Study to Assess Compliance With Long-Term Mercaptopurine Treatment in Young Patients With Acute Lymphoblastic Leukemia in Remission

Understanding the Ethnic and Racial Differences in Survival in Children With Acute Lymphoblastic Leukemia

This clinical trial is assessing compliance with long-term mercaptopurine treatment in young patients with acute lymphoblastic leukemia in remission. Assessing why young patients who have acute lymphoblastic leukemia may not take their medications as prescribed may help identify ways to assist them in taking their medications more consistently and may improve long-term treatment outcomes.

Study Overview

• Status: Completed
• Conditions: Childhood Acute Lymphoblastic Leukemia in Remission
• Intervention / Treatment: Other: Laboratory Biomarker Analysis; Other: Questionnaire Administration; Drug: Mercaptopurine; Drug: Methotrexate; Behavioral: Compliance Monitoring; Other: Study of Socioeconomic and Demographic Variables

Detailed Description

PRIMARY OBJECTIVES:

I. To determine and compare adherence to maintenance mercaptopurine (6-MP) in a cohort of children with acute lymphoblastic leukemia (ALL) from four different ethnic and racial groups (Caucasians, African-Americans, Hispanics, and Asians) receiving maintenance/continuation chemotherapy, using the following assessments: serial red cell 6-MP metabolites (6-thioguanine [6TGN] and methyl thioinosine monophosphate [TIMP]); frequency of 6-MP dosing using an electronic pill monitoring system (Microelectromechanical Systems [MEMS]?); self-report of adherence to 6-MP by questionnaire.

II. To determine the impact of adherence to 6-MP (measured using 6TGN, methyl [Me]TIMP, MEMS? and self-report data independently) on event-free-survival (EFS) in the entire cohort, after adjusting for known predictors of disease outcome.

III. Define a critical level of adherence (measured independently by 6TGN, MeTIMP, MEMS?, self-report) that has a significant impact on EFS for the entire cohort.

IV. Describe prevalence of adherence to 6-MP by ethnicity (6TGN, MeTIMP, MEMS?, Self-report).

V. Describe behavioral and socio-demographic predictors of adherence using the questionnaire data.

VI. Describe the pill-taking practices in this cohort using the MEMS? data. VII. To evaluate the impact of adherence on ethnic/racial difference in EFS.

SECONDARY OBJECTIVES:

I. To assess the concordance among 6TGN and MeTIMP levels, electronic pill monitoring, and self-reported adherence in the ethnic/racial groups.

OUTLINE:

Patients receive an electronic pill monitoring system comprising an empty MEMS? medication bottle with TrackCap? child resistant (CR). The mercaptopurine prescription is filled using this system. Beginning on day 1 of the third or later course of maintenance therapy, patients take all doses of mercaptopurine from the MEMS? medication bottle with TrackCap? CR for at least 169 days. The MEMS? TrackCap? CR is mailed to the Coordinating Center at the end of study. Patients also receive methotrexate orally (PO) as indicated by their individual chemotherapy regimen.

NOTE: *Study closed to accrual for Caucasian and Hispanic patients as of 8/14/2009.

After completion of study, patients are followed up every 6 months for 5 years and then annually for up to 10 years.

