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Dive into the research topics where Leonard Kaizer is active.

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Featured researches published by Leonard Kaizer.


Quality of Life Research | 1994

Psychometric properties and responsiveness of the EORTC Quality of Life Questionnaire (QLQ-C30) in patients with breast, ovarian and lung cancer

David Osoba; B. Zee; Joseph L. Pater; D. Warr; Leonard Kaizer; J. Latreille

The QLQ-C30, a health-related quality of life questionnaire developed for use in patients with cancer, has been previously validated in patients with lung cancer and head and neck cancer. In this study, further validation was carried out for 535 patients, including patients with breast cancer (n=143) and ovarian cancer (n=111) for whom there is no previously published validation, as well as patients with lung cancer (n=121). All patients were entered in one of two trials of anti-emetics to prevent chemotherapy-induced emesis. The QLQ-C30 was completed before chemotherapy and on day 8 after chemotherapy. The factor structure in patients with breast and ovarian cancer was similar to that previously described. Interdomain correlations, in the entire group, were strongest for the physical and role function domains and the fatigue, pain and global quality of life.domains before and after chemotherapy. In addition, after chemotherapy, social function was also strongly correlated with fatigue and global quality of life. These correlations were not always of equal strength in the breast, ovarian and lung groups, suggesting that there may be differences between these groups. The responsiveness of the QLQ-C30 in the presence of widely metastatic, as compared with locoregional, disease showed changes in the expected directions (i.e., diminished function in physical and social role functions and in global quality of life, with greater fatigue and pain in patients with metastatic disease). Eight days after chemotherapy, decreases were seen in physical, role and social functioning and in global quality of life, and there was greater fatigue, nausea and vomiting compared with before chemotherapy. Patients with breast cancer had better physical, role and social functioning, and less fatigue and pain than patients with ovarian cancer. This result is expected, since many of the patients with breast cancer had early stage disease, whereas those with ovarian cancer had advanced stage disease. Mean scores for patients with lung cancer were between the other two groups, in keeping with the mixture of early and advanced stage disease in these patients. There was a strong correlation between ECOG performance status scores and several domains of the QLQ-C30; these were all in the expected directions. The results of this study confirm those in earlier studies on patients with lung cancer, and provide new information on patients with breast and ovarian cancer. In addition, the QLQ-C30 is responsive to the effects of chemotherapy and of metastatic disease.


Quality of Life Research | 1997

Quality of life scores: An independent prognostic variable in a general population of cancer patients receiving chemotherapy

J. Dancey; B. Zee; David Osoba; M. Whitehead; F. Lu; Leonard Kaizer; J. Latreille; Joseph L. Pater

This report examines the prognostic associations between QOL scores measured by the EORTC QLQ-C30 and survival in a large heterogeneous population of cancer patients. Eight hundred and fifty-one cancer patients who were to receive chemotherapy were enrolled in two National Cancer Institute of Canada Clinical Trials Group (NCIC CTG) antiemetic trials. All patients completed the EORTC QLQ-C30 immediately prior to their first chemotherapy. Survival data were available and obtained for 474 of 639 patients (74%). Coxs proportional hazards model was used to assess the independent impact of QOL and demographic variables on survival. Presence of metastatic disease, diagnosis of lung or ovarian cancer, ECOG performance status, global quality of life and emotional functioning were significantly associated with survival. Global QOL was predictive in all patients, in subgroups of patients with metastatic disease, with breast and lung cancer and other tumour types. In patients with low global quality of life scores, patients with low emotional functioning ratings lived longer than did patients with high emotional functioning ratings. Patients with high global QOL live significantly longer than do patients with low global QOL. The relationship between emotional functioning in patients with low global QOL and survival needs confirmation.


Supportive Care in Cancer | 1997

Effect of postchemotherapy nausea and vomiting on health-related quality of life

David Osoba; Benny Zee; David Warr; J. Latreille; Leonard Kaizer; Joseph L. Pater

Abstract The purpose was to measure the effects of postchemotherapy nausea and vomiting (PCNV) on health-related quality of life (HQL) in patients receiving either moderately or highly emetogenic chemotherapy. The study sample consisted of 832 chemotherapy-naive patients with cancer who received either moderately or highly emetogenic chemotherapy as part of multicenter trials of new antiemetics. The patients completed the self-report European Organization for Research and Cancer (EORTC) core Quality of Life Questionnaire (QLQ-C30) before chemotherapy (baseline) and 1 week (day 8) and 2–4 weeks after chemotherapy. They also completed a self-report nausea and vomiting (NV) diary for 5–7 days after chemotherapy. To determine the effects of PCNV on HQL, the change in scores between the baseline and day 8 HQL assessments was calculated for each domain and symptom in the QLQ-C30 and compared in four subgroups of patients: those with both nausea and vomiting, those with nausea but no vomiting, those with no nausea but with vomiting, and those with neither nausea nor vomiting. The group with both nausea and vomiting showed statistically significantly worse physical, cognitive and social functioning, global quality of life, fatigue, anorexia, insomnia and dyspnea as compared to the group with neither nausea nor vomiting (0.0001<P<0.05). Patients with only nausea but no vomiting tended to have less worsening in functioning and symptoms than those having both nausea and vomiting. Increased severity of vomiting (>2 episodes) was associated with worsening of only global quality of life and anorexia as compared with 1–2 episodes of vomiting (0.0001<P<0.01). By 2–4 weeks after chemotherapy all HQL scores had either returned to their baseline levels or were better than baseline. PCNV adversely affects several quality-of-life domains, but patients with only nausea experience less disruption than do those with both nausea and vomiting. Patients with 1–2 episodes of vomiting experience almost the same degree of disruption of HQL as do patients with more than 2 episodes of vomiting.


