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Biomedical subjects

Frederick J Meyers

Publications and source records attributed to Frederick J Meyers.

At least 19 recordsLinked to original sources
PubMed2006

Endoscopic ultrasound-guided celiac plexus neurolysis for pancreatic cancer pain: a single-institution experience and review of the literature.

Pancreatic cancer is a common gastrointestinal malignancy with a poor prognosis. The primary goal for caregivers is effective palliative care, especially pain control, which is routinely managed by administration of narcotic analgesics. An alternative or adjunctive modality is celiac plexus neurolysis (CPN), a safe and effective procedure. Recent advances in the use of endoscopic ultrasonography (EUS) have made it an attractive guidance technique for CPN while allowing for a simultaneous tissue diagnosis. We report our experience using EUS-guided CPN and review the available literature regarding this modality.

Abdominal Pain↗
PubMed2005

The Palliative Care in Assisted Living (PCAL) pilot study: successes, shortfalls, and methodological implications.

Troubling deficits exist in palliative care (PC) of older adults under the prevailing "terminal care"-oriented model. We previously described a PC model--TLC--that provides a blueprint for remedying these shortfalls. In this model, PC is envisioned as Timely and Team-oriented, Longitudinal, and Collaborative and Comprehensive. We present results of the Palliative Care in Assisted Living pilot, comparing two TLC model-based, facility delivered interventions for improving the PC of elderly assisted living residents in Sacramento, California, a growing and under-researched population. The less intensive intervention involved one assessment followed by a PC improvement recommendation letter to the resident, family member, primary provider, and facility staff, while the more intensive intervention involved assessments and letters every three months. Primary outcomes were SF-36 Physical (PCS) and Mental (MCS) Component scores and recommendation adherence. Eighty-one subjects enrolled (mean age 85), 58 in the more and 23 in the less intensive group. A loved one attended 56% of baseline assessments. Most subjects expressed a preference for maintaining current quality of life over prolonging life at reduced quality. None were eligible for hospice care. A total of 418 recommendations (mean 5.1 per subject) were generated concerning symptoms, mood, functional impairments, and advance directives. We found no significant differences in recommendation adherence between more (42%) and less (44%) intensive groups, and no significant changes in PCS and MCS scores within or between groups. However, a loved one's attendance of the baseline assessment was associated with improved PCS scores (p=0.04). Our pilot study had methodological limitations that could account for the lack of significant outcome effects. In this context, and given the myriad unmet PC needs we detected, interventions based on the TLC model might allow delivery of timely PC to assisted living residents not eligible for hospice care. Further studies exploring the TLC model appear warranted.

Advance Care Planning↗
PubMed2005

An approach to develop effective health care decision making for women in prison.

BACKGROUND: Decision making about medical treatment, advance care planning and end-of-life care often is limited or influenced by a patient's capacity to read or comprehend crucial information. Ineffective communication between patient and physician, and the complex nature of serious illness and dying also affect these decisions. America's incarcerated have virtually no autonomy in decision making, especially with regard to medical care and treatment. For the nearly 100,000 incarcerated women in the United States, medical issues differ significantly from those of male prisoners. Many women enter prison with chronic illnesses or are diagnosed with such illnesses while in prison. In addition, America's prison population reflects our country's unsolved literacy problems with almost two thirds of aging inmates lacking basic literacy skills. Maintaining a balance between the Eighth Amendment rights of prisoners and their status as wards of the state is a concern for inmates and for those responsible for their care. OBJECTIVE: The purpose of this study was to identify informational barriers to people making medical care and treatment decisions, particularly those with low literacy. Findings were used to in the development of a tool to assist patients to initiate discussion and become active participants in their own care. DESIGN: Female inmates of diverse ethnicity and literacy levels were recruited through self-selection from the Central California Women's Facility near Sacramento to participate in focus group discussions. The focus groups were guided by a set of research questions and were facilitated by the first author to identify informational barriers to medical care needs. SETTING: The female prison setting was identified as an appropriate setting for the development of a new approach to stimulate effective decision making by introducing basic information on medical care and treatment, advance care planning, and end-of-life care. A total of 113 inmates participated in 16 focus group, each 2 hours in length. RESULTS: Findings were used to develop a handbook to assist low literacy populations in general, and female inmates in particular, to obtain appropriate medical care and treatment and to make advance care decisions regarding the end of life. CONCLUSION: Those who face chronic, potentially life-limiting illness cannot make meaningful decisions regarding medical care and treatment without having a basic foundation of health information. Acquiring knowledge and improving communication skills reduce stress and vulnerability, assuring individuals of some control over decision making.

