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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 SsKlxVJntDCSXKNH4a4srGKWu626bkRx+EGfaHkhearT1il5yiXLgXvQuxkV/TYB
 mB7d9Dn+ijnl5/VAOORxlw==

<SEC-DOCUMENT>0001209191-04-056259.txt : 20041207
<SEC-HEADER>0001209191-04-056259.hdr.sgml : 20041207
<ACCEPTANCE-DATETIME>20041207160757
ACCESSION NUMBER:		0001209191-04-056259
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20041203
FILED AS OF DATE:		20041207
DATE AS OF CHANGE:		20041207

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ILEX ONCOLOGY INC
		CENTRAL INDEX KEY:			0001001915
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				943123681
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		4545 HORIZON HILL BLVD
		CITY:			SAN ANTONIO
		STATE:			TX
		ZIP:			78229
		BUSINESS PHONE:		210-949-8200

	MAIL ADDRESS:	
		STREET 1:		4545 HORIZON HILL BLVD
		CITY:			SAN ANTONIO
		STATE:			TX
		ZIP:			78229

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			FISHERMAN JASON S
		CENTRAL INDEX KEY:			0001197540

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-22147
		FILM NUMBER:		041188628

	MAIL ADDRESS:	
		STREET 1:		C/O ADVENT INTERNATIONAL CORP
		STREET 2:		75 STATE ST 29TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02104
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-12-03</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001001915</issuerCik>
        <issuerName>ILEX ONCOLOGY INC</issuerName>
        <issuerTradingSymbol>ILXO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001197540</rptOwnerCik>
            <rptOwnerName>FISHERMAN JASON S</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ADVENT INTERNATIONAL</rptOwnerStreet1>
            <rptOwnerStreet2>75 STATE STREET, 29TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02109</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>common stock</value>
            </securityTitle>
            <transactionDate>
                <value>2004-12-03</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2004-12-03</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>4000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>25.25</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>16844</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Janet L. Hennessy, Attorney-in-Fact</signatureName>
        <signatureDate>2004-12-07</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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