Heterozygous ATM mutations do not contribute to early onset of breast cancer.

Ataxia telangiectasia (AT) is a recessive syndrome, including cerebellar degeneration, immunologic defects and cancer predisposition, attributed to mutations in the recently isolated ATM (ataxia telangiectasia, mutated) gene. AT is diagnosed in 1/40,000 to 1/100,000 live births, with carriers calculated to comprise approximately 1% of the population. Studies of AT families have suggested that female relatives presumed to be carriers have a 5 to 8-fold increased risk for developing breast cancer, raising the possibility that germline ATM mutations may account for approximately 5% of all breast cancer cases. The increased risk for breast cancer reported for AT family members has been most evident among younger women, leading to an age-specific relative risk model predicting that 8% of breast cancer in women under age 40 arises in AT carriers, compared with 2% of cases between 40-59 years. To test this hypothesis, we undertook a germ-line mutational analysis of the ATM gene in a population of women with early onset of breast cancer, using a protein truncation (PTT) assay to detect chain-terminating mutations, which account for 90% of mutations identified in children with AT. We detected a heterozygous ATM mutation in 2/202 (1%) controls, consistent with the frequency of AT carriers predicted from epidemiologic studies. ATM mutations were present in only 2/401 (0.5%) women with early onset of breast cancer (P = 0.6). We conclude that heterozygous ATM mutations do not confer genetic predisposition to early onset of breast cancer.

Real world patterns of care in HER2-overexpressing breast cancer: Results of a survey of TEACH clinical trial investigators in 2011.

BACKGROUND: HER2-overexpressing breast cancer (BC) is common among young patients and poses a public health burden. Adjuvant anti-HER2/neu therapy with trastuzumab reduces the risk of recurrence and improves survival. METHODS: A web-based survey was sent to 386 physicians of the "TEACH" trial in 2011 to determine access to HER2/neu testing and treatment patterns for HER2-overexpressing BC. RESULTS: There were 151 responders (39%) from 28 countries. Ninety-seven percent reported HER2/neu expression is routinely measured in their institutions by immunohistochemistry (85%), FISH (80%) and other methods (16%). Twenty percent of responders from Asia reported that the test was not routinely available. Forty-eight percent of participants reported instances when adjuvant HER2-directed therapy was recommended to a patient who eventually did not receive it. Reasons for not receiving trastuzumab was cost (73%, p < 0.0001) in low- and middle-income countries and co-morbidities in high-income countries (43%, p = 0.003). CONCLUSIONS: This survey reflects the availability of HER2/neu testing and anti-HER2/neu therapy among physicians who participated in TEACH. A high proportion of women with HER2-overexpressing BC may not receive standard adjuvant therapy due to unavailability of the test and cost of therapy. Despite having some limitations, such as a possible selection bias of participating physicians, variable definitions of access to healthcare among respondents, and changes in trastuzumab availability since 2011, our results demonstrate that access to care and region of practice impact the implementation of cancer treatments.

Justification for evaluating new anticancer drugs in selected untreated patients with extensive-stage small-cell lung cancer: an Eastern Cooperative Oncology Group randomized study.

BACKGROUND: Studies have shown that response to a given chemotherapy in previously untreated patients with extensive-stage small-cell lung cancer is superior to that in patients previously treated with other regimens. This finding raises the question of whether it is necessary and ethical to study the effects of new anticancer agents in untreated patients. Such studies appear to be the best test for drug development, but there has been no evaluation of whether survival of untreated patients, whose cancer is sensitive to established drugs, is adversely affected in trials of new drugs. PURPOSE: This randomized study of untreated patients with extensive-stage small-cell lung cancer was designed (a) to compare the survival of patients treated with either effective standard chemotherapy or an investigational anticancer drug as initial therapy and (b) to evaluate response rates and toxic effects of such therapies. METHODS: Eighty-six patients were randomly assigned to receive, as initial therapy, either the standard CAV regimen--cyclophosphamide (1000 mg/m2), doxorubicin (50 mg/m2), and vincristine (1.4 mg/m2) every 3 weeks--or the phase II drug menogaril (200 mg/m2) every 4 weeks. Treatment after induction therapy varied, depending on patient response, but nonresponders and those with disease progression received salvage chemotherapy--etoposide (120 mg/m2 on days 1, 2, and 3) and cisplatin (60 mg/m2 on day 1), repeated every 3 weeks. RESULTS: Of the 43 patients on CAV, 42% responded (eight complete responses and 10 partial responses); 5% of the 43 on menogaril responded (two partial responses) (P = .0001). Twelve (22%) of 54 patients responded to salvage chemotherapy (five complete responses and seven partial responses). Within 3 months from start of treatment, twelve patients died--3 patients in the CAV group and nine patients in the menogaril group (P = .12). The estimated median survival was 37 weeks with menogaril and 45 weeks with CAV (P = .28). At 6 months, survival was 76.7% for the CAV group and 67.4% for the menogaril group. At 12 months, survival rates were 24.4% and 27.9%, respectively. Confidence intervals (95%) for the differences between the proportions surviving in the two groups were -9%-28% at 6 months and -25%-14% at 12 months. Use of CAV resulted in significantly higher occurrence of severe and life-threatening treatment-related complications (P = .002). CONCLUSION: The confidence intervals for the differences in survival are too wide to conclude that evaluation of a new drug in untreated patients with extensive-stage small-cell lung cancer is or is not harmful. The data do suggest, however, that use of this study design may have no adverse effect on survival.