• Study Type: Observational
• Enrollment (Anticipated): 720

Contacts and Locations

Study Locations

• Australia
  • Western Australia
    • Perth, Western Australia, Australia, 6008
      • Princess Margaret Hospital for Children
• Canada
  • Alberta
    • Edmonton, Alberta, Canada, T6G 2B7
      • University of Alberta Hospital
  • British Columbia
    • Vancouver, British Columbia, Canada, V6H 3V4
      • British Columbia Children's Hospital
  • Nova Scotia
    • Halifax, Nova Scotia, Canada, B3K 6R8
      • IWK Health Centre
  • Ontario
    • Kingston, Ontario, Canada, K7L 2V7
      • Kingston Health Sciences Centre
    • London, Ontario, Canada, N6A 5W9
      • Children's Hospital
    • London, Ontario, Canada, N6K 1C2
      • Victoria Hospital
    • Toronto, Ontario, Canada, M5G 1X8
      • Hospital for Sick Children
  • Quebec
    • Montreal, Quebec, Canada, H3H 1P3
      • The Montreal Children's Hospital of the MUHC
  • Saskatchewan
    • Regina, Saskatchewan, Canada, S4T 7T1
      • Allan Blair Cancer Centre
    • Saskatoon, Saskatchewan, Canada, S7N 4H4
      • Saskatoon Cancer Centre
• United States
  • Alabama
    • Birmingham, Alabama, United States, 35233
      • University of Alabama at Birmingham Cancer Center
    • Birmingham, Alabama, United States, 35233
      • Children's Hospital of Alabama
  • Arkansas
    • Little Rock, Arkansas, United States, 72205
      • University of Arkansas for Medical Sciences
  • California
    • Downey, California, United States, 90242
      • Kaiser Permanente Downey Medical Center
    • Duarte, California, United States, 91010
      • City of Hope Comprehensive Cancer Center
    • Loma Linda, California, United States, 92354
      • Loma Linda University Medical Center
    • Long Beach, California, United States, 90806
      • Miller Children's and Women's Hospital Long Beach
    • Los Angeles, California, United States, 90027
      • Children's Hospital Los Angeles
    • Los Angeles, California, United States, 90095
      • UCLA / Jonsson Comprehensive Cancer Center
    • Los Angeles, California, United States, 90095
      • Mattel Children's Hospital UCLA
    • Madera, California, United States, 93636
      • Valley Children's Hospital
    • Oakland, California, United States, 94609-1809
      • Children's Hospital and Research Center at Oakland
    • Palo Alto, California, United States, 94304
      • Lucile Packard Children's Hospital Stanford University
    • Sacramento, California, United States, 95817
      • University of California Davis Comprehensive Cancer Center
    • San Diego, California, United States, 92123
      • Rady Children's Hospital - San Diego
    • San Francisco, California, United States, 94143
      • UCSF Medical Center-Parnassus
    • Torrance, California, United States, 90502
      • Harbor-University of California at Los Angeles Medical Center
  • Colorado
    • Aurora, Colorado, United States, 80045
      • Children's Hospital Colorado
  • Connecticut
    • Farmington, Connecticut, United States, 06030
      • University of Connecticut
    • Hartford, Connecticut, United States, 06106
      • Connecticut Children's Medical Center
    • New Haven, Connecticut, United States, 06520
      • Yale University
  • Delaware
    • Wilmington, Delaware, United States, 19803
      • Alfred I duPont Hospital for Children
  • District of Columbia
    • Washington, District of Columbia, United States, 20010
      • Children's National Medical Center
    • Washington, District of Columbia, United States, 20007
      • MedStar Georgetown University Hospital
  • Florida
    • Fort Myers, Florida, United States, 33901
      • Lee Memorial Health System
    • Gainesville, Florida, United States, 32610
      • University of Florida Health Science Center - Gainesville
    • Hollywood, Florida, United States, 33021
      • Memorial Regional Hospital/Joe DiMaggio Children's Hospital
    • Jacksonville, Florida, United States, 32207
      • Nemours Children's Clinic-Jacksonville
    • Miami, Florida, United States, 33136
      • University of Miami Miller School of Medicine-Sylvester Cancer Center
    • Miami, Florida, United States, 33176
      • Miami Cancer Institute
    • Orlando, Florida, United States, 32806
      • Nemours Children's Clinic - Orlando
    • Orlando, Florida, United States, 32803
      • AdventHealth Orlando
    • Pensacola, Florida, United States, 32504
      • Sacred Heart Hospital
    • Pensacola, Florida, United States, 32504
