Brisbane — International Olympic Committee chief Thomas Bach on Monday called the controversial gender case of runner Caster Semenya “extremely complicated and delicate” and said an expert panel will study its implications. Two-time Olympic champion Semenya last week lost a court challenge against the International Association of Athletic Federations (IAAF) over plans to force some women to regulate their testosterone levels. The decision by the Court of Arbitration for Sport means female athletes with elevated testosterone will have to take suppressive treatment if they wish to compete as women in certain events. The IAAF argued that “hyperandrogenic” athletes — or those with “differences of sexual development” (DSD) — had an unfair advantage over others. Bach said in Brisbane that the IOC would create a group of “experts from science, ethics as well as athletes’ representatives and from international federations” to examine the ruling. It will include IOC medical director Richa...

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