Specific genetic predictors of chemotherapeutic response and survival in patients with anaplastic oligodendrogliomas.

BACKGROUND/METHODS: Gliomas are common malignant neoplasms of the central nervous system. Among the major subtypes of gliomas, oligodendrogliomas are distinguished by their remarkable sensitivity to chemotherapy, with approximately two thirds of anaplastic (malignant) oligodendrogliomas responding dramatically to combination treatment with procarbazine, lomustine, and vincristine (termed PCV). Unfortunately, no clinical or pathologic feature of these tumors allows accurate prediction of their response to chemotherapy. Anaplastic oligodendrogliomas also are distinguished by a unique constellation of molecular genetic alterations, including coincident loss of chromosomal arms 1p and 19q in 50%-70% of tumors. We have hypothesized that these or other specific genetic changes might predict the response to chemotherapy and prognosis in patients with anaplastic oligodendrogliomas. Therefore, we have analyzed molecular genetic alterations involving chromosomes 1p, 10q, and 19q and the TP53 (on chromosome 17p) and CDKN2A (on chromosome 9p) genes, in addition to clinicopathologic features in 39 patients with anaplastic oligodendrogliomas for whom chemotherapeutic response and survival could be assessed. RESULTS/CONCLUSIONS: Allelic loss (or loss of heterozygosity) of chromosome 1p is a statistically significant predictor of chemosensitivity, and combined loss involving chromosomes 1p and 19q is statistically significantly associated with both chemosensitivity and longer recurrence-free survival after chemotherapy. Moreover, in both univariate and multivariate analyses, losses involving both chromosomes 1p and 19q were strongly associated with longer overall survival, whereas CDKN2A gene deletions and ring enhancement (i.e., contrast enhancement forming a rim around the tumor) on neuroimaging were associated with a significantly worse prognosis. The inverse relationship between CDKN2A gene deletions and losses of chromosomes 1p and 19q further implies that these differential clinical behaviors reflect two independent genetic subtypes of anaplastic oligodendroglioma. These results suggest that molecular genetic analysis may aid therapeutic decisions and predict outcome in patients with anaplastic oligodendrogliomas.

Chemotherapy for metastatic non-small-cell bronchogenic carcinoma: EST 2575, generation V--a randomized comparison of four cisplatin-containing regimens.

Between December 1979, and October 1981, the Eastern Cooperative Oncology Group (ECOG) compared four cisplatin-containing regimens in the treatment of patients with metastatic non-small-cell bronchogenic carcinoma (NSCBC). CBP (cyclophosphamide, bleomycin, and cisplatin) and AFP (doxorubicin, 5-fluorouracil, and cisplatin) had shown activity in generation II of this study (EST 2575). These were compared to MVP (mitomycin C, vinblastine, and cisplatin) and CAP (cyclophosphamide, doxorubicin, and cisplatin) which were reported efficacious in single institution studies. A total of 479 previously untreated patients with metastatic NSCBC (ECOG performance status 0, 1, or 2) were entered, and of these, 432 (90%) were evaluable. Although MVP resulted in a higher response rate (5 complete responses [CRs], 22 partial responses [PRs], 26% overall) than CBP (4 CRs, 18 PRs, 20% overall), AFP (0 CRs, 18 PRs, 17% overall), or CAP (1 CR, 23 PRs, 23% overall), the difference was not significant. Survival by treatment did not differ significantly. There were 45 life-threatening and six lethal complications of therapy. Although each of the above regimens offers a modest chance of inducing greater than 50% tumor shrinkage (17% to 26%, 21% overall) the effect that these responses have an overall median survival (21.6 to 23.7 weeks, 22.9 weeks overall) is unclear.

