A breath test to detect lung cancer and its stage?
18 Jun 2014
A new device may accurately detect lung cancer and its stage, just by breathing into it, since it can detect specific characteristics of breath compounds.
New hope against poor detection rates of lung cancer
The reason for the striking mortality rate of lung cancer is simple: poor detection. Lung cancer attacks without leaving any fingerprints, quietly afflicting its victims and metastasizing uncontrollably -- to the point of no return.
Now a new device developed by a team of Israeli, American, and British cancer researchers may turn the tide by both accurately detecting lung cancer and identifying its stage of progression. The breathalyzer test, embedded with a "NaNose" nanotech chip to literally "sniff out" cancer tumors, was developed by Prof. Nir Peled of Tel Aviv University's Sackler Faculty of Medicine, Prof. Hossam Haick (inventor) of the Technion -- Israel Institute of Technology, and Prof. Fred Hirsch of the University of Colorado School of Medicine in Denver.
The study, presented at a recent American Society of Clinical Oncology conference in Chicago, was conducted on 358 patients who were either diagnosed with or at risk for lung cancer.
The "smell" of cancer
"Lung cancer is a devastating disease, responsible for almost 2,000 deaths in Israel annually -- a third of all cancer-related deaths," said Dr. Peled. "Lung cancer diagnoses require invasive procedures such as bronchoscopies, computer-guided biopsies, or surgery. Our new device combines several novel technologies with a new concept -- using exhaled breath as a medium of diagnosing cancer.
"Our NaNose was able to detect lung cancer with 90% accuracy even when the lung nodule was tiny and hard to sample. It was even able to discriminate between subtypes of cancer, which was unexpected," said Dr. Peled.
Lung cancer tumors produce chemicals called volatile organic compounds (VOCs), which easily evaporate into the air and produce a discernible scent profile. Prof. Haick harnessed nanotechnology to develop the highly sensitive NaNose chip, which detects the unique "signature" of VOCs in exhaled breath. In four out of five cases, the device differentiated between benign and malignant lung lesions and even different cancer subtypes.
The bigger the tumor - the more robust the test
"Cancer cells not only have a different and unique smell or signature, you can even discriminate between subtypes and advancement of the disease," said Dr. Peled. "The bigger the tumor, the more robust the signature."
The device and subsequent analysis accurately sorted healthy people from people with early-stage lung cancer 85% of the time, and healthy people from those with advanced lung cancer 82% of the time. The test also accurately distinguished between early and advanced lung cancer 79% of the time.
"The device could prove valuable in helping determine patients who need more intensive screening for lung cancer," said Dr. Peled. "We're hoping to have a device that would be able to give you a go/no-go result -- something's wrong, go get an X-ray."
The Boston-based company Alpha Szenszor has licensed the technology and hopes to introduce it to the market within the next few years. Meanwhile, a new, smaller version of the device has since been developed that can plug into a computer's USB port.
Source: Science Daily