Communication Barriers↗
PubMed2005

Medical and surgical palliative care of patients with urological malignancies.

PURPOSE: Urological malignancies are relatively common and patients often live many years with disease. There are many effective medical and surgical palliative treatments, although few comprehensive guidelines have been published. We reviewed the various palliative treatments available for the 3 most common urological malignancies, namely prostate cancer, bladder cancer and renal cancer. MATERIALS AND METHODS: A literature search of the last 15 years was performed using MEDLINE/PubMed. In addition, relevant journals were targeted for specific information related to this review. Our clinical experience was combined with the current literature to create guidelines for palliative care. RESULTS: Several effective treatments are available for the palliative care of patients with prostate, bladder or renal cancer. Options in palliative care are varied with regard to invasiveness, morbidity, risks and benefits. The algorithms described provide a framework to a sequential approach to achieving palliation. Urologists are central to initiating care and referrals to improve outcomes in these patients. CONCLUSIONS: Palliative care includes disease directed treatment as well as functional, psychosocial and spiritual support. Disease directed therapy and palliative care should be provided simultaneously throughout illness. Improved quality of care and quality of life as well as physician satisfaction are frequent outcomes of this approach. Supportive care begins at initial diagnosis and it should be flexible to meet the changing needs of patients with cancer and their families.

Algorithms↗
PubMed2004

Trastuzumab plus docetaxel in HER-2/neu-positive prostate carcinoma: final results from the California Cancer Consortium Screening and Phase II Trial.

BACKGROUND: Overexpression of the HER-2/neu oncoprotein has been reported to occur in </= 60% of patients with prostate carcinoma and to correlate with shortened survival. Trastuzumab is a humanized monoclonal antibody to the HER-2 receptor and has activity against HER-2-positive breast carcinoma, more so when combined with a taxane. The authors screened for HER-2 overexpression in patients developing hormone-refractory prostate carcinoma (HRPC) and conducted a Phase II trial of trastuzumab plus docetaxel in HER-2-positive patients. METHODS: Paraffin-embedded tumor specimens from potentially eligible patients were screened for HER-2 expression by immunohistochemistry (IHC) and/or amplification by fluorescent in situ hybridization (FISH). Shed HER-2 was also assessed by enzyme-linked immunoradsorbent assay (ELISA). Patients with HER-2-positive tumor specimens (IHC 2+ or 3+ or FISH ratio > 2) were initially randomized to receive either single-agent trastuzumab or docetaxel. After two treatment cycles, nonresponding patients received the trastuzumab/docetaxel combination. Treatment was comprised of 30 mg/m(2) of docetaxel weekly for 6 weeks followed by a 2-week break and 4 mg/kg of trastuzumab intravenously during Week 1 then 2 mg/kg per week thereafter. The cycle length was 8 weeks. RESULTS: One hundred patients with HPRC were screened. IHC results were as follows: 3+ (n = 1), 2+ (n = 6), 1+ (n = 26), 0 (n = 39), and insufficient tissue specimen/not tested (n = 28). Only 3 of 37 patients had elevated shed HER-2 by ELISA (> 15 mg/mL). None overexpressed HER-2 by IHC. FISH amplification was found in 0 of 34 tissue samples. Of seven patients with IHC 3+ or 2+, four were tested by ELISA and two by FISH. None were abnormal. Age and Gleason score did not correlate with IHC status. Of the seven patients eligible for the Phase II study, only four agreed to participate. The trial was thus closed for nonfeasibility (the overall HER-2 positivity rate was < 20%). No patient responded to trastuzumab alone. The median survival was not reached and the median progression-free survival was 7 months. CONCLUSIONS: HER-2 overexpression by IHC in archival prostate carcinoma specimens was infrequent. There was no apparent correlation among IHC, ELISA, and FISH, although the sample size was limited. Conclusions regarding the predictive value of HER-2 status on outcome after trastuzumab-based therapy were not reached and were only drawn after larger-scale screening efforts. The authors estimated that 1000 patients need to be screened to complete accrual to a 40-patient efficacy trial.

Aged↗
PubMed2004

Adjuvant therapy of osteosarcoma--A Phase II trial: Southwest Oncology Group study 9139.

