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Tailor-made Cancer Treatment for Multiple Myeloma Patients Offered by Mayo Clinic

Mayo Clinic Cancer Center, has singled out tumor specific alterations in cellular pathway by which drug bortezomib (Velcade) works.// This drug is administered to patients suffering from multiple myeloma.researchers have identified almost nine genetic mutations in cancer cells that might improve chances of patients responding to the agent.

These findings may help physicians to frame tailor treatment to patients with multiple myeloma, considered to be a cancer that is hard to treat.Multiple Myeloma affects plasma cells of the blood,and is the second most common blood cancer encountered in the United States. "Bortezomib seems to work in about one-third of patients who use it, but we have not been able to predict which ones," says the study's lead author, Leif Bergsagel, M.D., a hematologist at Mayo Clinic Arizona. "We now have identified a group that will likely respond because these nine mutations seem to be present in at least 25 percent of newly diagnosed patients.

"Now that we know the pathway the drug targets, and genetic mutations within this pathway that make patients respond better, we are working on a simple way to select those patients who are the best candidates for use of bortezomib," says Dr. Bergsagel.

In 2003, after only a four-month review, the Food and Drug Administration (FDA) approved use of bortezomib in patients who have failed other treatments for multiple myeloma. Later studies showed it lengthened survival by as much as six months. The drug was the first approved in a new class of agents known as proteasome inhibitors. Proteasomes are large protein groups inside cells that break down other proteins. Agents that inhibit the proteasome cause a buildup of proteins that affect many signaling cascades (various necessary biological processes). Bortezomib was initially thought to exert its activity by disrupting one of two known NF-êB (Nuclear Factor kappa B) pathways which keep cancer cells from self destructing t
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