Sex hormone-binding globulin (SHBG) is thought to mainly function as a transporter and reservoir for the estradiol and testosterone sex hormones. However it has also been demonstrated that SHBG can bind to a cell surface receptor (SHBG-R). The SHBG-R has not been completely characterized. A subset of steroids are able to bind to the SHBG/SHBG-R complex resulting in an activation of adenylyl cyclase and synthesis of the cAMP second messenger.  Hence the SHBG/SHBG-R complex appears to act as a transmembrane steroid receptor that is capable of transmitting signals to the interior of cells.
So why all the panic? Well, the effects of different types of radiation are difficult to explain to the layperson, and when you have the queen of the Uruk-hai (aka Nancy Grace ) belching out a cloud of undiluted, pants-shitting sensationalism, it's easy to see how misinformation can spread so quickly. But while the press had a field day comparing the accident to Chernobyl, in reality it wasn't nearly as bad . As a matter of fact, Japanese officials are already starting to permit people to return to their homes and businesses , and looking back now, it turns out that the workers were never really in much danger .
If the scar tissue in FM is localized, and in the form of a mass, surgical resection may improve symptoms, but is very high risk and appropriate for very few patients. This option may require extensive reconstruction of the vascular or airways structures. Procedures of this nature are only offered at a few medical locations. This is not a preferred method of treatment and should only be used in the most extreme cases due to a high level of morbidity and mortality. Very rarely, surgical reconstruction of serious airway obstruction may be life-saving, but should only be done by thoracic surgeons who are very experienced with fibrosing mediastinitis.