Long-term survivors in metastatic non-small-cell lung cancer: an Eastern Cooperative Oncology Group Study.

Between December 1979 and June 1983 the Eastern Cooperative Oncology Group (ECOG) treated 893 good-performance status patients with metastatic non-small-cell lung cancer (NSCLC) on one of seven phase III combination chemotherapies. The overall median survival was 23.5 weeks with no significant differences between treatments. One hundred sixty-eight patients (19%) survived greater than 1 year and 36 (4%) for greater than 2 years. The etoposide-platinum combination had the highest proportion of 1-year survivors (25%). Mitomycin-vinblastine-platinum (MVP), which had demonstrated the highest response rate, had significantly fewer 1-year survivors (12%) than any other regimen (P = .003). Analysis of pretreatment characteristics that distinguished patients who survived greater than 1 year from those who did not demonstrated that an initial performance status of 0, no bone metastases, female sex, no subcutaneous metastases, non-large-cell histology, less than 5% prior weight loss, no symptoms of shoulder or arm pain, and no liver metastases were predictors of longer survival. Of particular interest was the finding that response duration was significantly longer (P = .002) for those patients who experienced a longer time to best response. In addition, patients who survived greater than 1 year experienced greater degrees of nonlethal toxicity, in particular, gastrointestinal and hematologic, than patients who did not survive 1 year, (P = .006). A detailed chart review of 32 2-year survivors and 32 matched controls demonstrated that maintenance or improvement of performance status and maintenance of serum albumin levels at 3 months from the initiation of treatment were both important predictors of longer survival.

Phase II study of paclitaxel in patients with extensive-disease small-cell lung cancer: an Eastern Cooperative Oncology Group study.

PURPOSE: To evaluate the efficacy and safety of paclitaxel (Taxol; Bristol-Myers Squibb Co, Princeton, NJ), a novel diterpene plant product in the treatment of previously untreated patients with extensive-disease small-cell lung cancer (SCLC). PATIENTS AND METHODS: Patients with extensive-disease SCLC received paclitaxel 250 mg/m2 intravenously over 24 hours every 3 weeks. Nonresponders or partial responders, who received the maximum number of cycles (n = 4) of paclitaxel received salvage chemotherapy that consisted of etoposide (VP-16) 120 mg/m2 intravenously over 45 minutes on days 1, 2, and 3, and cisplatin 60 mg/m2 intravenously as a short infusion on day 1. Cycles were repeated every 3 weeks. RESULTS: Of 36 patients entered onto the study, 34 and 32 patients were assessable for toxicity and response, respectively. No complete responses (CRs) were observed. Eleven patients (34%) had a partial response (PR) and six (19%) had stable disease (SD). In three of six patients categorized as having SD, there was greater than 50% tumor shrinkage. However, no 4-week follow-up measurements were made, so these could not be considered PRs, in part because patients received salvage chemotherapy by study design. In this trial, induction and salvage chemotherapy resulted in a response (two CRs and 15 PRs) (53%) in 17 patients. The estimated median survival duration was 43 weeks. Dose-limiting toxicity was leukopenia, with 19 patients (56%) having grade 4 leukopenia. The numbers of patients who experienced other grade 4 toxicities were as follows: pulmonary, three (9%); liver, two (6%); cardiac, one (3%); thrombocytopenia, one (3%); metabolic, one (3%); stomatitis, one (3%); and allergic reaction, one (3%). Four additional patients had grade 3 leukopenia and one patient (3%) died of sepsis (grade 5 toxicity). CONCLUSION: Paclitaxel is an active new agent in the treatment of SCLC. Further investigation of this agent in combination with other active agents is appropriate.

Randomized prospective comparison of intraventricular methotrexate and thiotepa in patients with previously untreated neoplastic meningitis. Eastern Cooperative Oncology Group.

