Blood samples

Photo by Graham Colm

GLASGOW—A non-invasive prenatal test (NIPT) used to identify chromosomal fetal disorders can detect maternal cancers before symptoms appear, a new study has shown.

Testing revealed chromosomal abnormalities in 3 women that bore a resemblance to abnormalities observed in cancers. And additional testing confirmed the women had cancer—Hodgkin lymphoma (HL), follicular lymphoma (FL), and ovarian carcinoma.

This research was presented at the European Human Genetics Conference 2015 and published simultaneously in JAMA Oncology.

Nathalie Brison, PhD, of University Hospitals Leuven in Belgium, and her colleagues conducted this research with the goal of improving the NIPT test. They wanted to overcome some of the technical problems that can cause the test to produce false-negative or false-positive results.

“Even though it is very reliable, we believed that we could make it even better, and, in doing so, we could also find other chromosomal abnormalities apart from the traditional trisomy syndromes—Down’s [trisomy 21], Edward’s [trisomy 18], and Patau [trisomy 13],” Dr Brison said.

“Using the new, adapted test in over 6000 pregnancies, and looking at other chromosomes, we identified 3 different genomic abnormalities in 3 women that could not be linked to either the maternal or fetal genomic profile. We realized that the abnormalities bore a resemblance to those found in cancer and referred the women to the oncology unit.”

Further examination, including whole-body MRI scanning and pathological and genetic investigations, revealed the presence of 3 different early stage cancers in the women: ovarian carcinoma, FL, and HL.

The researchers said that, without NIPT, these cancers likely would not have been detected until the women developed symptoms.

“Considering the bad prognosis of some cancers when detected later, and given that we know that it is both possible and safe to treat the disease during pregnancy, this is an important added advantage of NIPT,” said study author Joris Vermeesch, PhD, also of University Hospitals Leuven.

“During pregnancy, cancer-related symptoms may well be masked. Fatigue, nausea, abdominal pain, and vaginal blood loss are easily interpretable as a normal part of being pregnant. NIPT offers an opportunity for the accurate screening of high-risk women for cancer, allowing us to overcome the challenge of early diagnosis in pregnant women.”

Two of the 3 women diagnosed with cancer were treated. The woman with ovarian cancer was treated after delivery.

The woman with HL was treated during pregnancy and ultimately gave birth to a healthy girl. The woman with FL has indolent disease and may not require treatment for years, according to the researchers.

Follow-up investigations in the treated women showed that NIPT had the additional advantage of allowing for treatment monitoring. The researchers were able to see that chromosomal profiles became normal during and after chemotherapy.

Because NIPT involves looking at chromosomes other than 13, 18, and 21, the women taking part in this study were informed about the possibility of incidental findings.

“However, our study feeds into the ethical debate about whether or not to report incidental findings to patients and also has implications for the current political discussions concerning reimbursement and funding of NIPT by national healthcare systems,” Dr Vermeesch said.

The results also suggest that NIPT might enable the detection of pre-symptomatic cancers in the general population.

“We now know that it is possible to offer the accurate detection of chromosomally imbalanced cancers to the general population via minimally invasive screening methods,” Dr Brison said. “The normalization of the NIPT profile in these patients following treatment indicates that we can also measure response to treatment as early as after the first administration of chemotherapy.”

“Of course, larger-scale studies will be required to validate these results further, but we are confident that we have made an important step towards the possibility of wide-scale, effective, non-invasive cancer screening capable of detecting disease at an early stage.”

Prenatal test can detect lymphoma in mothers