taking a harder look at this pic reveals an interesting underlying genetic organization.
there are three 'common genetic factors', and these are described as Ac1, Ac2, and Ac3.
in addition, there are unique genetic factors associated with most but not all disorders.
Ac1 most strongly affects: (attention seeking)
paranoid = .30
histrionic = .49
borderline = .32
narcissistic = .35
dependent = .29
obsessive = .29
Ac2 most strongly affects: (antisocial)
borderline = .43
antisocial = .63
Ac3 most strongly affects: (avoidant)
Schizoid = .37
Avoidant = .59
if you consider that each of the common factors also has a single disorder associated that does not include a specific genetic factor (As=0), then that disorder can be considered the 'archetype' for the common factor. so you have the histrionic factor (which i have called attention seeking), and you have the antisocial and avoidant common factors. By this criterion, an antisocial is 'created' in an individual with the Ac2 common factor, and when the environment is suitable for his/her development down this path. The borderline has the same antisocial common factor, but also has the attention seeking common factor and an independent 'unique' As factor specific for this disorder.
that is my interpretation of this data, and also describes how the personality disorders could be clustered, with some disorders relating genetically (and therefore, neurochemically or neurostructurally) to each other. it would be predicted that disorders that have similar underlying genetic causes would be treated pharmaceutically/therapeutically in similar ways.