A Novel Cell Therapy Untested in Humans Saves a Baby With Cancer

Mangalore Today News Network

Nov 06, 2015: A baby girl who was close to dying from cancer has been rescued by a cell therapy envisioned as a "one size fits all" treatment that had never been tested in people, doctors reported on Thursday.

 

The development is significant because it indicates that cell therapies, which represent an exciting new front in the battle against cancer, might not have to be customized for each patient, saving time and money.

It also represents one of the first times that a novel "genome editing" technique has been used to treat someone. The therapy was developed by Cellectis, a French biotechnology company.

But it is hard to say much based on one patient. Also, the girl has been in remission for only a few months, too little time to say she has been cured, said Waseem Qasim, one of the doctors who treated her at the Great Ormond Street Hospital in London.

Still, the girl’s doctors "think it is a remarkable outcome," because she had not been helped by conventional therapies, Qasim said in an interview.

Cancer doctors have been electrified by a new approach that involves genetically altering patients’ T cells, the soldiers of the immune system, so that they can better attack cancers.

Some patients with certain blood cancers have made remarkable recoveries. They include a girl who received a treatment developed at the University of Pennsylvania and now licensed to Novartis. Other companies pursuing this approach, often called CAR-T, including Juno Therapeutics and Kite Pharma, have achieved large stock market valuations.

But the first versions of their experimental therapies require extracting the T cells from the patient, shipping them to a manufacturing plant where they can be altered, then sending them back and putting them back into the patient, something that will be logistically challenging and costly for thousands of patients. Cellectis’ therapy is meant to work for any patient with a particular type of leukemia.

Cellectis’ American depositary receipts soared 18 percent on Thursday, while shares of Juno fell 7 percent and those of Kite dipped 2 percent.

Still the personalized treatments could reach the market in the next couple of years, long before Cellectis’ treatment, which will not even enter early-stage clinical trials until next year.

The case of the girl’s recovery will be presented to doctors next month at the annual meeting of the American Society of Hematology in Orlando, Florida. But abstracts for that conference were made public Thursday, and the hospital publicized the case.

The girl, Layla Richards of London, had acute lymphoblastic leukemia. Doctors tried the usual chemotherapy, a bone marrow transplant and a new type of biotech drug, but nothing worked. Layla did not have enough T cells to allow doctors to extract them and make a personalized therapy.

Her parents, Ashleigh Richards and Lisa Foley, were counseled to consider palliative care to keep her comfortable until she died, Qasim said. But the parents were not willing to do that.

In what might be a lucky coincidence, the hospital was already manufacturing Cellectis’ cells in preparation for clinical trials. "We had them in our freezers," Qasim said. He is also a professor at University College London, which worked with Cellectis on the treatment.

So, with permission from her parents and Cellectis, Layla became the first person to receive the treatment, on what is sometimes called a compassionate use basis.

After getting the cells around the time of her first birthday in June, Layla went into remission, with no trace of leukemia found in her blood or bone marrow. She later had a second bone marrow transplant to help her immune system recover and is now at home.

Cellectis’ therapy uses T cells from a healthy donor that are first modified to target leukemia cells in much the same way Novartis and the others modify a patient’s own cells.

But to make its treatment "universal," Cellectis than takes another step using another new technology that is generating huge excitement - genome editing. This refers to using molecular scissors to make precise changes to DNA, just as one might edit a word in a document. The genome editing technique that has gotten the most attention is known as CRISPR-Cas9, though Cellectis used an older approach known as Talens.

A big concern with a nonpersonalized therapy is that the transplanted T cells will recognize the patient’s own cells as "foreign" and attack them. Cellectis used genome editing to knock out a gene so the transplanted T cells could not do that. It also inactivated another gene to help the transplanted T cells survive in the patient’s body.

Servier, a French drug company, is working with Cellectis on this treatment. Cellectis also has a partnership with Pfizer.

In other news related to the hematology conference, shares of Bluebird Bio sank 22 percent on Thursday when an abstract suggested that its experimental gene therapy for the rare blood disease beta thalassemia would not work as well in the most severely ill patients as it had in less severe cases.

 

Courtesy: NDTV