BACKGROUND: The objective of this study was to estimate the time to treatment failure and survival rate of the three-drug combination of doxorubicin, cisplatin, and ifosfamide as primary and postoperative, adjunctive treatment for teenagers and adults with osteosarcoma (OS). METHODS: Sixty-three eligible patients with nonmetastatic OS of the extremities were registered from 24 institutions from February, 1992 through December, 1996. Chemotherapy was comprised of doxorubicin at a dose of 75 mg/m2 and cisplatin at a dose of 120 mg/m2, alternating with doxorubicin at a dose of 50 mg/m2 and ifosfamide at a dose of 8 g/m2. Four cycles were given prior to surgical resection, and four cycles were given after surgery. Outcome measures included the time to treatment failure, overall survival, toxicity, and centralized assessment of tumor necrosis. RESULTS: Thirty-one of 63 eligible patients died, for a 5-year overall survival rate of 58% (95% confidence interval [95% CI], 46-71%). The median time to treatment failure was 19 months (95% CI, 12-41 months). A good pathologic response (> or = 90% necrosis) to neoadjuvant chemotherapy was observed in 48% of patients who underwent surgery. There was no correlation noted between response to neoadjuvant chemotherapy and patient outcome. Grade 4 hematologic toxicities were frequent (89%), although serious nonhematologic toxicities other than nausea and emesis were uncommon. CONCLUSIONS: The regimen and schedule used in the current study did not improve outcomes compared with prior trials of doxorubicin and cisplatin alone. New, more effective drugs are needed for the treatment of patients with OS. The identification and utilization of molecular markers to predict outcome and response to therapy would facilitate clinical management, limiting exposure to toxic therapies for patients with favorable molecular profiles and identifying those patients who may fail with current approaches as candidates for clinical trials.

Adolescent↗
PubMed2004

Platinum-free combination chemotherapy in patients with advanced or metastatic transitional cell carcinoma.

BACKGROUND: Platinum-based regimens have improved response rates and survival in patients with advanced transitional cell carcinoma (TCC) of the urothelial tract. However, the toxicities of platinum-based chemotherapy are considerable. Regimens with reduced toxicity that are applicable to a broader group of TCC patients without sacrificing activity therefore are of interest. METHODS: Because gemcitabine, paclitaxel, and methotrexate have each been reported to possess single-agent activity in this disease, the authors evaluated the tolerability and efficacy of fixed doses of paclitaxel (100 mg/m(2) over 3 hours) and methotrexate (30 mg/m(2)) with escalating doses of gemcitabine (800-1000 mg/m(2)), all given on Days 1 and 8 every 21 days, in patients with previously untreated unresectable or metastatic TCC. RESULTS: Twenty-five patients were enrolled. Two patients were ineligible and were excluded from analysis. Because no dose-limiting toxicity occurred in the first 4 patients who were given gemcitabine at a dose of 800 mg/m(2), the gemcitabine dose was escalated to 1000 mg/m(2) in the next 21 patients. Of the 21 patients assessable for response, 6 had achieved a complete response (CR) and 6 had achieved a partial response, for an overall response rate of 57%. An additional patient was converted to a CR surgically. The median overall and progression-free survival times were 18 months and 9.2 months, respectively. Toxicity was predominantly neutropenia: Grade 3 in 9 patients (39%) and Grade 4 in 4 patients (17%) (according to the Southwest Oncology Group Toxicity Criteria, version 12/1994). One patient died of septic shock associated with febrile neutropenia after three cycles. CONCLUSIONS: The regimen of gemcitabine, paclitaxel, and methotrexate at this dose and schedule was found to possess activity in patients with locally advanced or metastatic TCC. Further studies of this regimen are warranted.

Adult↗
PubMed2004

Simultaneous care: a model approach to the perceived conflict between investigational therapy and palliative care.

