BISPHENOL or BPA, organic compound C15H16O2, which is made up of two concatenated phenol organic groups, from which its name derives. Exposure is dangerous to the fetus during pregnancy, with the risk of diabetes and heart disease once born. The presence of BPA is associated with increased allergies, thyroid problems, obesity, anxiety, aggressiveness, hypertension, increased heart disease, in addition to having correlation with prostate and breast cancer. BPA is a substance used in radiation therapy in a procedure called boron neutron capture therapy. BPA is injected into a blood vessel and accumulates in tumor cells. The patient then receives radiation therapy with neutron bombardment.