A case of CD74-ROS1-positive lung adenocarcinoma diagnosed by next-generation sequencing achieved long-term survival with pemetrexed regimens.

Previously, cytotoxic drugs were the only option for patients with non-small cell lung cancer (NSCLC) and the prognosis was poor. However, molecularly targeted therapies and immune checkpoint inhibitors represent a breakthrough in the treatment of advanced NSCLC and have improved survival rates. In addition, advances in next-generation sequencing (NGS) have revealed the landscape of genomic alterations in patients with different cancers, aiding in the development of new molecularly targeted drugs. The patient reported here was a 54-year-old woman with left lower lung adenocarcinoma. The lung cancer was staged as T2aN3M1a stageIVA 11 years ago. She had received seven regimens of chemotherapy for 11 years. Among these, pemetrexed (PEM) regimens particularly showed long-term effects totaling more than 5 years. We performed NGS after disease progression of the seventh treatment. NGS revealed CD74-ROS1 fusion and she was treated with entrectinib. She has been taking entrectinib for over 20 months now. Herein, we report a rare case of CD74-ROS1-positive lung adenocarcinoma diagnosed by NGS that achieved long-term survival with cytotoxic drugs, especially PEM regimens. In patients showing favorable clinical response to PEM regimens, physicians should consider testing for ROS1/ALK rearrangement.

[Examination of HCV infection in hemodialysis patients with HCV-RNA assay using a magnetic extraction method (AmpliCap GT HCV MONITOR Test Kit v2.0 and AmpliCap GT HCV Specimen Preparation Kit v2.0)].

Hemodialysis(HD) patients are a high-risk group for hepatitis C virus(HCV) infection. Detection of HCV-RNA is important for safety and environmental protection in HD units. PCR-based methods are unsuitable for analyzing large samples of HD patients, because conventional centrifugal extraction method fails to eliminate heparin, a potent inhibitor of PCR. We have reported the usefulness of a new HCV-RNA extraction method using specific capture probes and magnetic particles in comparison with conventional centrifugal extraction method in hemodialysis patients. In this study, we evaluated the rate of HCV infection and HCV-RNA positivity by using a magnetic extraction method. As a result, the rate of HCV infection in dialysis patients was significantly higher than that of healthy people, and positivity for HCV infection was found to be related to the duration of hemodialysis. It has been assumed that the rate of new HCV infection is decreased as the result of improvement in dialysis equipment, a decrease in the need for blood transfusion due to the availability of erythropoietin for renal anemia, and the introduction of anti-HCV screening for blood donors. Hospital infection was strongly suggested from the evidence that the correlation with the rate of HCV infection and duration of dialysis was not significantly changed. HCV-RNA positivity was observed in two among 435 HCV antibody-negative patients. Since HCV-RNA positivity has been observed in HCV antibody-negative patients in HD units, combination with HCV-RNA by the magnetic extraction method and anti-HCV antibodies should be useful for the treatment of HCV infection. In this study, the effectiveness of IFN therapy was expected in 56.7%(38/67) that were genotype2 and/or had a low viral load. A precise diagnosis using HCV-RNA assay by the magnetic extraction method and precise medication including IFN therapy is desired for improving the long-term prognosis of dialysis patients.