Clinical trials of investigational therapy in patients with advanced cancer may not pay sufficient attention to quality of life (QOL) and supportive care issues, resulting in an adverse impact on the quality of care (QOC). We hypothesized that the simultaneous delivery of investigational therapy and a structured program of supportive care would result in measurable improvements in predefined outcomes without adverse events for patients, caregivers, or the physician/patient interaction. This report describes the findings of a trial designed to test the feasibility and initial results of such an approach. Forty-four patients accrued to Phase I or Phase II investigational therapy trials were simultaneously enrolled into a defined home care program focused on supportive care needs of the patient and family, as well as assessment of the toxicities of investigational therapy. These 44 patients constitute the Simultaneous Care (SC) cohort. Twenty patients receiving investigational therapy and the standard supportive care measures available through the Cancer Center served as a control group, designated the Usual Care (UC) cohort. We measured QOL using baseline and monthly assessments of the Functional Assessment of Cancer Therapy (FACT-G) instrument. This instrument measures four domains of well-being: physical, emotional, functional, and social/family. We prospectively defined QOC as: the percentage of hospice referrals; hospice length of stay; and number of cycles of chemotherapy administered. A summary score for the four FACT domains at each time point for each patient was calculated (FACT 4). The FACT 4 scores of the SC group improved compared to the UC group but did not reach a significant difference. Individual scores reflected a wide range of psychometric variability. A statistically significant difference in referral to hospice was seen in the SC group (35/44) compared to the UC group (8/15) (P=0.034). The median length of stay in hospice was the same for both cohorts but the mean stay was greater in the SC cohort (54 days) compared to the UC cohort (37 days). The mean number of chemotherapy cycles was not different between SC and UC (P=0.25). The self-reported acceptance by patients, caregivers, physicians and Cancer Center support staff was qualitatively excellent. Patients with advanced cancer at the time of enrollment onto investigational therapy should have made an explicit transition to palliative care goals but often have not. In the current health care environment, patients with advanced cancer without curative potential may be forced by their health provider or health insurer to choose between disease-directed therapy (including investigational therapy) or structured best supportive care programs. In this emerging era of targeted therapies, SC provides an approach designed to optimize palliative care goals while supporting the clinical research mission of offering patients with advanced cancer new and potentially better therapeutic interventions. SC is a system of care that enhances patient choice by allowing patients and families to have concurrent access to two beneficial options. SC may enhance coordination of care and facilitate patients' explicit transition from curative intent to palliative intent. In order to validate this approach, a randomized comparative trial evaluating SC has been initiated.

Adult↗
PubMed2003

SU5416 plus interferon alpha in advanced renal cell carcinoma: a phase II California Cancer Consortium Study with biological and imaging correlates of angiogenesis inhibition.

PURPOSE: Vascular endothelial growth factor (VEGF) is expressed in up to 70% of renal cell carcinomas (RCCs) and is a rational therapeutic target. SU5416 is a small molecule inhibitor of VEGF-mediated signaling through Flk-1, a transmembrane tyrosine kinase. IFN-alpha also possesses dose- and schedule-dependent antiangiogenic effects at doses lower than those used for RCC therapy. We hypothesized that SU5416 plus low dose IFN-alpha 2B (Intron-A) would result in a 1-year event-free survival (EFS), exceeding 20% in patients with metastatic RCC using the results of a randomized immunotherapy trial as historical control. Efficacy was correlated with serial plasma VEGF and plasminogen activator inhibitor-1 levels and with positron emission tomography scans. EXPERIMENTAL DESIGN: Thirty patients were treated with SU5416 145 mg/m(2) i.v. twice weekly plus Intron-A 1 million units s.c. twice daily, cycled every 6 weeks. RESULTS: Fifteen patients (50%) had stable disease (SD) at 12 weeks, including 1 minor response and 8 with progressive disease (27%). Median survival time was 10 months, and 1-year EFS was 6% (95% confidence interval, 1-35). The most common grade 3 or 4 toxicities included fatigue and lymphopenia, among others. There were 3 on-study deaths, 2 of which were infection-related. Significant declines in median plasma levels of VEGF pre- and posttherapy were observed. In 5 patients with paired FDG and O-15 positron emission tomography scans, tumor metabolism and perfusion were unchanged in 3 patients with SD, increased in 1 patient with progression, and decreased in 1 patient with SD. CONCLUSIONS: Although SU5146 plus low-dose IFN exhibits biological activity in RCC as evidenced by significant declines in serial VEGF and plasminogen activator inhibitor-1 plasma levels, the 1-year EFS of 6% and adverse toxicity profile diminishes enthusiasm for additional studies with this combination in advanced RCC.

Adult↗
PubMed2003

Current strategies in the management of hormone refractory prostate cancer.

Prostate cancer is the most common cancer diagnosed in American males, and is the second leading cause of cancer-related deaths. Most patients who develop metastatic disease will initially respond to androgen deprivation, but response is invariably temporary. Most patients will develop androgen-independent ("hormone-refractory") disease that results in progressive clinical deterioration and ultimately death. This progression to androgen independence is accompanied by increasingly evident DNA instability and alterations in genes and gene expression, including mutations in p53, over-expression of Bcl2, and mutations in the androgen receptor gene, among others. Treatment options for hormone refractory disease include intensive supportive care, radiotherapy, bisphosphonates, second-line hormonal manipulations, cytotoxic chemotherapy and investigational agents. A post-treatment reduction in the level of prostate specific antigen (PSA) by 50% has been shown to correlate with survival and has been accepted by consensus as a valid endpoint in clinical trials. Chemotherapeutic agents such as mitoxantrone, estramustine, and the taxanes have yielded improved response rates and palliative benefit, but not improved survival. Therefore, current efforts must be focused on enrolling patients onto clinical trials of investigational agents with novel mechanisms of action, and on using survival, time to progression, and quality of life as end points in routine clinical practice.

