Abstract
Chapter 1 discusses at length the origin of formaldehyde, emphasizing the role that this chemical plays in nature as well as its uses in industry and the health-care system. It discusses its economic importance in the world, including exposure and health effects that can occur after natural disasters, and in this chapter, the reader is given an initial glance to the controversy regarding the carcinogenicity of formaldehyde, although the meat of the arguments is kept for later chapters. The book is very focused in both China and USA as they are the largest producers of formaldehyde.
Chapter 2 deals with exposures and regulation throughout the world. This chapter is very useful to toxicologists interested in determining limits for exposure by different routes and in the different occupations that use formaldehyde for their work. It presents the differences in regulatory limits among different governmental organizations, not only between countries but also by different regulatory agencies within the same country, in the case of Canada and United States. Finally, there is a good discussion of the metabolism of formaldehyde.
Chapter 3 discusses formaldehyde exposure in China. Since there has been a rapid pace of industrial development in China in recent years, the increased use of formaldehyde has meant that more people are exposed. There are several well-researched tables indicating the multiple reports of exposure in the different industries, as well as exposure in the outdoors environment, and in different cities and venues. The conclusion of this chapter is notable for the statement that exposure in China far exceeds the regulatory exposure limits and the regulations are in need of enforcement.
Chapter 4 is an important source of information for physicians, pathologists, pharmacologists, and toxicologists. It deals with the toxic effects of formaldehyde, starting with the acute to the chronic effects of exposure and ending on the genotoxicity of formaldehyde. It is, like this entire book, thoroughly researched and factual. The section on genotoxicity is about half of this chapter for good reason as the mutagenic effects of formaldehyde are well known.
Chapter 5 follows up with analysis of the carcinogenicity of formaldehyde. This is a field fraught with controversy, and the author navigates the different opinions with skill giving due to the encountered arguments, but in the end making sure to find the facts. The carcinogenesis evidence is weighed and presented. Since the carcinogen classification is controversial, the author explains the importance of such classification by different international health organizations. Like every other chapter, this one has a good summary section, where the presented information is put into perspective and again the chapter is rich with references and documentation.
Chapter 6 continues with the carcinogenicity of formaldehyde and focuses on the leukemia risk after formaldehyde exposure. Multiple studies have been conducted over the years that were supported by different organizations, some of these studies have been actualized, and meta-analysis of these studies has been performed. In the summary, the author concludes that there is evidence for association of formaldehyde with myeloid leukemia.
Chapter 7, appropriately titled “Potential Mechanisms of Formaldehyde-induced Leukemia,” is a compilation of data supporting how formaldehyde can induce carcinogenesis. There are various hypotheses of the mechanism of production of leukemia and other cancer effects.
Chapter 8 is an analysis of the ways that formaldehyde induces aneuploidy, as a major mechanism of induction of leukemia. The data presented includes an analysis of the populations where the samples were collected for these studies and then discusses the different tests that were employed to document any effects. It concludes with a discussion of the potential mechanisms of aneuploidy.
Chapter 9 analyzes the data supporting the effect of formaldehyde in epidemiological studies performed in the United States, China, and the United Kingdom, supporting the potential role of this compound on the presentation of brain tumors. The conclusion is that there is significant evidence for increased brain tumors in pathologists, histologists, and embalmers, as compared to their cohorts. Although the incidence is low, it warrants taking measures to minimize exposure in the workplaces of these professionals.
Chapter 10 focuses on formaldehyde effects on neurodegenerative disorders, including memory and learning linked to formaldehyde-laced marijuana cigarettes and on to chronic illnesses such as Parkinson disease and dementia, it concludes with mechanistic analysis of formaldehyde effects on neurodegeneration.
Chapter 11 deals with the effects of formaldehyde on children. This chapter brings focus to the fact that children can be exposed to toxic and chronic levels of formaldehyde by different routes and that the effects are similar to the effects in adults, although the developing brain may be more susceptible to the toxic effects of this compound. There is also a good analysis of the possible role of formaldehyde on the production of asthma in children.
Chapter 12 is dedicated to the analysis of the reproductive effects of formaldehyde. It focuses on the epidemiology data, indicating effects of formaldehyde exposure on low birth weight and spontaneous abortions as well as teratogenic effects.
Chapter 13 focuses in analyzing the published evidence for reproductive effects in reproductive toxicology studies supporting reproductive effects.
Chapter 14 delves on mechanistic studies to explore the effects of formaldehyde exposure on reproductive and developmental functions. The information available seems to be slanted more to reproductive effects on males, but some of the data support effects in the conceptus.
Chapter 15 is entitled “Conclusions and Future Directions” and summarizes the salient concepts that were discussed in the previous chapters and its last section is a treasure trove of ideas to follow-up on the impact of formaldehyde and the issues that are most in need of clarification.
In summary, this is a well-researched and aptly presented book, which should be a staple in the scientific libraries of toxicologists, pathologists, regulators, and other professionals dealing with formaldehyde. Data are thoroughly referenced and intelligently analyzed. This is a real contribution to our fields of interest.
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