PURPOSE: This prospective randomized cooperative group study was conducted in patients with neoplastic meningitis treated with intrathecal methotrexate or thiotepa to assess response rates and survival, prognostic factors, and the toxicity of these regimens. PATIENTS AND METHODS: Fifty-nine adults with nonleukemic malignancies, performance status of 0 to 3, and positive CSF cytologies were assigned to receive intrathecal methotrexate (10 mg) or thiotepa (10 mg) twice weekly. Radiation, was administered to mass lesions and/or symptomatic sites and appropriate systemic therapy was given concomitantly. RESULTS: Fifty-two patients were assessable. Most were female (79%), nonambulatory (77%), had been pretreated with radiation (52%) and chemotherapy (77%), and had evidence of systemic disease (65%). Most primary cancers were of the breast (48%), lung (23%), or lymphatics (19%). Treatment arms were well balanced, except that more patients randomized to methotrexate had breast cancer (61% v 33%) and were without evidence of systemic cancer (21% v 4%). No patient had important neurologic improvement with therapy, and 75% deteriorated neurologically within 8 weeks of initiating therapy. Survival ranged from 4 days to 110.5+ weeks. Median survival for patients receiving methotrexate was 15.9 weeks and 14.1 weeks for patients treated with thiotepa. Factors predictive of shorter survival included progressive systemic disease (P = .0005), poor performance status (P = .03), and significant cranial nerve palsies (P = .02). Although serious toxicities were similar, mucositis (P = .04) and neurologic complications (P = .008) were more common in patients who received methotrexate. CONCLUSION: The efficacy and overall toxicities of intraventricular methotrexate and thiotepa seem similar and neither reverses fixed neurologic deficits. Early diagnosis and treatment and new therapeutic approaches are needed to improve the outcome for patients with neoplastic meningitis.

Combination chemotherapy versus single agents followed by combination chemotherapy in stage IV non-small-cell lung cancer: a study of the Eastern Cooperative Oncology Group.

During the last decade, the Eastern Cooperative Oncology Group (ECOG) has studied a series of combination chemotherapy regimens in metastatic (stage IV) non-small-cell lung cancer (NSCLC). In January 1984, the ECOG activated a randomized study, EST 1583, which concluded the evaluation of combination regimens in phase III trials and initiated the evaluation of single agents exclusively in previously untreated patients. The treatment regimens in EST 1583 consisted of: (1) mitomycin, vinblastine, and cisplatin (MVP); (2) vinblastine and cisplatin (VP); (3) MVP alternating with the regimen cyclophosphamide, doxorubicin, methotrexate, and procarbazine (CAMP); (4) carboplatin followed by the MVP regimen at the time of progression; and (5) iproplatin followed by MVP at the time of progression. From January 1984 to July 1985, 743 patients were entered on this trial and 699 fulfilled the eligibility requirements. The following objective response rates (complete plus partial remissions) were observed: first-line MVP, 20%; VP, 13%; MVP/CAMP, 13%; carboplatin, 9%; iproplatin, 6%; and second-line MVP, 6%. First-line MVP produced a significantly higher response rate than the other treatments (P = .03) adjusted for prognostic variables. Using analyses that were adjusted for prognostic covariates, survival for patients treated on a given regimen was compared with survival for all remaining patients. These analyses showed that treatment with carboplatin was associated with longer survival (median survival time, 31.7 weeks; P = .008) while initial treatment with MVP was associated with a trend for shorter survival (median survival time, 22.7 weeks; P = .09). It should be noted that none of these regimens appear to have produced a clinically meaningful prolongation of survival. Similar analyses evaluating time to progression disclosed that carboplatin-treated patients had a significantly longer time to progression (median time to progression, 29 weeks) than all remaining patients (P = .01). Life-threatening and lethal toxicities (toxicity grades 4 and 5) were greater on the combination regimens than on the single agents (P less than .0001). Based on these results, current group-wide ECOG trials in stage IV NSCLC consist of randomized phase II trials evaluating single agents.

A randomized trial of the four most active regimens for metastatic non-small-cell lung cancer.

