1. Old article, and the numbers are very bad. A few years later, in the late 1990s, Lynn Conway did something exceedingly simple - she asked the SRS surgeons in the US how many patients they had processed over the prior 20 years. The numbers indicated something over 33,000 SRS patients had already been processed and were likely still alive. That's three times the number in that article, but back then they assumed the incidence of being trans was far too low.
2. The numbers Lynn Conway researched did not include any US citizens who had gone overseas, something that we know may be as much as half of all US trans women or more.
3. Here's an actual slide of the BSTc (bed nucleus of the stria terminalis). Note the four categories included. I know some macho heterosexual men who were openly offended at the notion that somehow, in any way at all, gay males might be "more male" than them, yet this slide says exactly that. And it says trans women have BSTcs like cisgender women.

4. Some of you are arguing there should be additional data about brain differences? There is! Here's a partial list that I maintain. If you become aware of other such studies, please let me know and I'll add them to the list!
One Stop Trans Brain Research List5. As for studies "proving the opposite" about the biological basis for us being trans, that's not happening. They don't exist. The studies are piling up on one side of the aisle, showing a medical, neurobiological basis for being trans, and that the reason trans women are trans is because we have important brain structures that are female in structure, not male.

No other competing theory currently has any laboratory backed data supporting it. None.
This is why the American Psychiatric Association, the American Medical Association, and now the American College of Physicians all recognize being trans as a medical condition, that the condition has a neurobiological basis, and that for those suffering from extreme GID, transitioning is the one agreed upon treatment method that consistently works to a very high degree.