Funding for this research was provided by:
Japan Society for the Promotion of Science (16K09598, 17K10617, 18K15937)
First Online: 28 May 2020
Compliance with ethical standards
: The authors declare that there is no conflict of interests in this research. We obtained a grant from Nichias Corporation. It is not a pharmaceutical company but a company making industrial products for building, automobiles and pipes (see ExternalRef removed). The grant is as a kind of their mécénat activities, corporate social contributions, which is aimed to assist for medical research for intractable cancer treatments. We are thereby irrelevant to any employment, consultancy, patents or products in development or marketed products to the company. All the authors agree to publish the data included in the manuscript.