Between October 1981 and June 1983, the Eastern Cooperative Oncology Group (ECOG) conducted a prospectively randomized trial (EST 1581) of the four most active chemotherapy regimens for metastatic non-small-cell lung cancer (NSCLC). Four hundred eighty-six good performance status patients (PS 0 or 1; 81%) were randomized to receive cyclophosphamide, doxorubicin, methotrexate, and procarbazine (CAMP); mitomycin, vinblastine, and cisplatin (MVP); etoposide and cisplatin (VP-P); or vindesine and cisplatin (VDA-P). All regimens were administered in the doses and schedules originally reported. Complete response (CR) plus partial response (PR) rates for the four regimens were CAMP, 17%; MVP, 31%; VP-P, 20%; and VDA-P, 25%. The response rate for MVP was significantly higher in patients with squamous and adenocarcinoma histologies, but there was no impact on median survival (overall, 24.5 weeks). The duration of response did not differ by treatment as previously suggested for VDA-P. There were 15 CRs (CAMP, one; MVP, six; VP-P, two; VDA-P, six), and 12 patients have survived more than 2 years. Toxicity was significant with 20 treatment-related deaths. CAMP was significantly less toxic than the other regimens (P less than .001). VDA-P demonstrated significantly more life-threatening (seven) and lethal (three) episodes of nephrotoxicity (P less than .001) despite an aggressive hydration program that in itself caused significant morbidity. Analysis of the toxicity data showed, however, that most of the severe toxicity occurred in the 19% of patients who were initially PS 2, suggesting that they are not appropriate candidates for trials of new agents or combinations. None of these regimens can be recommended as a standard therapy for metastatic NSCLC.

A randomized comparison of standard chemotherapy versus alternating chemotherapy and maintenance versus no maintenance therapy for extensive-stage small-cell lung cancer: a phase III study of the Eastern Cooperative Oncology Group.

The present randomized, prospective study was designed to assess whether alternating induction cyclophosphamide, doxorubicin, vincristine-altretamine (hexamethylmelamine), etoposide, and methotrexate (CAV-HEM) chemotherapy is better than standard chemotherapy (CAV) in improving response, survival, and remission time in 577 evaluable patients having extensive-disease small-cell lung cancer (SCLC). In addition, the study was designed to assess the impact of maintenance chemotherapy following a complete response (CR) on the time to progression and survival. The response rates (CR plus partial response [PR]) for CAV-HEM and CAV were 64% and 61%, respectively, but 23% of the patients on CAV-HEM achieved a CR compared with 16% for CAV alone (P = .03). Among complete responders, the continuation of therapy significantly increased the remission time for patients on CAV, while maintenance therapy for patients on CAV-HEM had no significant impact on remission time. However, the increased remission had little effect on survival. Patients on CAV maintenance therapy survived marginally longer than those patients on no maintenance therapy, whereas patients who received CAV-HEM and no maintenance therapy survived longer than those on maintenance therapy. CAV-HEM was associated with significantly higher severity of complications (ie, mainly myelosuppression) than CAV (P = .01). Maintenance chemotherapy was associated with significantly more complications than no maintenance therapy. Patients on CAV-HEM lived significantly longer than those on CAV alone (45.9 weeks v 42.7 weeks; P = .002). Ten percent of patients treated on CAV-HEM survived at least 2 years, compared with 4% on CAV alone. In our study involving patients with extensive-disease SCLC, the alternating induction chemotherapy significantly increased the CR rates and had a small impact on long-term survival compared with the results achieved with standard induction chemotherapy. Moreover, when the alternating induction chemotherapy was used, long-term maintenance chemotherapy was not needed.

The clinical significance of variant-morphology small-cell carcinoma of the lung.

Past attempts to subclassify small-cell lung cancer (SCCL) histology (oat cell, fusiform, polygonal, intermediate, etc) have not been useful because of interrater variability and a lack of clinical significance. A review of outcome in a previous series suggested that a different histologic subtype, small-cell/large-cell (SC/LC) conferred an inferior response and survival analogous to the relative chemotherapy and radiation resistance seen in the variant-morphology (SC/LC) cultured cell lines. To evaluate the clinical impact of SC/LC we applied the proposed International Association for the study of Lung Cancer (IASLC) histology subclassification that incorporates the SC/LC category for patients with extensive-disease SCCL entering Eastern Cooperative Oncology Group (ECOG) protocol 1582. All cases were reviewed for eligibility by one pathologist, and all possible SC/LC (variant) plus 10% of all cases were reviewed together with a second pathologist; 577 of the 628 patients who entered were eligible, of whom 550 had histologic material submitted for review and are considered for this analysis. Initial review disclosed 24 cases with SC/LC (4.4%) and 526 with "classic" histology. The second review showed 100% agreement for classic form, but only 11 SC/LC cases with concordance between the reviewing pathologists. Eight of 24 (33%) cases from first review and three of 11 (27%) with concordance on second review achieved complete response (CR) compared with 101 of 526 (19%) for "classic" SCCL (P = .11 and .45, respectively, for the first and second review groups).(ABSTRACT TRUNCATED AT 250 WORDS)

Superiority of quantitative exercise thallium-201 variables in determining long-term prognosis in ambulatory patients with chest pain: a comparison with cardiac catheterization.

