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Articles by K Okamoto
Total Records ( 2 ) for K Okamoto
  M Izumiya , K Okamoto , N Tsuchiya and H. Nakagama

MicroRNA (miRNA) is a class of non-coding RNAs that represses expression of target messenger RNAs posttranscriptionally. A growing body of evidence supports their roles in various normal cellular processes, as well as in pathological conditions, such as cancer. We established a functional screening assay that enables high-throughput identification of miRNAs that have a role in cancer phenotypes of interest, via the combination of pooled lentivirus vectors expressing several hundred miRNA precursors and a custom-made microarray. Self versus self-hybridization analysis using pooled polymerase chain reaction products generated highly linear and reproducible results. To test the feasibility of the assay, we focused on miRNAs that control proliferation of pancreatic cancer cells and successfully identified five miRNAs that negatively control cell proliferation, including miRNA-34a that was previously identified as a representative tumor-suppressive miRNA. The results were further validated using lentivirus vectors expressing each of the five miRNAs or synthetic miRNAs. The function-based nature of the assay enabled identification of miRNAs that were strongly linked to cell proliferation, but the relative ease and flexibility of the assay allow for future studies of cancer stem cells, metastasis and other cancer phenotypes of interest.

  K Okamoto , I Okamoto , K Takezawa , I Tachibana , M Fukuoka , Y Nishimura and K. Nakagawa

The optimal management of elderly patients with limited-disease small cell lung cancer (LD-SCLC) has not been established.


The records of elderly (≥70 years of age) patients with LD-SCLC who had been treated with etoposide and cisplatin chemotherapy with early concurrent twice-daily thoracic radiotherapy (TRT) were reviewed retrospectively.


Of the 25 elderly patients with LD-SCLC identified, 12 (48%) individuals received etoposide–cisplatin chemotherapy with early concurrent twice-daily TRT. The main toxicities of this treatment regimen were hematologic, with neutropenia of Grade 4 being observed in all patients and febrile neutropenia of Grade 3 in eight patients during the first cycle of chemoradiotherapy. The toxicity of TRT was acceptable, with all patients completing the planned radiotherapy within a median of 29 days (range, 19–33). No treatment-related deaths were observed. The median progression-free survival and overall survival times were 14.2 months (95% confidence interval, 4.3–18.2) and 24.1 months (95% confidence interval, 11.3–27.2), respectively.


Etoposide–cisplatin chemotherapy with early concurrent twice-daily TRT was highly myelotoxic in elderly patients with LD-SCLC, although no treatment-related deaths were observed in our cohort. Prospective studies are required to establish the optimal schedule and dose of chemotherapy and TRT in such patients.

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