Kailee Wells - the six-year-old whose adoptive mother travelled from America to China this year in search of relatives for a bone marrow transplant - is back in hospital after radical treatment apparently failed. Kailee, who suffers from severe aplastic anaemia, will undergo a bone biopsy this week to shed further light on her fading condition. 'So far the results have been disappointing,' said her adoptive father Owen Wells, of Albuquerque, New Mexico. 'And her blood tests - which she has once or twice a week, depending on how grave or good they are - were at an all-time low recently. Not good news.' Doctors said that without a miracle breakthrough, Kailee now has just weeks, not months, to live. She has been kept alive by chemotherapy, steroids and a cocktail of drugs but needs a bone marrow transplant from an exact DNA match to survive. The best chance of finding a match is from a member of her biological family. Kailee was abandoned when she was 10 days old - left on the doorstep of a now demolished teachers' college in Changde, Hunan. Her plight was first reported in the South China Morning Post, and captured national and international attention when her American mother Linda Wells travelled to the mainland in February to search for the biological family. Mrs Wells appealed to Kailee's birth mother to come forward, and Chinese authorities said they would make an exception and not impose penalties on the mother for abandoning the baby girl. Despite the public's overwhelming response - more than 20,000 people came forward and offered to be tested - no matches were found. Mr Wells said Kailee was accepted into an experimental programme using the drug Zenapex, because previous treatments had failed. But the new drug did not improve her condition. He said Kailee and her mother were going back into specialist care in Bethesda, Maryland. 'We will also be going to learn about another, more dangerous, treatment ... We are not eager to consider it. However, we need to know all of our options,' he said. 'We continue to encourage more bone marrow drives and I sent off three letters to the Chinese Red Cross in the hope of at least finding out if our China drive will yield a match. 'I keep hoping to hear ... but we never have. I understand Sars was a major issue that they had to deal with, however, Kailee's clock keeps ticking and the remaining time to treat her is limited.' Hong Junling, who helped co-ordinate the national search through the China Red Cross in Beijing, said: 'Although the volume of our stored marrow has increased to 80,000, there is still no [donor] suitable for Kailee Wells.'