Journal of Clinical Oncology | 2014

Randomized Comparison of Gemcitabine, Dexamethasone, and Cisplatin Versus Dexamethasone, Cytarabine, and Cisplatin Chemotherapy Before Autologous Stem-Cell Transplantation for Relapsed and Refractory Aggressive Lymphomas: NCIC-CTG LY.12

Michael Crump; John Kuruvilla; Stephen Couban; David MacDonald; Vishal Kukreti; C. Tom Kouroukis; Morel Rubinger; Rena Buckstein; Kevin Imrie; Massimo Federico; Nicola Di Renzo; Kang Howson-Jan; Tara Baetz; Leonard Kaizer; Michael Voralia; Harold J. Olney; A. Robert Turner; Jonathan Sussman; Annette E. Hay; Marina Djurfeldt; Ralph M. Meyer; Bingshu E. Chen; Lois E. Shepherd

PURPOSE For patients with relapsed or refractory aggressive lymphoma, we hypothesized that gemcitabine-based therapy before autologous stem-cell transplantation (ASCT) is as effective as and less toxic than standard treatment. PATIENTS AND METHODS We randomly assigned 619 patients with relapsed/refractory aggressive lymphoma to treatment with gemcitabine, dexamethasone, and cisplatin (GDP) or to dexamethasone, cytarabine, and cisplatin (DHAP). Patients with B-cell lymphoma also received rituximab. Responding patients proceeded to stem-cell collection and ASCT. Coprimary end points were response rate after two treatment cycles and transplantation rate. The noninferiority margin for the response rate to GDP relative to DHAP was set at 10%. Secondary end points included event-free and overall survival, treatment toxicity, and quality of life. RESULTS For the intention-to-treat population, the response rate with GDP was 45.2%; with DHAP the response rate was 44.0% (95% CI for difference, -9.0% to 6.7%), meeting protocol-defined criteria for noninferiority of GDP (P = .005). Similar results were obtained in a per-protocol analysis. The transplantation rates were 52.1% with GDP and 49.3% with DHAP (P = .44). At a median follow-up of 53 months, no differences were detected in event-free survival (HR, 0.99; stratified log-rank P = .95) or overall survival (HR, 1.03; P = .78) between GDP and DHAP. Treatment with GDP was associated with less toxicity (P < .001) and need for hospitalization (P < .001), and preserved quality of life (P = .04). CONCLUSION For patients with relapsed or refractory aggressive lymphoma, in comparison with DHAP, treatment with GDP is associated with a noninferior response rate, similar transplantation rate, event-free survival, and overall survival, less toxicity and hospitalization, and superior quality of life.


Oncology | 1996

Quality of Life Studies in Chemotherapy-Induced Emesis

David Osoba; Benny Zee; David Warr; Leonard Kaizer; J. Latreille; Joseph L. Pater

Health-related quality of life (HQL) was assessed before and after either moderately or highly emetogenic chemotherapy. When the pretreatment HQL in patients who did not vomit after chemotherapy (n = 203) was compared to those who vomited (n = 230), it was found that patients who did not vomit had better physical, role, and social function scores as well as a better global quality of life score than did patients who had one or more episodes of vomiting. Furthermore, in patients who did not vomit, the pretreatment fatigue and anorexia scores were better than in patients who did vomit. Thus, pretreatment HQL scores appear to have value in predicting which patients will experience chemotherapy-induced emesis. In the week following chemotherapy, HQL change scores from prechemotherapy values for cognitive function, global quality of life, fatigue, anorexia, insomnia and dyspnea were significantly worse in the group experiencing emesis than in the group who remained completely free of emesis. There were no differences in physical, role, emotional and social function attributable to chemotherapy-induced vomiting.


European Journal of Cancer | 1993

A randomised, double-blind comparison of granisetron with high-dose metoclopramide, dexamethasone and diphenhydramine for cisplatin-induced emesis. An NCI Canada Clinical Trials Group Phase III Trial.

David Warr; Andrew Wilan; Peter Venner; Joseph L. Pater; Leonard Kaizer; Francis Laberge; J. Latreille; David J. Stewart; Gregory O'Connell; David Osoba; Kenneth S. Wilson; Alan Davis; Dianne Johnston

151 patients (149 evaluable) receiving their first course of chemotherapy containing cisplatin in a dose of at least 50 mg/m2 were randomised to receive either a single dose of intravenous granisetron 80 micrograms/kg or intravenous metoclopramide 2 mg/kg every 2 h for five doses plus a single dose of dexamethasone 10 mg and diphenhydramine. After 24 h, there was no significant difference between groups with respect to nausea or vomiting: in the granisetron group 46% of patients had no emesis, versus 44% of the standard group. Granisetron is an antiemetic agent with efficacy similar to that of high-dose metoclopramide plus dexamethasone.


