Occupational risk for hematological malignancies

Our plain-English summary of Occupational risk for hematological malignancies, by P. Pasqualetti, R. Casale, D. Colantonio, et al (American Journal of Hematology, 1991).

The study

• Authors: P. Pasqualetti, R. Casale, D. Colantonio, A. Collacciani
• Journal: American Journal of Hematology
• Published: 1991;38(2):147-9
• Cited by: 50 articles, as counted by NIH iCite
• Read it: PubMed · Publisher

Abstract

A case-control study was conducted in 620 cases of hematological malignancies and in 1,240 age- and sex-matched controls in order to verify the possible association between occupation, toxic substances exposure, and the risk of hematological neoplasias. The results demonstrate that farmers and industrial workers have a significant risk for hematological malignancies. Exposure to asbestos, aromatic hydrocarbons, fertilizers, mineral oils, pesticides, and radiations is associated with a significant increase in the risk for these malignant diseases. These data are in agreement with previously reported data, and require a confirmation in larger, prospective studies.

In plain English

This Italian case-control study compared 620 people with blood cancers with 1,240 hospital patients of the same sex and age who did not have cancer. The cancers included leukemias, lymphomas, myeloproliferative and myelodysplastic syndromes, and malignant monoclonal gammopathies, which were mostly multiple myeloma. The subjects, or their relatives, were interviewed about their jobs and about whether they had ever been exposed to substances on a list. Asbestos was one item on that list. The article does not describe fiber types or amounts. People who reported asbestos exposure had higher odds of a blood cancer (odds ratio 3.04, 95% confidence interval 1.79 to 5.14). By disease, asbestos was significantly associated with malignant monoclonal gammopathies (odds ratio 4.61, 95% confidence interval 1.63 to 12.30) and with chronic lymphocytic leukemia (odds ratio 4.71, 95% confidence interval 1.23 to 18.05). The study also reported significant associations for farming, industrial work, aromatic hydrocarbons, fertilizers, mineral oils, pesticides and radiation. The authors concluded that larger prospective population-based studies are needed to assess the strength of any association.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Hospital-based case-control (case-referent) study with matched-pair analysis
• Who was studied: 620 people with hematological malignancies (355 males, 275 females, aged 24 to 85) and 1,240 sex- and age-matched hospital controls. The controls came from the same geographic areas and had medical diseases other than cancer or congenital diseases. The cases were 59 acute non-lymphoblastic leukemia, 29 acute lymphoblastic leukemia, 65 chronic lymphocytic leukemia, 69 Hodgkin disease, 108 non-Hodgkin lymphoma, 44 myeloproliferative syndromes, 48 myelodysplastic syndromes, and 198 malignant monoclonal gammopathies (190 multiple myeloma, 8 Waldenstrom's macroglobulinemia). The authors were from the University of L'Aquila and the General Hospital of Avezzano, Italy. Study dates are not given. Interviews were obtained directly from 366 of 620 cases (59%) and from 1,054 of 1,240 controls (85%); for the others, relatives gave the information.
• Exposure: Self- or proxy-reported current or previous occupation, and ever-exposure to items on a list of toxic substances, grouped into 21 categories. Asbestos was one category. Fiber type, duration and dose are not described.
• Main results:
  • All hematological malignancies combined: asbestos exposure had an odds ratio of 3.04 (95% CI 1.79 to 5.14), P less than 0.001. These values were read from an OCR-scrambled table row.
  • Malignant monoclonal gammopathies: asbestos had an odds ratio of 4.61 (95% CI 1.63 to 12.30), P less than 0.02.
  • Chronic lymphocytic leukemia: asbestos had an odds ratio of 4.71 (95% CI 1.23 to 18.05), P less than 0.05.
  • All hematological malignancies combined: significant associations (P less than 0.05) for asbestos, fertilizers, aromatic hydrocarbons, mineral oils, pesticides and radiation.
  • Occupations: cases included a significant excess of people employed in agriculture and in industry.
  • Work in agriculture was significantly associated with each of the hematological malignancies.
• The authors' conclusion: The authors concluded that these substances might deserve further attention in occupational studies of workers. They said larger, prospective, population-based studies are warranted to assess the strength of any association.
• Limitations the authors state:
  • The authors acknowledged the potential limitations of case-referent studies in general, without detailing them.

Topics

Medical terms in this study, explained in our Lexicon: Case-Control Study.

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