The US American Health Hazard Evaluation (HHE) Program evaluated ongoing
concerns about a possible high rate of cancer among current and former
employees in two office buildings at an aeronautics research center.
Investigators found that 20 different types of cancer were diagnosed among the
employees of the two buildings, but the different types of cancers did not
suggest a common workplace exposure among those diagnosed.

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AplusA-online.de - Source: National Institute for Occupational Safety and Health (NIOSH)