      • Nemours Children's Clinic - Pensacola
    • Saint Petersburg, Florida, United States, 33701
      • Johns Hopkins All Children's Hospital
    • Tampa, Florida, United States, 33607
      • Saint Joseph's Hospital/Children's Hospital-Tampa
  • Georgia
    • Atlanta, Georgia, United States, 30322
      • Children's Healthcare of Atlanta - Egleston
    • Augusta, Georgia, United States, 30912
      • Augusta University Medical Center
  • Hawaii
    • Honolulu, Hawaii, United States, 96813
      • University of Hawaii Cancer Center
  • Illinois
    • Chicago, Illinois, United States, 60612
      • Rush University Medical Center
    • Chicago, Illinois, United States, 60612
      • University of Illinois
    • Maywood, Illinois, United States, 60153
      • Loyola University Medical Center
    • Oak Lawn, Illinois, United States, 60453
      • Advocate Children's Hospital-Oak Lawn
    • Park Ridge, Illinois, United States, 60068
      • Advocate Lutheran General Hospital
  • Indiana
    • Indianapolis, Indiana, United States, 46202
      • Indiana University/Melvin and Bren Simon Cancer Center
    • Indianapolis, Indiana, United States, 46260
      • Saint Vincent Hospital and Health Care Center
  • Iowa
    • Des Moines, Iowa, United States, 50309
      • Blank Children's Hospital
  • Kentucky
    • Lexington, Kentucky, United States, 40536
      • University of Kentucky/Markey Cancer Center
  • Louisiana
    • New Orleans, Louisiana, United States, 70112
      • Tulane University Health Sciences Center
    • New Orleans, Louisiana, United States, 70118
      • Children's Hospital New Orleans
  • Maine
    • Bangor, Maine, United States, 04401
      • Eastern Maine Medical Center
  • Michigan
    • Ann Arbor, Michigan, United States, 48109
      • C S Mott Children's Hospital
    • Detroit, Michigan, United States, 48201
      • Wayne State University/Karmanos Cancer Institute
    • Detroit, Michigan, United States, 48236
      • Ascension Saint John Hospital
    • Flint, Michigan, United States, 48503
      • Hurley Medical Center
    • Grand Rapids, Michigan, United States, 49503
      • Spectrum Health at Butterworth Campus
    • Grand Rapids, Michigan, United States, 49503
      • Helen DeVos Children's Hospital at Spectrum Health
  • Minnesota
    • Minneapolis, Minnesota, United States, 55404
      • Children's Hospitals and Clinics of Minnesota - Minneapolis
    • Minneapolis, Minnesota, United States, 55455
      • University of Minnesota/Masonic Cancer Center
  • Mississippi
    • Jackson, Mississippi, United States, 39216
      • University of Mississippi Medical Center
  • Missouri
    • Columbia, Missouri, United States, 65212
      • University of Missouri - Ellis Fischel
    • Kansas City, Missouri, United States, 64108
      • Children's Mercy Hospitals and Clinics
    • Saint Louis, Missouri, United States, 63110
      • Washington University School of Medicine
  • Nebraska
    • Omaha, Nebraska, United States, 68198
      • University of Nebraska Medical Center
  • Nevada
    • Las Vegas, Nevada, United States, 89106
      • Nevada Cancer Research Foundation CCOP
  • New Hampshire
    • Lebanon, New Hampshire, United States, 03756
      • Dartmouth Hitchcock Medical Center
  • New Jersey
    • Hackensack, New Jersey, United States, 07601
      • Hackensack University Medical Center
    • Livingston, New Jersey, United States, 07039
      • Saint Barnabas Medical Center
    • Newark, New Jersey, United States, 07112
      • Newark Beth Israel Medical Center
    • Paterson, New Jersey, United States, 07503
      • Saint Joseph's Regional Medical Center
    • Summit, New Jersey, United States, 07902
      • Overlook Hospital
  • New Mexico
    • Albuquerque, New Mexico, United States, 87102
      • University of New Mexico Cancer Center
  • New York
    • Bronx, New York, United States, 10467
      • Montefiore Medical Center - Moses Campus
    • Brooklyn, New York, United States, 11201
      • Brooklyn Hospital Center
    • Buffalo, New York, United States, 14263
      • Roswell Park Cancer Institute
    • Mineola, New York, United States, 11501
      • NYU Winthrop Hospital
    • New York, New York, United States, 10032
      • NYP/Columbia University Medical Center/Herbert Irving Comprehensive Cancer Center
    • New York, New York, United States, 10016
      • Laura and Isaac Perlmutter Cancer Center at NYU Langone
    • Stony Brook, New York, United States, 11794
      • Stony Brook University Medical Center
