Using HIV to cure leukemia? Maybe. Immune boost is key

December 11, 2012 | by

On the surface, the idea of using HIV to treat leukemia might seem far-fetched, but researchers from the University of Pennsylvania were recently able to harness HIV's ability to infect white blood cells, developing what seems to be a cancer cure – or at least total remission – for a handful of patients. And they're not alone in using this increasingly promising approach.

The Pennsylvania team's HIV-based treatment, presented at the American Society of Hematology meeting and reported this week by the New York Times, is a new addition to the numerous treatments in development using T cells, a type of white-blood cell. Known as immunotherapeutics, these therapies use a patient's own immune system to fight disease.

At City of Hope, the Department of Cancer Immunotherapeutics and Tumor Immunology is developing T cell-based immunotherapeutics against brain tumors, lymphoma and breast cancers.

HIV-infected T cells

HIV-infected T cells, shown here under high magnification, may become a powerful new cancer treatment. (Image credit: Comstock)

Such therapies  are most often aimed at rebooting the body's immune system to overcome cancer cells' abilities to evade identification, attack and eradiation; the therapies also boost production of immune cells, further helping overwhelm the cancer.

The University of Pennsylvania's leukemia treatment gets a boost from  HIV's ability to infect cells, which helps spread the treatment throughout the body.

In the case cited by the New York Times, researchers reprogrammed T cells from then-6-year-old Emma Whitehead using neutered HIV – its infection prowess untouched but its disease genes replaced with anti-cancer genes. When the cells were reinfused into Emma, the viral package infected the other T cells in Emma's body, creating a new army of leukemia-targeted T cells that destroyed her cancer.

Twelve patients, including Emma, were treated with the HIV immunotherapeutic, but not all patients experienced remission of their cancers. One patient experienced a cancer recurrence.

In fact, although Emma's results were positive, she did endure harrowing fevers and chills – and dangerous blood pressure drops – during treatment, prompted by her rebooted immune system. More research is needed to understand why treatment results varied.

City of Hope's own immunotherapy research has identified cancer-specific receptors that can be used to target treatment, discovered specific T cells that can track down cancer cells hiding in lymph nodes, and opened clinical trials using central memory T cells to potentially provide immunity against cancer relapse. Stephen J. Forman, M.D., chair of City of Hope's Department of Hematology & Hematopoietic Cell Transplantation and the Francis and Kathleen McNamara Distinguished Chair in Hematology and Hematopoietic Cell Transplantation, is leading clinical trials on these immunotherapeutics.

“Our use of central memory T cells as part of an autologous transplant is unique to our therapy and sets our approach apart from other T cell treatments in development,” said Forman in a previous interview. “Central memory T cells have the potential to establish a persistent, lifelong immunity to help prevent recurrence of lymphoma after [a bone marrow] transplant.”

For more on cancer immunotherapeutics, visit the City of Hope's Cancer Immunotherapeutics Program online.

  • brynmawrmed at aol

    One more note to my comment: The paradigm described may also apply to other diseases or processes (eg influenza and immune response). –RJ

  • ZonkerPA

    Does anyone know is this the first time HIV-infected cells have been used in gene therapy? I'm a medical novice, but find this intriguing as hell, thanks!

    • H. Chung So

      While still relatively new in the history of medicine, modified HIV has been tested as gene therapy for over a decade; here's a NY Times story about it from 1999

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    Does anyone know is this initially HIV-infected tissues have been used in gene therapy? I'm a healthcare beginner, but discover this fascinating as terrible, thanks!

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