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Boston -- A team of Dana-Farber Cancer Institute investigators discovered that a subset of myeloid and lymphoid leukemias depend on a molecular complex called PI3Kgamma for survival.

"Evidence in humans indicates that exposure to ethylene oxide increases the risk of lymphoid cancer and, for females, breast cancer," the EPA wrote in 2018.

For example, certain genes are associated with the production of lymphoid cells, others with myeloid cells, and still others with a healthy balance of various immune cell types.

The results show a clear association between the total radiation doses to the bone marrow from CT scans and the risk of developing both myeloid and lymphoid malignancies.

The Trump administration, bowing to industry pressure, ignored federal scientists and adopted weaker standards for regulating emissions of ethylene oxide, a hazardous air pollutant that could pose a risk of lymphoid and breast cancer.