Clinical Trials Logo

Clinical Trial Summary

Background: - Research suggests that occupational exposure to formaldehyde is associated with increased risk for myeloid leukemia, but the significance of these findings is uncertain because of inconsistencies among studies and lack of knowledge of how formaldehyde can cause leukemia. - Damage to the DNA of myeloid cells (type of white blood cell) or an environmental factor not affecting the cell genetic machinery may be involved. Objective: To determine if formaldehyde exposure is associated with genetic or other changes in myeloid cells. Eligibility: Workers exposed to high levels of formaldehyde and unexposed workers in Guangdong Province, China. Design: - 40 exposed workers and 40 unexposed workers will be enrolled. - Subjects wear small instruments at work that measure chemicals in the air for 1 or 2 days. - Subjects have a brief physical examination and provide blood, urine, and mouth rinse samples. - Subjects answer a questionnaire about work, smoking and drinking, use of medicines, medical history, general health, exposure to radiation and exposure to various substances at home.


Clinical Trial Description

Research in industrial workers and professionals exposed to formaldehyde suggests that occupational exposure to this important chemical is associated with increased risk for myeloid leukemia. The significance, however, of these observations for occupational and environmental health is uncertain because of inconsistencies among epidemiologic studies and lack of a demonstrated mechanism through which formaldehyde can cause leukemia. Cytogenetic damage is one potential leukemogenic mechanism, but there are few studies of formaldehyde-exposed humans. Some experimental data suggest that epigenetic changes in myeloid cells could also be involved. We plan to study 40 workers exposed to high levels of formaldehyde and 40 unexposed controls to examine the hypothesis that formaldehyde is associated with these changes. To determine formaldehyde exposure, we will incorporate a number of methods, including questionnaires to determine potential past exposure and on-site monitoring to determine current average and peak intensities of exposure. We will then examine differences in aneuploidy and structural abnormalities in myeloid progenitor cells cultured from peripheral blood. We will specifically look for differences in genes associated with myeloid leukemia such as monosomy 7 and trisomy 8 using interphase and Octochrome FISH. We will also determine whether aberrant methylation in progenitor cells, specifically hypermethylation of genes associated with myeloid leukemia, is higher in those exposed to formaldehyde. This study will substantially contribute to our understanding of the leukemogenic potential of formaldehyde, which has important public health and regulatory implications. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT01338285
Study type Observational
Source National Institutes of Health Clinical Center (CC)
Contact
Status Completed
Phase
Start date June 10, 2006
Completion date November 6, 2020

See also
  Status Clinical Trial Phase
Completed NCT03826043 - THrombo-Embolic Event in Onco-hematology N/A
Terminated NCT03166631 - A Trial to Find the Safe Dose for BI 891065 Alone and in Combination With BI 754091 in Patients With Incurable Tumours or Tumours That Have Spread Phase 1
Completed NCT01938846 - BI 860585 Dose Escalation Single Agent and in Combination With Exemestane or With Paclitaxel in Patients With Various Advanced and/or Metastatic Solid Tumors Phase 1
Recruiting NCT06058312 - Individual Food Preferences for the Mediterranean Diet in Cancer Patients N/A
Completed NCT03308942 - Effects of Single Agent Niraparib and Niraparib Plus Programmed Cell Death-1 (PD-1) Inhibitors in Non-Small Cell Lung Cancer Participants Phase 2
Recruiting NCT06018311 - Exercising Together for Hispanic Prostate Cancer Survivor-Caregiver Dyads N/A
Withdrawn NCT05431439 - Omics of Cancer: OncoGenomics
Completed NCT01343043 - A Pilot Study of Genetically Engineered NY-ESO-1 Specific NY-ESO-1ᶜ²⁵⁹T in HLA-A2+ Patients With Synovial Sarcoma Phase 1
Completed NCT01938638 - Open Label Phase I Dose Escalation Study With BAY1143572 in Patients With Advanced Cancer Phase 1
Recruiting NCT05514444 - Study of MK-4464 as Monotherapy and in Combination With Pembrolizumab in Participants With Advanced/Metastatic Solid Tumors (MK-4464-001) Phase 1
Recruiting NCT02292641 - Beyond TME Origins N/A
Terminated NCT00954512 - Study of Robatumumab (SCH 717454, MK-7454) in Combination With Different Treatment Regimens in Participants With Advanced Solid Tumors (P04722, MK-7454-004) Phase 1/Phase 2
Recruiting NCT04958239 - A Study to Test Different Doses of BI 765179 Alone and in Combination With Ezabenlimab in Patients With Advanced Cancer (Solid Tumors) Phase 1
Recruiting NCT04627376 - Multimodal Program for Cancer Related Cachexia Prevention N/A
Completed NCT01222728 - Using Positron Emission Tomography to Predict Intracranial Tumor Growth in Neurofibromatosis Type II Patients
Recruiting NCT06004440 - Real World Registry for Use of the Ion Endoluminal System
Active, not recruiting NCT05636696 - COMPANION: A Couple Intervention Targeting Cancer-related Fatigue N/A
Not yet recruiting NCT06035549 - Resilience in East Asian Immigrants for Advance Care Planning Discussions N/A
Recruiting NCT06004466 - Noninvasive Internal Jugular Venous Oximetry
Completed NCT02909348 - Immunophenotyping of Melanoma Patients on Treatment With Pembrolizumab