjuvant and 75% of first-line metastatic colon CT regimens, and that bevacizumab use has increased to 69% of first-line metastatic CRC patients.

No significant financial relationships to disclose.

Prevalence of osteoporosis in glioma patients on enzyme inducing anticonvulsants (EIAC) and/or glucocorticoids

19527

Background: Glioma patients are at risk for osteoporosis and associated morbidity as a result of neurological deficits, anticonvulsants and glucocorticoid therapy. The prevalence of osteoporosis in glioma patients has not been reported. We hypothesized that the prevalence of the osteopenia (defined by bone mineral density (BMD) T-score < -1) or osteoporosis (defined by T- score < -2: spine; T-score < - 2.5: femur) in glioma patients supports consideration of bisphosphonate treatment to prevent or reduce the severity of osteoporosis and skeletal complications. Methods: BMD was conducted on 19 eligible patients. Eligibility criteria included: (1) histologically confirmed diagnosis of a primary glioma, (2) age ≥ 18 years, (3) KPS ≥ 60%, (4) treated with valproate or an EIAC and/or on more than physiologic replacement steroid therapy, (5) creatinine < 2.0 mg/dl and calculated creatinine clearance of >60 ml/min, (6) bilirubin < 1.5 x nl, LFTs < 2.5 x nl, (7) recovery from surgery, (8) life expectancy >12 wks, and (9) written informed consent. Exclusion criteria: Previously diagnosed with osteoporosis requiring oral bisphosphonates. Results: 89% were diagnosed with a glioblastoma. Mean age, 54.6 (±SD 9.4; range 35–70). 68% (13/19) were male and all were white race. 53% (10/19) had a KPS of ≥90: 42% (5/19) KPS ≥80: 5% (1/19) KPS ≥70%. AC use: 64% phenytoin; 11% valproate; 5% phenobarbital; 5% oxcarbazepine; 10% levetiracetam; and 5% none. 37% were on dexamethasone, 16% other steroids, and 47% off steroids. Mean N-telopeptide (a marker of bone turn over) was 12.6 (±SD 5.5; range 5.6–22.2). 22% of patients (4/19) had osteopenia and 16% (3/19) had osteoporosis. Conclusions: Overall 38% percent of glioma patients had evidence of osteopenia and 16% had osteoporosis. Thus, bisphosphonates should be considered to prevent skeletal complications. Subsequently, we have initiated an open-labeled Phase II trial to further determine the prevalence of osteoporosis in glioma patients and the effect of every three month prophylactic zoledronic acid on bone density. An update of the prevalence of osteoporosis in patients enrolled on this trial will be presented.

No significant financial relationships to disclose.

Phase II trial of bevacizumab and irinotecan in the treatment of malignant gliomas

2003

Background: Recurrent malignant gliomas have low response rates to current treatments. Malignant gliomas have high concentrations of VEGF receptors which are poor prognostic indicators. Bevacizumab is a humanized IgG1 monoclonal antibody to VEGF, which is synergistic with chemotherapy for most malignancies. Irinotecan is a topoisomerase 1 inhibitor with modest activity against recurrent malignant gliomas. Methods: We report the mature data for our FDA approved phase II trial of bevacizumab and irinotecan for the treatment of recurrent malignant gliomas. We enrolled 68 patients (35 with grade IV tumors and 33 with grade III tumors.) All patients had progressive disease and received prior radiation therapy and temozolomide. The first 32 patients were treated every other week with bevacizumab 10 mg/kg and irinotecan 125 mg/m2 (non EIAED) or 340 mg/m2 (EIAED). The last 36 patients were treated with irinotecan 125 mg/m2 (non EIAED) or 350 mg/m2 (EIAED) on days 1, 8, 22, and 29 and bevacizumab 15 mg/kg on days 1 and 22. Results: The regimen was well tolerated. Only 1 CNS hemorrhage occurred after 10 cycles of treatment. Eight patients were taken off study for thrombotic complications (four PE, two DVT, one TTP, one thrombotic stroke) and 2 of these patients died (one with PE and one with thrombotic stroke). Two patients were discontinued secondary to grade 2 proteinuria and 3 were discontinued because they required non-neurosurgical surgery. The response rate was 59% (38 PRs and 2 CRs). In Grade IV, the median PFS was 23 weeks (95% confidence intervals 17–34). The 6 month PFS was 43% (95% confidence intervals 29%-63%), the median overall survival was 40 weeks (95% confidence intervals 34–50). In grade III patients the median PFS was 42 weeks, the 6 month PFS was 61% (95% confidence intervals 46%-80%), the medial overall survival was 60 weeks (95% confidence intervals 37%-73%). The follow-up for the second cohort is short with similar efficacy and more toxicity. Conclusion: The combination of bevacizumab and irinotecan is safe and demonstrates superior activity against malignant gliomas.

