Looking Under the Hood of Aggressive Leukemia

By Julie Grisham,

Tuesday, May 26, 2015

Ross Levine

Physician-scientist Ross Levine is studying the genetic mutations that underlie certain types of leukemia to learn about how they make the cancer cells more aggressive — and about how these cancerous cells could be made to revert back to normal.

  • Genetic changes can cause normal blood cells to become leukemia.
  • Studying these genetic changes teaches us how leukemia develops.
  • Epigenetic changes are linked to many types of leukemia.
  • Efforts to reverse these mutations may lead to new therapies.

All the cells in your body have the same DNA, but they express — turn off or on — different genes depending on their function. Studying how the “wrong” genes are sometimes activated in cells can teach us a lot about what causes cancer to develop and also suggest ways to treat it.

Memorial Sloan Kettering physician-scientist Ross Levine has dedicated his career to treating patients with leukemia and other blood disorders and to studying the genetic changes that cause normal blood cells to become cancerous.

MSK researchers are studying genetic changes that turn normal cells into cancerous ones.

“What we like to do in my lab is to open up the hood and examine the circuitry of the leukemia, in a way that hopefully can tell us what makes this cancer tick,” explains Dr. Levine, an investigator in the Human Oncology and Pathogenesis Program.

His latest study, published recently in the journal Cancer Cell, has revealed important insights about how different mutations act together to distort a blood cell’s identity and make leukemia more aggressive — and it has also yielded clues about how drugs could reprogram these cancerous cells back to normal.

Focus on Cancer Epigenetics

What Dr. Levine has discovered — along with other investigators at MSK and elsewhere — is that many of the genes that are mutated in leukemia encode for proteins that control epigenetic processes. Epigenetics refers to information that can be passed down from parent cell to daughter cell but is not encoded in the DNA sequence, meaning that it’s not hereditary. Epigenetic changes are linked to many types of cancer because when cells don’t express the right gene at the right time, uncontrolled growth often results.

MSK is devoting considerable efforts to the study of epigenetics, one of the fastest-growing fields of cancer research, including through the recent establishment of the Center for Epigenetics Research, headed by physician-scientist Scott Armstrong.

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Answering the Fundamental Questions

Dr. Levine’s work aims to answer central questions about leukemia: “What are the specific genes and proteins that are mutated, and how do those mutations actually cause the leukemia?” he asks. “More importantly, what happens when you reverse the effects of those mutations?”

Earlier research from his team examined samples from more than 500 patients with acute myeloid leukemia (AML) and determined that certain combinations of gene mutations could be used to predict which patients would respond to traditional chemotherapy and which had more aggressive disease that would require a different approach.

Treatment of more aggressive disease may require a new approach.

Based on findings from that study, the team engineered mice with gene mutations that mimicked this more aggressive form of disease. In the current study, the researchers developed a new AML mouse model to figure out how these combinations of mutations function to change the epigenetics of the leukemia cells.

“When these mutations work together, they’re telling the cells not to use the normal genes that are important for the normal behavior of blood cells,” Dr. Levine says. “The cells forget their identity and don’t do the things they’re supposed to do.”

The investigators were then able to put back a silenced gene and study the outcome. “What was remarkable was that the leukemia cells didn’t die — they recovered their normal behavior and became normal cells,” he says. “The cells slowly went away, and the mice no longer had leukemia.”

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Reprogramming Diseased Cells

Dr. Levine’s lab is now focused on finding drugs and other approaches that will enable them to reeducate and reprogram leukemia cells. Several clinical trials at MSK are already using a similar tactic, and early results are promising.

In addition, the researchers are looking at ways these cells can be eliminated once they are reprogrammed to be less harmful and easier to attack.

“This research shows how we can use state-of-the-art epigenetic technologies to uncover the wiring of these cells, and then show that by restoring the normal wiring, we can actually change their behavior,” he concludes. 

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This research was supported by a Gabrielle’s Angel Foundation for Cancer Research grant, the Leukemia and Lymphoma Society, the National Cancer Institute under grant CA172636-01, and the Samuel Waxman Cancer Research Center.


Keep up the good work.

I have PV dx 2years ago. No problems with treatment . I have read there is a 6 % chance of progressing to AML after 10 years-not high but I would like to donate money to this cause or lab .
How can I do this? Thank you for your research -Marion Davis -Canberra Australia.

Dear Marion, thank you for considering a gift to support our research. Learn more about ways to donate by visiting our giving pages at http://giving.mskcc.org/. If you would like to speak with someone directly in our Development office, please call 866-815-9501 or email them directly at development@mskcc.org. We appreciate you reaching out to us.

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