    • Syracuse, New York, United States, 13210
      • State University of New York Upstate Medical University
    • Valhalla, New York, United States, 10595
      • New York Medical College
  • North Carolina
    • Asheville, North Carolina, United States, 28801
      • Mission Hospital Inc-Memorial Campus
    • Charlotte, North Carolina, United States, 28204
      • Novant Health Presbyterian Medical Center
    • Durham, North Carolina, United States, 27710
      • Duke University Medical Center
    • Winston-Salem, North Carolina, United States, 27157
      • Wake Forest University Health Sciences
  • Ohio
    • Akron, Ohio, United States, 44308
      • Children's Hospital Medical Center of Akron
    • Cleveland, Ohio, United States, 44106
      • Rainbow Babies and Childrens Hospital
    • Columbus, Ohio, United States, 43205
      • Nationwide Children's Hospital
    • Dayton, Ohio, United States, 45404
      • Dayton Children's Hospital
    • Toledo, Ohio, United States, 43606
      • The Toledo Hospital/Toledo Children's Hospital
  • Oklahoma
    • Oklahoma City, Oklahoma, United States, 73104
      • University of Oklahoma Health Sciences Center
    • Tulsa, Oklahoma, United States, 74136
      • Natalie Warren Bryant Cancer Center at Saint Francis
  • Oregon
    • Portland, Oregon, United States, 97227
      • Legacy Emanuel Hospital and Health Center
  • Pennsylvania
    • Bethlehem, Pennsylvania, United States, 18017
      • Lehigh Valley Hospital - Muhlenberg
    • Danville, Pennsylvania, United States, 17822
      • Geisinger Medical Center
    • Philadelphia, Pennsylvania, United States, 19104
      • Children's Hospital of Philadelphia
    • Pittsburgh, Pennsylvania, United States, 15224
      • Children's Hospital of Pittsburgh of UPMC
  • Rhode Island
    • Providence, Rhode Island, United States, 02903
      • Rhode Island Hospital
  • South Carolina
    • Columbia, South Carolina, United States, 29203
      • Prisma Health Richland Hospital
  • South Dakota
    • Sioux Falls, South Dakota, United States, 57117-5134
      • Sanford USD Medical Center - Sioux Falls
  • Tennessee
    • Chattanooga, Tennessee, United States, 37403
      • T C Thompson Children's Hospital
    • Knoxville, Tennessee, United States, 37916
      • East Tennessee Childrens Hospital
    • Nashville, Tennessee, United States, 37232
      • Vanderbilt University/Ingram Cancer Center
  • Texas
    • Amarillo, Texas, United States, 79106
      • Texas Tech University Health Sciences Center-Amarillo
    • Austin, Texas, United States, 78723
      • Dell Children's Medical Center of Central Texas
    • Corpus Christi, Texas, United States, 78411
      • Driscoll Children's Hospital
    • Dallas, Texas, United States, 75390
      • UT Southwestern/Simmons Cancer Center-Dallas
    • Dallas, Texas, United States, 75230
      • Medical City Dallas Hospital
    • Houston, Texas, United States, 77030
      • Baylor College of Medicine/Dan L Duncan Comprehensive Cancer Center
    • Lubbock, Texas, United States, 79410
      • Covenant Children's Hospital
    • San Antonio, Texas, United States, 78229
      • University of Texas Health Science Center at San Antonio
    • San Antonio, Texas, United States, 78229
      • Methodist Children's Hospital of South Texas
    • Temple, Texas, United States, 76508
      • Scott and White Memorial Hospital
  • Utah
    • Salt Lake City, Utah, United States, 84113
      • Primary Children's Hospital
  • Vermont
    • Burlington, Vermont, United States, 05405
      • University of Vermont and State Agricultural College
  • Virginia
    • Falls Church, Virginia, United States, 22042
      • Inova Fairfax Hospital
    • Richmond, Virginia, United States, 23298
      • Virginia Commonwealth University/Massey Cancer Center
  • Washington
    • Seattle, Washington, United States, 98105
      • Seattle Children's Hospital
    • Spokane, Washington, United States, 99204
      • Providence Sacred Heart Medical Center and Children's Hospital
    • Tacoma, Washington, United States, 98431
      • Madigan Army Medical Center
  • West Virginia
    • Charleston, West Virginia, United States, 25304
      • West Virginia University Charleston Division
  • Wisconsin
    • Green Bay, Wisconsin, United States, 54301
      • Saint Vincent Hospital Cancer Center Green Bay
    • Marshfield, Wisconsin, United States, 54449
      • Marshfield Medical Center-Marshfield
    • Milwaukee, Wisconsin, United States, 53226
      • Children's Hospital of Wisconsin