The purpose of this study was to determine the prognostic utility of quantitative exercise thallium-201 imaging and compare it with that of cardiac catheterization in ambulatory patients. Accordingly, long-term (4 to 9 years) follow-up was obtained in 293 patients who underwent both tests for the evaluation of chest pain: 89 had undergone coronary artery bypass graft surgery within 3 months of testing and were excluded from analysis, 119 experienced no cardiac events and 91 had an event (death in 20, nonfatal myocardial infarction in 21 and coronary artery bypass operations performed greater than 3 months after cardiac catheterization in 50). When all variables were analyzed using Cox regression analysis, the quantitatively assessed lung/heart ratio of thallium-201 activity was the most important predictor of a future cardiac event (chi 2 = 40.21). Other significant predictors were the number of diseased vessels (chi 2 = 17.11), patient gender (chi 2 = 9.43) and change in heart rate from rest to exercise (chi 2 = 4.19). Whereas the number of diseased vessels was an important independent predictor of cardiac events, it did not add significantly to the overall ability of the exercise thallium-201 test to predict events. Furthermore, information obtained from thallium-201 imaging alone was marginally superior to that obtained from cardiac catheterization alone (p = 0.04) and significantly superior to that obtained from exercise testing alone (p = 0.02) in determining the occurrence of events. In addition, unlike the exercise thallium-201 test, which could predict the occurrence of all categories of events, catheterization data were not able to predict the occurrence of nonfatal myocardial infarction. The exclusion of bypass surgery and previous myocardial infarction did not alter the results. In conclusion, data from this study demonstrate that exercise thallium-201 imaging may be superior to data from both exercise testing alone and cardiac catheterization data alone for predicting future events in ambulatory patients who have undergone both exercise thallium-201 imaging and catheterization for the evaluation of chest pain.

Bleeding time prolongation and bleeding during infusion of recombinant tissue-type plasminogen activator in dogs: potentiation by aspirin and reversal with aprotinin.

Thrombolytic therapy is associated with a bleeding tendency that may be exacerbated by adjunctive antiplatelet agents. The effect of recombinant tissue-type plasminogen activator (rt-PA) alone or in combination with aspirin on serial measurements of template bleeding time, ex vivo platelet aggregation and coagulation factors and the frequency of bleeding was studied in dogs. During infusion of rt-PA (15, 30 or 60 micrograms/kg per min for 90 min), a dose-related increase in bleeding time was observed. In a randomized blinded study of 25 dogs, the baseline bleeding time (mean +/- SD) was 3.5 +/- 1 min in control animals and 4 +/- 2 min after oral aspirin (15 mg/kg body weight). Infusion of rt-PA (15 micrograms/kg per min for 90 min) prolonged the bleeding time to a maximum of 15 +/- 12 min. In contrast, combined aspirin and rt-PA therapy produced an increase to greater than 30 min during infusion, reverting to 13 +/- 10 min within 2 h after cessation of infusion. Recurrent continuous bleeding from incision sites occurred in one of six dogs given aspirin alone, two of seven given rt-PA alone and all six dogs given both aspirin and rt-PA (p = 0.02). Bleeding time greater than 9 min correlated significantly with bleeding frequency (p less than 0.0001), with a sensitivity of 100% and a specificity of 87%. Intravenous bolus injection of aprotinin (20,000 kallikrein inhibitor units/kg body weight) in six dogs given both rt-PA and aspirin produced a decrease in bleeding time from greater than 30 min to 9.5 +/- 9 min and resulted in cessation of bleeding. Thus, bleeding and bleeding time prolongation in this canine model are potentiated by a marked interactive effect of rt-PA and aspirin that is rapidly reversible. Template bleeding times may provide a useful quantitative index for monitoring the bleeding tendency associated with thrombolytic therapy.

Detection of coronary artery reperfusion with creatine kinase-MB determinations during thrombolytic therapy: correlation with acute angiography.

