EXHIBIT 99.1
AGREEMENT
In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that this Statement on Schedule 13D relating to the Common Stock, $0.00000002 par value, of MEI Pharma, Inc. is being filed with the Securities and Exchange Commission on behalf of each of them.
November 13, 2012
| BAKER BROS. ADVISORS, LLC | ||
| By: | /s/ Scott L. Lessing | |
| Name: Scott L. Lessing Title: President | ||
| /s/ Julian C. Baker | ||
| Julian C. Baker | ||
| /s/ Felix J. Baker | ||
| Felix J. Baker |