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Investigating the biodistribution of cell and gene therapy products may play an important role in evaluating their safety and pharmacology. As quantitative polymerase chain reaction (qPCR) is often used for these analyses, it is essential to improve the reliability of bioanalysis performed using qPCR. In this report, the authors discuss the use of qPCR in nonclinical studies, as it can be used to detect target DNA/RNA and it is quantitative and applicable for long-term analysis. The authors also discuss points to consider during bioanalysis using qPCR and present appropriate validation items and their criteria. The authors anticipate the discussion provided herein to contribute to the development of validation and sample analysis for pharmaceuticals analyzed using qPCR.