Increases in plasma creatine kinase-MB (MB CK) were correlated with the onset of coronary artery reperfusion determined angiographically in 32 patients with acute myocardial infarction who were treated with recombinant human tissue-type plasminogen activator (rt-PA). Reperfusion occurred in 14 (70%) of 20 patients with left anterior descending coronary artery occlusion and in 8 (73%) of 11 patients with right coronary artery occlusion. One patient had persistent left circumflex coronary artery occlusion. Plasma MB CK levels (radioimmunometric assay) did not increase significantly in patients with persistent occlusion, but increased by a mean (+/- SEM) of 8 +/- 1 and 6 +/- 1 times over pretreatment levels at the end of the infusion in patients with a reperfused left anterior descending and right coronary artery, respectively. When a greater than or equal to 2.5-fold increase in MB CK levels at the end of the rt-PA infusion was taken as evidence of reperfusion of the left anterior descending coronary artery, 13 (93%) of 14 patients with reperfusion and 5 (83%) of 6 with persistent occlusion were correctly identified. When a greater than or equal to 2.2-fold increase in MB CK levels was used to identify right coronary artery reperfusion, seven (89%) of eight patients with persistent occlusion were correctly identified. The sensitivity and specificity of these indexes, derived from and applied to the same patient group, were 91 and 89%, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)

Myocardial uptake and clearance of thallium-201 in normal subjects: comparison of dipyridamole-induced hyperemia with exercise stress.

Thallium-201 uptake and clearance after dipyridamole infusion may differ from that after exercise stress because the hemodynamic effects of these two interventions are different. In this study of normal volunteers, thallium kinetics after dipyridamole (n = 13) were determined from three serial image sets (early, intermediate and delayed) and from serial blood samples and compared with thallium kinetics after exercise (n = 15). Absolute myocardial thallium uptake was greater after dipyridamole compared with exercise (p less than 0.0001), although the relative myocardial distribution was similar. The myocardial clearance (%/h) of thallium was slower after dipyridamole than it was after exercise. Comparing dipyridamole and exercise, the differences in clearance were large from the early to the intermediate image (anterior, -11 +/- 17 versus 24 +/- 5, p = 0.0005; 50 degrees left anterior oblique, -7 +/- 11 versus 15 +/- 8, p = 0.004; 70 degrees left anterior oblique, 3 +/- 9 versus 21 +/- 6, p = 0.001). In contrast, the differences in clearance were small from the intermediate to the delayed image (anterior, 15 +/- 4 versus 20 +/- 2, p = 0.025; 50 degrees left anterior oblique, 15 +/- 4 versus 19 +/- 3, p = 0.13; 70 degrees left anterior oblique, 15 +/- 3 versus 18 +/- 2, p = 0.047). Thallium uptake and clearance in the liver, splanchnic region and spleen were greater after dipyridamole (p less than 0.001). Blood thallium levels were greater after dipyridamole (p less than 0.05) and cleared more slowly (p = 0.07). Thus, myocardial thallium-201 uptake and clearance after dipyridamole infusion differ from thallium kinetics after exercise. This difference is, in part, related to associated differences in extracardiac and blood kinetics. Diagnostic criteria for the detection of abnormal thallium-201 clearance must be specific for the type of intervention.

Decreased serotonin function in bulimia nervosa.

BACKGROUND: Evidence that serotonin-active antidepressant medications decrease binge eating in patients with bulimia nervosa has fueled interest in the hypothesis that abnormal serotonergic neurotransmitter function contributes to symptoms of the disorder. To evaluate this hypothesis, we employed pharmacological challenge testing to compare serotonin function in patients with bulimia nervosa and healthy controls. METHODS: Neuroendocrine response patterns were compared for 15 nonhospitalized, medication-free, normal-weight women with bulimia nervosa and 14 age-matched healthy female controls. Behavioral assessment included ratings of eating disorder symptoms, depression, and anxiety. Serotonergic response patterns were assessed by measuring the increase in serum prolactin concentration during 5 hours following single-dose, oral administration of 60 mg of d,l-fenfluramine hydrochloride (Pondimin). RESULTS: For patients with bulimia nervosa, the fenfluramine-stimulated increase in serum prolactin concentration was significantly less than for controls. Within the patient group, the frequency of binge eating episodes during the 4 weeks prior to the study exhibited a significant inverse correlation with serotonin-stimulated prolactin secretion. CONCLUSION: Our study provides new evidence that impaired central nervous system serotonergic responsiveness may contribute to the onset or maintenance of abnormal eating patterns in patients with bulimia nervosa.

