I had the privilege of having a whole Sunday last week where I had time to do whatever I wanted. I chose to watch a box office movie called The Danish Girl.
It as based on a real story (although it clearly has been embellished) of a married couple, Einar and Gerda and their journey in finding Einar's true sexual identity.
They are both young artists, living in Denmark in the 1920s and as the movies opens, portrays them as a sexually compatible and happy couple. Their world changes as Gerda asks Einar, as a favour, to act as her model and dress up in ballet dancer's  clothing. This is Einar's epiphany - he realizes who he really is ( a women hiding in his male body) and realizes that the world, as he knows it, will fundamentally change.

The "Berlin Patient" as he is known had HIV since 1995. He is a homosexual who was diligently on ARV medication for many years and kept to himself living a quiet and private life in Germany. Hence the alias.

In 2006/2007 he developed the most common blood cancer in adults called Leukemia.
Chemotherapy didn't help and his last chance was a stem-cell transplant from a bone marrow donor. So far, nothing is unusual in this line of treatment.
His oncologist who specialized in blood cancer Geto Hütter had a brain wave; he remembered that people with a natural genetic mutation called delta 32 disabled or stopped CCR5. This is a protein found on the very cells which is the pathway of HIV into human bodies.
If both parents have this CCR5 genetic mutation, early research showed that people with this mutation were immune to getting HIV. What was fascinating is that this genetic condition seems to occur only in Northern Europe which includes Germany.