Antineoplastic Agents↗
PubMed2003

Population-based maximum tolerated dose of irinotecan and carboplatin.

A novel schema of intrapatient dose escalation was applied to determine a population-based maximum tolerated dose (pMTD) for irinotecan (CPT-11, Camptosar) and carboplatin (Paraplatin) in a phase I trial. A total of 74 patients with advanced solid tumors were enrolled with the following characteristics: men/women, 46/28; median age, 61 years; 51 patients with and 23 patients without prior chemotherapy; performance status of 0-1 (93%) and 2 (7%). Patients were started at dose level 1 with irinotecan at 200 mg/m2, and carboplatin at an area under the concentration-time curve (AUC) of 5 mg/mL x min, administered every 21 days. Depending on degree of toxicity observed, the dose for each patient in each subsequent cycle was determined according to a predetermined schema of dose levels. Individual maximum tolerated dose (iMTD) was determined for each patient. The pMTD was defined as the highest dose level for which the incidence of dose-limiting toxicity occurred in less than 33% of the patient population. The most common dose-limiting toxicity included neutropenia (58%), thrombocytopenia (15%), diarrhea (8%), and nausea/emesis (7%). The iMTD ranged from dose level-3 (irinotecan at 100 mg/m2 and carboplatin at an AUC of 4) to dose level 5 (irinotecan at 350 mg/m2 and carboplatin at AUC 6). The pMTD was determined to be dose level-1 and 1 for previously chemotherapy-treated and--untreated patients, respectively. Fifty-nine patients were assessable for response. Of note, a response rate of 40% was observed in 15 patients with relapsed small-cell lung cancer previously treated with platinum-based therapy. We recommend dose level 1 of irinotecan (200 mg/m2) and carboplatin (AUC 5) for chemotherapynaive patients, and dose level-1 of irinotecan (150 mg/m2) and carboplatin (AUC 5) for chemotherapy-treated patients in phase II trials.

Adult↗
PubMed2002

Does HER2/neu expression provide prognostic information in patients with advanced urothelial carcinoma?

BACKGROUND: Muscle-invasive urothelial carcinoma of the bladder is a highly lethal malignancy, particularly in the setting of locally advanced or metastatic disease. Prior reports of HER2/neu (c-erbB-2 or HER2) expression in bladder carcinoma have been mixed; therefore, its value in predicting metastasis or response to therapy has not been established in this tumor type. Thus, the authors evaluated a possible correlation between HER2 expression in patients with high-grade, muscle-invasive urothelial carcinoma of the bladder and outcome in patients who received paclitaxel-based chemotherapy. METHODS: Archival tumor tissues from patients with advanced urothelial carcinoma who were enrolled on two clinical trials of paclitaxel-based chemotherapy regimens were analyzed for HER2/neu expression by immunohistochemistry (IHC). The authors correlated HER2 expression by IHC with clinical outcomes, such as response rate, progression free survival, and overall survival, using univariate analysis. RESULTS: Thirty-nine tumor specimens were assessed for HER2 expression, most of which (70%) were collected from patients with metastatic disease. All were high-grade urothelial carcinomas (transitional cell carcinomas, Grade 3). Strong HER2 expression (2+/3+) was seen in 28 patients (71%). Patients with responding disease had an HER2 expression rate of 78%, similar to the rate seen in patients with stable disease (75%). In contrast, patients with progressive disease had an HER2 expression rate of 50%, although this difference did not reach statistical significance. However, univariate analysis showed that increased HER2 expression predicted an improvement in progression free and overall survival. When HER2 status was used as a dichotomous variable, tumors with positive HER2 expression did not have any association with response or with progression free survival; however, positive HER2 status was associated significantly with a decreased risk of death (P = 0.03). CONCLUSIONS: This study of HER2 expression in bladder carcinoma focused on patients who were treated prospectively in a standardized fashion, unlike prior studies that have evaluated banked, archival specimens. The authors confirmed the findings of others that high-grade, muscle-invasive urothelial carcinoma of the bladder has a significant rate of HER2 expression (71%). However, contrary to other reports, the current study found that HER2 expression in the context of paclitaxel-based chemotherapy decreased the risk of death significantly. Further research is warranted on the possible association of HER2 expression with chemosensitivitiy in urothelial carcinoma as well as the efficacy of HER2-targeted therapies (such as trastuzumab) for patients with high-grade, muscle-invasive urothelial carcinoma of the bladder.

Adult↗