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: No older than 21 years (Child, Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

• Sampling Method: Non-Probability Sample

Study Population

Children with ALL from four different ethnic and racial groups (Caucasians, African-Americans, Hispanics, and Asians) receiving maintenance/continuation chemotherapy.

Description

Inclusion Criteria:

• Diagnosis of ALL in first remission, irrespective of risk stratification; enrollment on a Children's Oncology Group (COG) therapeutic study for ALL is not required, but the treatment plan must meet the criteria in this protocol

• Belongs to one of the four following ethnic/racial categories: African-American, Asian, Caucasian, or Hispanic; below please find definitions for these categories

  • African-American: includes patients who are African-American or of sub-Saharan black African ancestry
  • Asian: patients of Asian ancestry, including the following: Asian Indian (subcontinent), Chinese, Japanese, Korean, Native Hawaiian, Guamanian or Chamorro, Pacific Islander, Filipino, Vietnamese, Samoan, Hmong, Cambodian, Thai, Laotian, or Other Asian races
  • Caucasian: includes White or light-skinned patients of European, North African, or Middle Eastern ancestry
  • Hispanic: patients of Hispanic ethnicity, including the following: Mexican, Mexican American, Chicano, Cuban, Puerto Rican, or Other Spanish/Hispanic/Latino ethnicity

• Receiving self- or parent/caregiver-administered oral anti-metabolite chemotherapy during the maintenance/continuation phase of therapy; patients are eligible if their treatment plan calls for the following doses of 6-MP and methotrexate (MTX) during the maintenance/continuation phase: 6-MP ? 75 mg/m^2/day orally; MTX 20 mg/m^2/week orally;** (modification of 6-MP or MTX dosing based on laboratory or clinical parameters is acceptable)

  • For guidance regarding if and when a patient being treated on or according to a specific COG (or legacy group) protocol is eligible, please refer to ?AALL03N1 Eligibility by Protocol Tool,? available in the study data forms packet on the COG website

• Has completed at least 24 weeks of maintenance/continuation chemotherapy, and is scheduled to receive at least 24 more weeks of maintenance/continuation chemotherapy**

  • For guidance regarding if and when a patient being treated on or according to a specific COG (or legacy group) protocol is eligible, please refer to ?AALL03N1 Eligibility by Protocol Tool,? available in the study data forms packet on the COG website
• Written informed consent from the patient and/or the patient?s legally authorized guardian, obtained prior to registration and any study-related procedures, and in accordance with institutional policies approved by the United States (U.S) Department of Health and Human Services

Exclusion Criteria:

• Patients of multi-ethnic/multi-racial backgrounds are not eligible for this study; while patients of multi-ethnic/multi-racial ancestry (e.g., Caucasian/Japanese, Hawaiian/Puerto Rican) are not eligible, patients of mixed ancestry within a race/ethnicity (e.g., Japanese/Chinese = Asian or Korean/Japanese/Hawaiian = Asian or Mexican/Puerto Rican = Hispanic) may participate as long as they fall under the general classification of "African-American," "Asian," "Caucasian," or "Hispanic"

Study Plan

How is the study designed?

Number of groups / cohorts

1

Cohorts and Interventions

Group / Cohort

Intervention / Treatment

Health service research (electronic pill monitoring system); Patients receive an electronic pill monitoring system comprising an empty MEMS^? medication bottle with TrackCap? CR. The mercaptopurine prescription is filled using this system. Beginning on day 1 of the third or later course of maintenance therapy, patients take all doses of mercaptopurine from the MEMS^? medication bottle with TrackCap? CR for at least 169 days. The MEMS^? TrackCap? CR is mailed to the Coordinating Center at the end of study. Patients also receive methotrexate PO as indicated by their individual chemotherapy regimen.

