8p23.1 duplication syndrome is a rare genetic disorder caused by a duplication of a region from human chromosome 8. This duplication syndrome has an estimated prevalence of 1 in 64,000 births  and is the reciprocal of the 8p23.1 deletion syndrome. The 8p23.1 duplication is associated with a variable phenotype including one or more of speech delay, developmental delay, mild dysmorphism, with prominent forehead and arched eyebrows, and congenital heart disease (CHD). Presentation
The phenotypic data on 11 patients indicated that cases are not always ascertained for CHD but that CHD was the most common single feature found in 6 out of 11 individuals. Developmental delay and/or learning difficulties were found in 5 out of 11 cases, but one prenatal case was developing normally at 15 months of age (Case 1,). Three other prenatal cases could not yet be reliably assessed. A variable degree of facial dysmorphism was present in 5 out of 11 individuals. Partial toe syndactyly has been found in one mother and son diad and adrenal anomalies in two probands but not in the duplicated mother of one of them. The phenotype is compatible with independent adult life with varying degrees of support. Duplication of the GATA4 transcription factor (OMIM: 600576) is believed to underlie the congenital heart disease and other genes, common to the duplication and deletion syndromes, can be regarded as candidates for the 8p23.1 duplication syndrome. These include the SOX7 transcription factor (OMIM: 612202) for both CHD and developmental delay  and the TNKS gene (OMIM: 603303) for behavioural difficulties.
Incidence of mesothelioma lags behind that of asbestosis due to the longer time it takes to develop; due to the cessation of asbestos use in developed countries, mesothelioma incidence is expected to decrease. Incidence is expected to continue increasing in developing countries due to continuing use of asbestos. Mesothelioma occurs more often in men than in women and risk increases with age, but this disease can appear in either men or women at any age. Approximately one fifth to one third of all mesotheliomas are peritoneal. Less than 5% of mesotheliomas are pericardial. The prevalence of pericardial mesothelioma is less than 0.002%; it is more common in men than women. It typically occurs in a persons 50s-70s.Between 1940 and 1979, approximately 27.5 million people were occupationally exposed to asbestos in the United States. Between 1973 and 1984, the incidence of pleural mesothelioma among Caucasian males increased 300%. From 1980 to the late 1990s, the death rate from mesothelioma in the USA increased from 2,000 per year to 3,000, with men four times more likely to acquire it than women. More than 80% of mesotheliomas are caused by asbestos exposure.The incidence of peritoneal mesothelioma is 0.5–3.0 per million per year in men, and 0.2–2.0 per million per year in women. UK
Mesothelioma accounts for less than 1% of all cancers diagnosed in the UK, (around 2,600 people were diagnosed with the disease in 2011), and it is the seventeenth most common cause of cancer death (around 2,400 people died in 2012).