Her 18-year-old son Jermarl Henderson, who has a chromosomal disorder called DiGeorge Syndrome, has had multiple open-heart surgeries and requires intensive, complex therapy, she said.

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The Jubilee Rehabilitation Complex includes a therapy building, radiology department and a flat where patients can learn to live independently.

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Gene therapy could be the most complex biologic of all, reckons Dr High.

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But she added it was too complex to say GPs were turning against the therapy, suggesting collection methods may miss some homeopathy therapies.

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And, says Knaysi, not only has medicine gotten much more complex with "a huge menu of options" for testing and therapy, but the fear of lawsuits has become ingrained in both doctors' and hospitals' minds.

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The simple therapy has proven useful with other syndromes that have perplexed doctors such as Complex Regional Pain Syndrome, a term for unexplained pain.

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For years biologists have figured the aging process is so complex it must involve thousands of genes, too many to offer an effective targeted therapy.

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