Other: Laboratory Biomarker Analysis; Correlative studies; Other: Questionnaire Administration; Ancillary studies; Drug: Mercaptopurine; Given PO; Other Names: 6-MP; Purinethol; 3H-Purine-6-thiol; 6 MP; 6 Thiohypoxanthine; 6 Thiopurine; 6-Mercaptopurine; 6-Mercaptopurine Monohydrate; 6-Purinethiol; 6-Thiopurine; 6-Thioxopurine; 6H-Purine-6-thione, 1,7-dihydro- (9CI); 7-Mercapto-1,3,4,6-tetrazaindene; Alti-Mercaptopurine; Azathiopurine; Flocofil; Ismipur; Leukerin; Leupurin; Mercaleukim; Mercaleukin; Mercaptina; Mercaptopurinum; Mercapurin; Mern; NCI-C04886; Puri-Nethol; Purimethol; Purine, 6-mercapto-; Purine-6-thiol (8CI); Purine-6-thiol, monohydrate; Purinethiol; U-4748; WR-2785; BW 57-323H; Drug: Methotrexate; Given PO; Other Names: Abitrexate; Folex; Mexate; MTX; Alpha-Methopterin; Amethopterin; Brimexate; CL 14377; CL-14377; Emtexate; Emthexat; Emthexate; Farmitrexat; Fauldexato; Folex PFS; Lantarel; Ledertrexate; Lumexon; Maxtrex; Medsatrexate; Metex; Methoblastin; Methotrexate LPF; Methotrexate Methylaminopterin; Methotrexatum; Metotrexato; Metrotex; Mexate-AQ; Novatrex; Rheumatrex; Texate; Tremetex; Trexeron; Trixilem; WR-19039; Behavioral: Compliance Monitoring; Receive an electronic pill monitoring system comprising an empty MEMS medication bottle with TrackCap; Other: Study of Socioeconomic and Demographic Variables; Receive an electronic pill monitoring system comprising an empty MEMS medication bottle with TrackCap

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Adherence to 6-MP as measured by 6TGN and MethylTIMP levels	Will initially perform an exploratory data analysis on distributions across the four groups using side-by-side boxplots, histograms, and summary quantities (mean, median, quartiles, standard deviations, inter-quartile-range, etc.). If central values summarize across-group differences well, then mean and median of the distribution will be compared between 6 pairs of the four ethnic groups using the two-sample t-test and the Mann-Whitney U-test. Will perform these tests adjusting for 6 pairwise multiple comparisons among the four groups using the Bonferroni?s correction method.	169 days
Adherence as measured by frequency of 6-MP dosing as a continuous variable using MEMS? defined as the number of days the MEMS? Cap openings are recorded, taken as a percentage of days doses were prescribed during the study period	Will initially perform an exploratory data analysis on distributions across the four groups using side-by-side boxplots, histograms, and summary quantities (mean, median, quartiles, standard deviations, inter-quartile-range, etc.). If central values summarize across-group differences well, then mean and median of the distribution will be compared between 6 pairs of the four ethnic groups using the two-sample t-test and the Mann-Whitney U-test. Will perform these tests adjusting for 6 pairwise multiple comparisons among the four groups using the Bonferroni?s correction method.	Up to 169 days
Self-report of adherence to 6-MP by questionnaire, defined as the number of days doses of 6-MP are reported to being taken, as a percentage of days doses were prescribed during the study period	Will initially perform an exploratory data analysis on distributions across the four groups using side-by-side boxplots, histograms, and summary quantities (mean, median, quartiles, standard deviations, inter-quartile-range, etc.). If central values summarize across-group differences well, then mean and median of the distribution will be compared between 6 pairs of the four ethnic groups using the two-sample t-test and the Mann-Whitney U-test. Will perform these tests adjusting for 6 pairwise multiple comparisons among the four groups using the Bonferroni?s correction method.	169 days
EFS	For each of the three types of adherence measures, will fit independent Cox?s proportional-hazard models to assess the prognostic significance of the adherence measure on EFS, after adjusting for known predictors of disease outcome, including the National Cancer Institute risk group (based on the age at diagnosis and presenting white cell count) and chromosomal abnormalities.	Up to 10 years
Critical level of adherence (measured independently by 6TGN/MethylTIMP, MEMS?, self-report) that has a significant impact on EFS	Will fit a separate Cox regression model to each of the three adherence measures (i.e., 6TGN, MeTIMP, MEMS, and self-report). Using no more than several knots, the natural spline (a special type of cubic splines) fits a very wide range of smoothly changing adherence effects. The adherence effects on EFS will be visualized graphically. This will be the primary approach for defining the critical level of adherence. To confirm the spline analysis results, will categorize the continuous adherence measures into multiple levels and estimate the effect of each adherence level.	Up to 10 years
Prevalence of adherence to 6-MP by ethnicity (measured independently by 6TGN/MethylTIMP, MEMS?, Self-report) that has a significant impact on EFS	Will describe the prevalence of non-adherence by race/ethnicity and compare the prevalence by using two-tailed chi-squared test (with a Yates' correction).	Up to 10 years
Behavioral, socio-demographic predictors of adherence using the questionnaire data	The reasons for non-adherence will be assessed. The relationship between adherence to 6-MP as reported by the patients/parents and the independent behavioral variables knowledge of medications, understanding of treatment regimen, extent of treatment side effects, length of treatment, and beliefs about the efficacy of the regimen, beliefs and attitudes towards health and medical care will be evaluated descriptively first using standard parametric or non-parametric tests, and then analytically by logistic regression (dichotomous adherence) or linear regression (continuous adherence).	Up to 10 years
Pill-taking practices using the MEMS? data	Using the MEMS? output data, the adherence report will be analyzed for: i) longest and shortest interval between doses in hours; ii) percent prescribed doses taken, and iii) percent prescribed doses taken on schedule.	Up to 169 days
Impact of adherence (measured independently by 6TGN/MethylTIMP, MEMS, self-report) on ethnic/racial differences in EFS	Will fit independent Cox?s proportional-hazard models to assess the impact of adherence measure on EFS, after adjusting for known predictors of disease outcome, including the National Cancer Institute risk group (based on the age at diagnosis and presenting white cell count) and chromosomal abnormalities.	Up to 10 years