A Phase I study of continuous infusion doxorubicin and paclitaxel chemotherapy with granulocyte colony-stimulating factor for relapsed epithelial ovarian cancer.

A Phase I study of paclitaxel and doxorubicin administered as concurrent 96-h continuous i.v. infusion was performed to determine the maximum tolerated dose (MTD), principal toxicities, and pharmacokinetics of this combination in women with relapsed epithelial ovarian cancer. The paclitaxel dose was fixed at 100 mg/m2 (25 mg/m2/day for 4 days). The dose of doxorubicin was escalated from 30 mg/m2 (7.5 mg/m2/day for 4 days) in increments of 10 mg/m2 until dose-limiting toxicity was observed. All patients received granulocyte colony-stimulating factor 5 microg/kg/day prophylactically. Apparent steady-state plasma levels of both drugs were determined in the final cohort of patients treated at the MTD. A total of 17 patients received 52 cycles of therapy. The median age was 58 years, and all patients had previously received one to five different regimens (median, 2) of chemotherapy, including both platinum and paclitaxel. The treatment was tolerated well, with grade 1-2 nausea being the most frequent side effect (73% of cycles). Anemia, neutropenia, thrombocytopenia, and mucositis became dose limiting at the fourth dose level, defining the MTD of doxorubicin in this regimen as 50 mg/m2. There were four partial responses and one complete response in 15 evaluable patients. Apparent steady-state plasma concentrations (mean +/- SD) of paclitaxel and doxorubicin in the three patients treated at the MTD were 33.9 +/- 12.5 nM and 15.7 +/- 1.3 nM, respectively. Paclitaxel and doxorubicin by continuous infusion is a well-tolerated and active chemotherapy regimen for recurrent ovarian cancer.

Designing phase II studies of chemotherapy for HIV infection using CD4 as an end-point.

OBJECTIVE: To provide information that will be helpful in designing AIDS clinical trials that use CD4 as an end-point. DESIGN: Meta-analysis of randomized AIDS clinical trials comparing zidovudine and placebo. SETTING: Tertiary care. PATIENTS: Eight hundred and twenty-seven patients with HIV infection. INTERVENTIONS: Treatment with zidovudine at various dosages compared with placebo. MAIN OUTCOME MEASURE: Differences in the log-ratio CD4 count. RESULTS: The mean difference in the log-ratio CD4 count divided by its standard deviation varied from 0.31 to 0.76 depending on the study. Of the variation in CD4 count 63% is short-term variation. CONCLUSION: Trials of 12 weeks duration can be used to test for the effect of a new drug on CD4 counts. Testing combination therapies may require somewhat longer trial periods. The sample size for clinical trials can be reduced by replicating baseline and follow-up measurements. Trials of new agents should test for an increase in CD4 over baseline. Such trials will require between 25 and 190 patients per arm depending on the patient population. Trials that compare combinations to standard therapies will require between 32 and 235 patients per arm depending on disease stage and prior therapy of study participants.

Delayed central nervous system myelination in the sudden infant death syndrome.

This study was designed to assess whether development of the central nervous system (CNS) is delayed in victims of the sudden infant death syndrome (SIDS). We selected the parameter of myelination because it is a continuously changing and readily accessible marker of CNS development in the SIDS age-range. We assessed myelination blindly in 61 SIDS and 89 autopsy controls. In 62 sites the degree of myelination was visually graded in myelin-stained histological sections on an ordinal scale of 0-4 using the inferior cerebellar peduncle as an internal standard of degree 3. Cases were stratified by postconceptional age at death and SIDS and controls were compared with respect to myelin degree at each site. Significantly delayed myelination (p less than 0.05) occurred in the SIDS group in 25 of the 62 sites examined. Hypomyelination affected fiber systems in which myelination is initiated before or after birth and which myelinate with different tempos and preferentially affect pyramidal and cerebellar (somatomotor) and prefrontal-temporal-limbic (visceromotor) systems. Hypomyelination was not associated with individual clinicopathologic variables in the SIDS group. Somatic growth and brain weight were significantly greater in SIDS than controls. Therefore, we suggest that SIDS is associated with a developmental CNS disorder. Although delayed CNS myelination most likely shares a common antecedent with sudden death and is not its cause, the role of somato- and viscero-motor systems in central cardiorespiratory control and arousal warrants further analysis in SIDS.