Dr. Reckamp suggested that “most patients with adenocarcinoma” should be tested for RET rearrangements. “Both men and women, both smokers and nonsmokers. And if you don’t test, you won’t find it. And if you don’t find it, you won’t be able to treat.” Dr. Reckamp also noted that next generation sequencing (NGS) should be the preferred method of identifying RET status because NGS uses less tissue, provides genetic sequencing, and allows for the identification of binding partners.
“Does targeting RET improve patient outcomes?” she continued. “Because that is really the question we need to answer if we need to move forward with RET inhibition for lung cancer. So there are variable response rates, less than other inhibitors of other oncogenic-driven tumors, that’s for sure... But if you look at the data, and these are [for] heavily pretreated patients for the most part, the response rates are better than second-line cytotoxic chemotherapy that we have had in the past and similar to unselected checkpoint inhibition. So there is potential for improving outcomes, and again if we don’t know someone is RET, we potentially are not going to offer a treatment that could help them live longer or better.”
When asked how she would treat a newly-diagnosed patient with RET-positive NSCLC, Dr. Reckamp said she would treat with first-line chemotherapy rather than a tyrosine kinase inhibitor (TKI) but would enroll the patient in whatever TKI trial was ongoing at that point in time.
“There are multiple trials that are ongoing,” Dr. Reckamp said. “It is unlikely that a comparison trial will be completed and so we are going to have to look at these trials next to each other and differentiate based on toxicity [and] perceived efficacy.”
Specifically, Dr. Reckamp believes the medical community needs to move toward “universal testing” for RET status in lung cancer patients. Resistance and combination therapies will also need to be assessed in future studies.
“RET is important in lung cancer, and should be targeted. We now need to find the best way to do that,” Dr. Reckamp concluded.
The trial headed by Dr. Seto was funded by the Japan Agency for Medical Research and Development, AMED, and AstraZeneca. Dr. Seto reported receiving honoraria and research funding from multiple companies including AstraZeneca. The trial headed by Dr. Lee was funded by AstraZeneca Korea. Dr. Lee reported having a consulting or advisory role and receiving honoraria and research funding from AstraZeneca, Pfizer, and Roche/Genentech.