MRI screening program for persons at high risk of pancreatic cancer
A magnetic resonance imaging (MRI)-based screening program for persons at high risk of pancreatic cancer identified pancreatic lesions in 16 of 40 (40%) patients, of whom five underwent surgery, according to a report published online by JAMA Surgery (2015; doi:10.1001/jamasurg.2014.3852).
Pancreatic cancer is a leading cause of cancer death and can be considered a global lethal disease because incidence and mortality rates are nearly identical. Although treatment has improved, the surgery rate in patients with ductal adenocarcinoma is around 30% and the 5-year survival rate is less than 20%. In approximately 10% of all patients with pancreatic cancer, it is possible to find a family history, according to the study background.
Marco Del Chiaro, MD, PhD, of the Karolinska Institute, Stockholm, Sweden, and coauthors analyzed short-term results from an MRI-based screening program for patients with a genetic risk of developing pancreatic cancer.
The study included 40 patients (24 women and 16 men with an average age of 50 years). In 38 of the patients, increased risk of the disease was based on family history of pancreatic cancer. BRCA2, BRCA1, and p16 gene mutations were identified in some patients. The average study follow-up was 12.9 months, with MRI screening repeated after 1 year if the initial screen was negative or at 6 months if there were unspecific findings or findings that did not indicate surgery.
According to the results, MRIs found a pancreatic lesion in 16 patients (40%): intraductal papillary mucinous neoplasia, which can become invasive cancer, in 14 patients (35%) and pancreatic ductal adenocarcinoma in two patients (5%). Five patients (12.5%) required surgery (three for pancreatic ductal adenocarcinoma and two for intraductal papillary mucinous neoplasia), the remaining 35 continue under surveillance.
“An MRI-based protocol for the surveillance of [persons] at risk for developing pancreatic cancer seems to detect cancer or premalignant lesions with good accuracy,” stated the authors. “The exclusive use of MRI can reduce costs, increase availability, and guarantee the safety of the [patients] under surveillance compared with protocols that are based on more aggressive methods. However, because of the small number of patients and the divergent results, this study did not allow evaluation of the efficacy of MRI as a single screening modality.”
“Pancreatic cancer is diagnosed in only 10% of patients with syndromic risk factors or a family history of pancreatic cancer. The other 90% are considered sporadic cancers with no currently known risk factors. And that is the real challenge for the future of early detection of pancreatic cancer,” said Mark S. Talamonti, MD, of the NorthShore University HealthSystem, Evanston, Illinois, in a related commentary also in JAMA Surgery (2015; doi:10.1001/jamasurg.2015.0391).
“In current clinical practice, no biomarkers exist for diagnosing early stage disease,” said Talamonti. “Population screening with radiographic imaging or endoscopic procedures makes no clinical or economic sense for a cancer that represents only 3% of estimated new cancers each year; however, with an aging population, this most formidable of human cancers will only increase in incidence and frequency. There is a clear and unequivocal need for affordable screening strategies based on reliable biomarkers and efficient imaging modalities.”