[Table: see text]

Phase I dose escalation, toxicity and dynamic contrast-enhanced (DCE) MRI imaging biomarker study of first line treatment with imatinib (I) and cisplatin (C) plus docetaxel (D) in patients with advanced non-small cell lung cancer (NSCLC)

18056

Background: Imatinib (I) inhibits activated PDGF-Rβ and down-regulates VEGF resulting in decreased angiogenesis and improved blood flow favoring enhanced tumor drug delivery in lung cancer xenoagrafts. Objectives: 1) determine the MTD for the combination of I and C plus D in NSCLC pts, 2) describe non-dose limiting toxicities (non-DLT), 3) evaluate for feasibility and changes in blood flow/permeability measurement by DCE-MRI after treatment with I, and 4) explore the relationship between measured DCE-MRI parameters and proangiogenic plasma tumor markers PDGF-BB, VEGF, PAI1, ANG2, OPN, and MMP1. Methods: Eligibility: NSCLC with tumor expression of p-PDGF-Rβ. DCE-MRI was performed before and after 7 daily doses of I alone (lead-in) followed by C plus D on day 1, every 3 weeks. Once daily I was given with each C plus D cycle, on days -5 to +2. Standardized hemodynamic parameters (Ktrans, Ve, Kep) were acquired from DCE-MRI. Enrolled patients’ plasma was analyzed by ELISA to determine plasma tumor markers’ level. Results: 14 enrolled pts (9 M, 5 F) were evaluable for toxicity and 13 for response. Six pts were treated at dose level 1 (C+D 60/60 mg/m2, and I 300 mg); one DLT (febrile neutropenia) was seen; there were no DLTs in cohort 2 (60/60 mg/m2 and I 400 mg; n=3), and two DLTs were observed in cohort 3 (70/70 mg/m2 and I 400 mg; n=5) - febrile neutropenia and grade 4 diarrhea. For all cohorts, grade 3 and 4 toxicities were: fatigue (7%), nausea (14%), neutropenia (14%), elevated creatinine (7%), and dispnea (7%). Two pts (15%) had partial response, and 6/13 pts had stable disease as their best response. DCE-MRI demonstrated trend in decrease of Ve after 7-day treatment with I (p=0.088). Exploratory analysis revealed a significant correlation of: both ANG2 and OPN with Ve (p=0.02 and 0.05 respectively), MMP1 with Kep (p=0.03), and VEGF with Ktrans (p=0.02). Conclusions: MTD for I and C plus D in chemo naïve NSCLC pts is 400 mg and 60/60 mg/m2, respectively. More, DCE-MRI is feasible in NSCLC pts. Phase II study is open and currently enrolling with continues exploration of DCE-MRI as a predictive imaging biomarker, collectively with tumor proangiogenic markers.

No significant financial relationships to disclose.

Phase II trial of irinotecan/gemcitabine as second-line therapy for relapsed and refractory small-cell lung cancer: Cancer and Leukemia Group B Study 39902

BACKGROUND

This phase II study evaluated the efficacy and safety of the irinotecan/gemcitabine combination in patients with relapsed/refractory small-cell lung cancer (SCLC).

PATIENTS AND METHODS

Patients with measurable tumor who had received one previous chemotherapy or chemotherapy/radiation regimen were eligible. Gemcitabine 1000 mg/m(2) was administered i.v. over 30 min followed immediately by irinotecan 100 mg/m(2) i.v. over 90 min, both on days 1 and 8 every 21 days. Patients were stratified based on response to initial treatment [i.e. primary sensitive disease with progression >or=3 months (group A), or refractory disease (group B)].

RESULTS

Seventy-three patients were enrolled but one never received treatment and one ineligible patient did not have SCLC. Median patient ages of the remaining patients were 61 and 63 years in groups A (n = 35) and B (n = 36), respectively, with performance status of 0 or 1 in 85% of 71 patients. Primary grade 3/4 toxic effects in groups A versus B were neutropenia (36% versus 43%), thrombocytopenia (36% versus 26%), nausea (12% versus 11%), vomiting (0 versus 11%), diarrhea (12% versus 9%), and pulmonary (12% versus 12%). Two patients had fatal events including pneumonitis (n = 1) and acute respiratory distress syndrome (n = 1). Responses occurred in 11 group A [two complete responses and nine partial responses (PRs)] and four group B (all PRs) patients, for response rates of 31% [95% confidence interval (CI) 17%, 49%) and 11% (95% CI 3%, 26%), respectively. Median survival and progression-free survival times were 7.1 (95% CI 6, 10.5) versus 3.5 (95% CI 3.1, 5.7) months, and 3.1 (95% CI 1.6, 5.3) versus 1.6 (95% CI 1.4, 2.8) months for group A versus B.

