EXHIBIT 31.2



CERTIFICATION OF PRINCIPAL FINANCIAL
OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY
ACT OF 2002



I, Kevin R. Harris, certify that:



1. I have reviewed this Annual Report on Form 10-K for the
fiscal year ended December 31, 2012 as amended by Amendment No. 1 thereto on Form 10-K/A of Response Genetics, Inc.;



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;



3. Based on my
knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects
the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this
report;



4. The registrant’s
other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined
in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules
13a-15(f) and 15d-15(f)) for the registrant and have:



(a)
Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision,
to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in which this report is being prepared;



(b)
Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed
under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of
financial statements for external purposes in accordance with generally accepted accounting principles;



(c)
Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions
about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on
such evaluation; and



(d)
Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the
registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that
has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial
reporting; and



5. The registrant’s
other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting,
to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing
the equivalent functions):



(a)
All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which
are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information;
and



(b)
Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s
internal control over financial reporting.



|Date: April 29, 2013 | /s/
    Kevin R. Harris        
|-------------------- | -------------------------------
|                     | Kevin R. Harris                
|                     | Interim Chief Financial Officer
|                     | (Principal Financial Officer)