With the current state of technological advancement and knowledge in medical sciences, the unsaid belief held by the average patient is that doctors know it all. It therefore hits a rare disease patient hard to see this myth shattered upon their first visit to a clinic.

There are currently more than 6,500 reported rare diseases for which knowledge is scant and treatments unavailable. Although individually rare, together they are estimated to affect 350 million people worldwide, with 70 to 90 million in India. Most are caused by faulty genes; about 50-70% manifest in infancy, while others are adult-onset. Once symptoms appear, many progress rapidly, causing severe disability and/or shortened life spans.

A common feature is how little we know about these diseases. Misdiagnosis is rampant because most doctors encounter such patients infrequently.

The diagnostic maze

Abha (name changed), who is affected by GNE myopathy—the rare disease we work with—had to live with misdiagnosis for eight years. How she finally got the correct diagnosis through her own efforts is representative of the experience of many rare disease patients.

Abha noticed her first symptoms of muscle weakness in 2006. She had difficulty rising from the floor and was not walking steadily at 26. As this happened soon after childbirth, and her EMG and spine MRI were normal, the neurologist attributed it to general weakness and advised calcium and vitamin D.

When the weakness increased, she visited a second neurologist at Gangaram Hospital, New Delhi. An abnormal EMG led the doctor to suspect Myasthenia Gravis, an autoimmune condition affecting neurotransmission. Medication produced no improvement. Being from a science background, Abha read about MG and felt that her symptoms did not match.

At AIIMS, New Delhi, a muscle biopsy showed atrophic muscle fibres. The doctor correctly concluded that her condition was related to muscle rather than nerve, but could only provide a tentative diagnosis of sarcoglycanopathy, a type of limb girdle muscular dystrophy.

In 2008, another renowned neurologist confirmed that she had a myopathy but believed it to be dysferlinopathy, another genetic disease under the LGMD umbrella. Abha remained dissatisfied because no genetic testing had been done for a confirmatory diagnosis. She searched the internet, found a US-based foundation working on dysferlinopathy and sent them her serum sample for DNA testing. The result was negative.

Her disease continued to progress, leaving her increasingly dependent on others for daily activities. Yet she remained ignorant about the medical name of her condition. Most frustratingly, she had never met another person with the same disease, and no doctor could connect her to such patients.