CONCLUSION

The irinotecan/gemcitabine combination is active and well tolerated as second-line therapy in SCLC patients. Additional studies are warranted as second-line therapy in patients who progressed 90 days or more after first-line therapy. However, the observed efficacy results in refractory SCLC patients indicate that this regimen should not be further explored in this population.

Treatment with Imatinib in NSCLC is associated with decrease of phosphorylated PDGFR-beta and VEGF expression, decrease in interstitial fluid pressure and improvement of oxygenation

Elevated intratumoral interstitial fluid pressure (IFP) and tumour hypoxia are independent predictive factors for poor survival and poor treatment response in cancer patients. However, the relationship between IFP and tumour hypoxia has not yet been clearly established. Preclinical studies have shown that lowering IFP improves treatment response to cytotoxic therapy. Interstitial fluid pressure can be reduced by inhibition of phosphorylated platelet-derived growth factor receptor-β (p-PDGFR-β), a tyrosine kinase receptor frequently overexpressed in cancer stroma, and/or by inhibition of VEGF, a growth factor commonly overexpressed in tumours overexpressing p-PDGFR-β. We hypothesised that Imatinib, a specific PDGFR-β inhibitor will, in addition to p-PDGFR-β inhibition, downregulate VEGF, decrease IFP and improve tumour oxygenation. A549 human lung adenocarcinoma xenografts overexpressing PDGFR-β were grown in nude mice. Tumour-bearing animals were randomised to control and treatment groups (Imatinib 50 mg kg⁻¹ via gavage for 4 days). Interstitial fluid pressure was measured in both groups before and after treatment. EF5, a hypoxia marker, was administered 3 h before being killed. Tumours were sectioned and stained for p-PDGFR-β, VEGF and EF5 binding. Stained sections were viewed with a fluorescence microscope and image analysis was performed. Imatinib treatment resulted in significant reduction of p-PDGFR-β, VEGF and IFP. Tumour oxygenation was also significantly improved. This study shows that p-PDGFR-β-overexpressing tumours can be effectively treated with Imatinib to decrease tumour IFP. Importantly, this is the first study demonstrating that Imatinib treatment improves tumour oxygenation and downregulates tumour VEGF expression.

Bevacizumab, a monoclonal antibody to vascular endothelial growth factor (VEGF), and irinotecan for treatment of malignant gliomas

1506

Background: The prognosis for recurrent malignant gliomas is poor, with a median survival <12 months, median progression-free survival <12 weeks and response rates <20%. Malignant gliomas have high concentrations of VEGF receptors, and the higher the VEGF receptor concentration, the worse the prognosis. Bevacizumab is a humanized IgG1 monoclonal antiblody to VEGF, which is synergistic with chemotherapy for most malignancies. Irinotecan is a topoisomerase 1 inhibitor, and has modest activity against recurrent malignant gliomas. Methods: We report a FDA approved phase II trial of bevacizumab and irinotecan for the treatment of recurrent malignant gliomas. 32 patients were enrolled, 23 with grade IV tumors (glioblastoma multiforme) and 9 with grade III tumors (anaplastic astrocytomas or oligodendrogliomas). All the patients had progressive disease and every patient had received prior radiation therapy and chemotherapy. Patients were treated every other week with bevacizumab 10 mg/kg and irinotecan 125 mg/m2 for patients not taking enzyme inducing anti-epileptic drugs or 340 mg/m2 for patients taking enzyme inducing anti-epileptic drugs. Results: The regimen was well tolerated with no CNS hemorrhages or >grade 1 systemic hemorrhages. Four patients were taken off study for thrombotic complications, 2 pulmonary emboli, 1 deep venous thrombus, and one thrombotic stroke. Two patients were discontinued secondary to grade 2 proteinuria and three were discontinued because they required non-neurosurgical surgery, appendectomy, repair of anal fissures and hip stabilization. The response rate was 63% (19 PRs and 1 CR). The median progression-free survival is 24 weeks. The median overall survival has not been reached, and exceeds 6 months. There have been ten deaths due to disease progression. Conclusions: The combination of bevacizumab and irinotecan is safe and one of the most active regimens against malignant gliomas.

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