Exhibit 31.4
CERTIFICATION
I, Jamie A. Donadio, certify that:
1. I have reviewed this Amendment No. 1 to the Quarterly Report on Form 10-Q/A of Mirati Therapeutics, Inc.; and
2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.
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| Date: August 20, 2018 | | /s/ Jamie A. Donadio |
| | | Jamie A. Donadio |
| | | Senior Vice President and Chief Financial Officer |
| | | (Principal Financial Officer) |