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Concordance among red cell thiopurine metabolite levels, electronic pill monitoring, and self-reported adherence among the ethnic/racial groups	Correlations between mean dosage- and TPMT-normalized serial red cell 6-MP metabolites and mean adherence by electronic pill monitoring system and self-report will be assessed for statistical significance by Spearman's rank correlation coefficient.	Up to 168 days

Collaborators and Investigators

• Sponsor: Children's Oncology Group
• Collaborators: National Cancer Institute (NCI)

Publications and helpful links

General Publications

• Yang JJ, Landier W, Yang W, Liu C, Hageman L, Cheng C, Pei D, Chen Y, Crews KR, Kornegay N, Wong FL, Evans WE, Pui CH, Bhatia S, Relling MV. Inherited NUDT15 variant is a genetic determinant of mercaptopurine intolerance in children with acute lymphoblastic leukemia. J Clin Oncol. 2015 Apr 10;33(11):1235-42. doi: 10.1200/JCO.2014.59.4671. Epub 2015 Jan 26.
• Bhatia S, Landier W, Hageman L, Kim H, Chen Y, Crews KR, Evans WE, Bostrom B, Casillas J, Dickens DS, Maloney KW, Neglia JP, Ravindranath Y, Ritchey AK, Wong FL, Relling MV. 6MP adherence in a multiracial cohort of children with acute lymphoblastic leukemia: a Children's Oncology Group study. Blood. 2014 Oct 9;124(15):2345-53. doi: 10.1182/blood-2014-01-552166. Epub 2014 May 14.

Study record dates

Study Major Dates

• Study Start (Actual): May 30, 2005
• Primary Completion (Actual): March 5, 2012
• Study Completion (Actual): June 30, 2020

Study Registration Dates

• First Submitted: December 20, 2005
• First Submitted That Met QC Criteria: December 21, 2005
• First Posted (Estimate): December 22, 2005

Study Record Updates

• Last Update Posted (Actual): July 7, 2020
• Last Update Submitted That Met QC Criteria: July 1, 2020
• Last Verified: October 1, 2019

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Immune System Diseases; Neoplasms by Histologic Type; Neoplasms; Lymphoproliferative Disorders; Lymphatic Diseases; Immunoproliferative Disorders; Leukemia; Precursor Cell Lymphoblastic Leukemia-Lymphoma; Leukemia, Lymphoid; Physiological Effects of Drugs; Molecular Mechanisms of Pharmacological Action; Nucleic Acid Synthesis Inhibitors; Enzyme Inhibitors; Antirheumatic Agents; Antimetabolites, Antineoplastic; Antimetabolites; Antineoplastic Agents; Immunosuppressive Agents; Immunologic Factors; Dermatologic Agents; Reproductive Control Agents; Abortifacient Agents, Nonsteroidal; Abortifacient Agents; Folic Acid Antagonists; Methotrexate; Mercaptopurine
• Other Study ID Numbers: AALL03N1 (Other Identifier: CTEP); U10CA095861 (U.S. NIH Grant/Contract); NCI-2009-00305 (Registry Identifier: CTRP (Clinical Trial Reporting Program)); CDR0000459748; 07-462; COG-AALL03N1 (Other Identifier: DCP); R01CA096670 (U.S. NIH Grant/Contract)