Supportive Cancer Therapy | 2005

Chemotherapy-induced emesis: quality of life and economic impact in the context of current practice in Canada.

J. Lachaine; Louise Yelle; Leonard Kaizer; Anick Dufour; Sean Hopkins; Robert Deuson

In this study, we estimated the proportion of patients who experience chemotherapy-induced nausea and vomiting (CINV) in current practice and evaluated the impact of CINV on quality of life and cost in Canada. Patients receiving highly emetogenic chemotherapy were recruited from 4 Canadian oncology centers. Patients used diaries to record information on their activities, incidence of nausea and vomiting, and health resources consumed each day for 5 days following chemotherapy. They also completed the Functional Living Index-Emesis (FLIE) questionnaire and a health utility instrument before chemotherapy and 5 days later. Of the 323 patients recruited, 266 (82%) completed their diary. On day 1, 26% of patients reported nausea or vomiting (acute emesis). From day 2 to day 5 after chemotherapy, 44% reported nausea or vomiting (delayed emesis). Patients who experienced nausea or vomiting during the study period had a decrease in FLIE score of 22% and a decrease in health utility of 15%. Patients with nausea or vomiting reported an average of 19 hours per cycle during which they were unable to perform their normal activities. Also, friends or relatives spent an average of 10 hours helping these patients. Incremental medical costs per patient experiencing CINV were


Clinical Colorectal Cancer | 2008

Adherence to Surveillance Guidelines After Curative Resection for Stage II/III Colorectal Cancer

Winson Y. Cheung; Gregory R. Pond; Mark Rother; Monika K. Krzyzanowska; Carol J. Swallow; James D. Brierley; Leonard Kaizer; Jeffrey Myers; Leena Hajra; Lillian L. Siu

61 Canadian. Including productivity losses, total incremental costs were


Journal of Oncology Practice | 2015

Population-based assessment of emergency room visits and hospitalizations among women receiving adjuvant chemotherapy for early breast cancer.

Katherine Enright; Eva Grunfeld; Lingsong Yun; Rahim Moineddin; Mohammad Ghannam; Susan Dent; Andrea Eisen; Maureen E. Trudeau; Leonard Kaizer; Craig C. Earle; Monika K. Krzyzanowska

592 Canadian per patient. Despite use of antiemetics, CINV remains problematic, impacting the quality of life of patients with cancer and increasing costs.


Leukemia & Lymphoma | 1999

Combined results of two phase II studies of Taxol® (Paclitaxel) in patients with relapsed or refractory lymphomas

Paul E. Goss; A. Keith Stewart; Felix Couture; Richard Klasa; Stefan Glück; Leonard Kaizer; Ronald L. Burkes; Danielle Charpentier; Martin Palmer; Tye Lm; Hélène Dulude

PURPOSE Our aims were to determine adherence to American Society of Clinical Oncology (ASCO) guidelines on colorectal cancer (CRC) surveillance and to evaluate differences in practice patterns and clinical outcomes between an academic institution (Princess Margaret Hospital [PMH]) and a community cancer hospital (Credit Valley Hospital [CVH]). PATIENTS AND METHODS Patients with stage II/III CRC who were diagnosed between January 1, 1999, and December 31, 2001, were identified, and their records were retrospectively reviewed. RESULTS A total of 244 and 97 patients were eligible at PMH and CVH, respectively. Surveillance patterns, including blood tests, imaging studies, and colonoscopies, were inconsistent with ASCO recommendations in a significant proportion of patients. Clinic visits occurred more frequently and imaging studies were more commonly ordered at PMH than at CVH (P < .001). In contrast, CVH performed a higher median number of blood count and liver function tests (P = .001) per patient than PMH. The rates of carcinoembryonic antigen monitoring and surveillance colonoscopies were not statistically different between centers (P = .67 and P = .43, respectively). There were a total of 70 CRC recurrences: 53 (75.7%) were detected by surveillance (44 at PMH and 9 at CVH) and 17 (24.3%) by patient symptoms (9 at PMH and 8 at CVH). For recurrences detected by surveillance, 38% were resectable, whereas only 18% of those detected by symptoms were resectable. CONCLUSION Colorectal cancer surveillance revealed noticeable departures from ASCO guidelines, with the academic institution using a more intensive surveillance strategy with imaging studies than the community cancer center. Surveillance was associated with a higher proportion of resectable tumor recurrences than was detection by patient symptoms.

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Monika K. Krzyzanowska

Princess Margaret Cancer Centre

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Vishal Kukreti

Princess Margaret Cancer Centre

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David Osoba

University of British Columbia

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David Warr

Princess Margaret Cancer Centre

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