I remember many lessons on 2nd Timothy 2:15 "Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth". It was presented to me recently that a new article had surfaced "showing there is no scientific evidence of Transgenderism". It was supposed to have been written by 2 professors from Johns Hopkins University. That lesson growing up rang in my head so I went in search. The article I found was posted on "The New Atlantis" and titled Sexuality and Gender.
written by Lawrence Mayer and Paul McHugh.
The section of importance to me was part 3 on gender identity (page 86). After having read this article, I see where there is opportunity for more research, however no evidence stating that Gender Identity, Gender Disphoria, or transexualism has no scientific basis.
Sources and 3rd party reviews are listed below.
http://www.thenewatlantis.com/docLib/20160819_TNA50SexualityandGender.pdf McHugh, Mayer