<SEC-DOCUMENT>0001209191-17-051978.txt : 20170907
<SEC-HEADER>0001209191-17-051978.hdr.sgml : 20170907
<ACCEPTANCE-DATETIME>20170907201710
ACCESSION NUMBER:		0001209191-17-051978
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20170905
FILED AS OF DATE:		20170907
DATE AS OF CHANGE:		20170907

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Eliseev Alexey
		CENTRAL INDEX KEY:			0001694380

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-36304
		FILM NUMBER:		171074945

	MAIL ADDRESS:	
		STREET 1:		257 SIMARANO DRIVE, SUITE 101
		CITY:			MARLBOROUGH
		STATE:			MA
		ZIP:			01752

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			RXi Pharmaceuticals Corp
		CENTRAL INDEX KEY:			0001533040
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		257 SIMARANO DRIVE
		STREET 2:		SUITE 101
		CITY:			MARLBOROUGH
		STATE:			MA
		ZIP:			01752
		BUSINESS PHONE:		(508) 767-3861

	MAIL ADDRESS:	
		STREET 1:		257 SIMARANO DRIVE
		STREET 2:		SUITE 101
		CITY:			MARLBOROUGH
		STATE:			MA
		ZIP:			01752
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-09-05</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001533040</issuerCik>
        <issuerName>RXi Pharmaceuticals Corp</issuerName>
        <issuerTradingSymbol>RXII</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001694380</rptOwnerCik>
            <rptOwnerName>Eliseev Alexey</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O 257 SIMARANO DRIVE, SUITE 101</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MARLBOROUGH</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01752</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Business Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common stock, par value $0.0001</value>
            </securityTitle>
            <transactionDate>
                <value>2017-09-05</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>26181</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.5571</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1100931</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common stock, par value $0.0001</value>
            </securityTitle>
            <transactionDate>
                <value>2017-09-06</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>91907</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.5365</value>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1009024</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common stock, par value $0.0001</value>
            </securityTitle>
            <transactionDate>
                <value>2017-09-07</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>58712</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.5283</value>
                    <footnoteId id="F4"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>950312</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The sales reported were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.</footnote>
        <footnote id="F2">Represents the weighted average sale price. The lowest price at which shares were sold was $0.55 and the highest price at which shares were
sold was $0.58.The reporting person hereby undertakes to provide upon request to the SEC staff or other appropriate persons full information
regarding the number of shares and prices at which the transaction was effected.</footnote>
        <footnote id="F3">Represents the weighted average sale price. The lowest price at which shares were sold was $0.525 and the highest price at which shares were
sold was $0.561.The reporting person hereby undertakes to provide upon request to the SEC staff or other appropriate persons full information
regarding the number of shares and prices at which the transaction was effected.</footnote>
        <footnote id="F4">Represents the weighted average sale price. The lowest price at which shares were sold was $0.52 and the highest price at which shares were sold was $0.545.The reporting person hereby undertakes to provide upon request to the SEC staff or other appropriate persons full information regarding the number of shares and prices at which the transaction was effected.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Caitlin Kontulis, attorney-in-fact</signatureName>
        <signatureDate>2017-09-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
