Certain DNA changes linked to development and lethality of prostate cancer
A new analysis has found that the loss or amplification of particular DNA regions contributes to the development of prostate cancer, and that patients with two of these DNA changes have a high likelihood of dying from the disease. The study provides valuable information on the genetics of prostate cancer and offers insights into determining which patients should be treated aggressively.
Cells can become cancerous when they lose or amplify pieces of DNA containing important genes. Using a method that can detect these genetic changes in cells from prostate tumors from 125 patients, Jianfeng Xu, MD, DrPh, Director of the Center for Cancer Genomics at the Wake Forest School of Medicine in Winston-Salem, North Carolina, and his colleagues found that changes in 20 gene regions likely contribute to prostate cancer development. Four of these regions had not been reported before. Importantly, changes in seven of the 20 regions were linked with early death from prostate cancer.
Patients whose cancer cells had a loss of the PTEN gene and an amplification of the MYC gene were more than 50 times as likely to die from prostate cancer than other patients who had similarly staged tumors and similar levels of prostate-specific antigen at the time of diagnosis. Analyses of 333 tumors from additional patients confirmed the link between PTEN and MYC and prostate cancer lethality. The findings from this study were published in Cancer (2013; doi: 10.1002/cncr.27954).
In addition to providing new information about the genetic changes involved in the development and progression of prostate cancer, the findings may help guide doctors as they weigh different treatment options for patients with the disease."For example, prostate cancer patients who have DNA copy number alterations at PTEN and MYC may not be appropriate candidates for active surveillance and should be treated intensively," explained Xu.