**Exhibit 10.18**

**WARRANT TERMINATION AGREEMENT**

**THIS WARRANTTERMINATION AGREEMENT** (this “Agreement”) is made as of November 17, 2010, by and between LAURUS MASTER FUND, LTD. (IN LIQUIDATION), a Cayman Islands company (“Laurus”), and BIOVEST INTERNATIONAL, INC., aDelaware corporation (“Biovest”). 

**RECITALS**

**WHEREAS**, on March 31, 2006, Biovest and Laurus entered into a Note and Warrant Purchase Agreement (the“Biovest Purchase Agreement”), pursuant to which Laurus purchased a Secured Promissory Note in the original principal amount of $7,799,000 from Biovest; 

**WHEREAS**, in connection with the Biovest Purchase Agreement, Biovest executed and issued to Laurus a Common StockPurchase Warrant (the “Laurus Warrant”) for the purchase by Laurus, on or before March 31, 2021, of up to 18,087,889 shares of the Biovest Common Stock at an exercise price of $0.01 per share; 

**WHEREAS**, pursuant to that certain Term Loan and Security Agreement (the “Security Agreement”)dated as of November 17, 2010, by and among Biovest, the Lenders party thereto and LV Administrative Services, Inc., the parties hereto, in consideration for the acceptance by certain of the Prepetition Lenders of the allowed secured claimsagainst Biovest as provided therein, have agreed, among other things, to the termination and cancellation of the Laurus Warrant; and 

**WHEREAS**, pursuant to the terms and conditions of the Security Agreement and the Confirmed Plan, Laurus and Biovest desire to terminate and cancel the Laurus Warrant effective as of the date of thisAgreement. 

**NOW, THEREFORE**, for good and valuable consideration, the receipt and sufficiency of whichare hereby acknowledged, the parties hereto hereby agree as follows: 

1.          Capitalized terms used but not defined herein shall havethe meanings ascribed to them in the Security Agreement. 

2.          The parties hereto agree that the above Recitals are trueand correct in all respects. 

3.          Laurus herebyconsents to the termination and cancellation of the Laurus Warrant (and all of the rights and obligations created thereunder), and Biovest hereby cancels the Laurus Warrant, effective as of the date of this Agreement. 

4.          Laurus hereby acknowledges and agrees that it shall have noclaims of any nature whatsoever against Biovest as a result of the termination and cancellation of the Laurus Warrant. 

5.          This Agreement shall be binding upon the parties hereto and their respective successors and assigns. The parties hereto agree that thisAgreement is fully and adequately supported by consideration, is fair and reasonable, and that they have had the opportunity to discuss this matter with counsel of their choice. This Agreement may be executed in one or

 
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more counterparts, each of which shall be deemed an original and all of which together shall be deemed to constitute one agreement. It is understood and agreed that if facsimile copies of thisAgreement bearing facsimile signatures are exchanged between the parties hereto, such copies shall in all respects have the same weight, force and legal effect and shall be fully as valid, binding, and enforceable as if such signed facsimile copieswere original documents bearing original signature. 

6.        THISAGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED, INTERPRETED AND ENFORCED ACCORDING TO, THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO PRINCIPLES OF CONFLICT OF LAWS PROVISIONS THEREOF. ANY ACTION BROUGHT CONCERNING THE TRANSACTIONSCONTEMPLATED BY THIS AGREEMENT SHALL BE BROUGHT ONLY IN THE STATE COURTS OF NEW YORK OR IN THE FEDERAL COURTS LOCATED IN THE STATE OF NEW YORK. The prevailing party shall be entitled to recover from the other party its reasonableattorneys’ fees and costs. Wherever possible each provision of this Agreement shall be interpreted in such manner as to be effective and valid under applicable law, but if any provision of this Agreement shall be prohibited by or invalid undersuch law, such provision shall be ineffective to the extent of such prohibition or invalidity, without invalidating the remainder of such provision or the remaining provisions of this Agreement. 

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**IN WITNESS WHEREOF**, the undersigned have executed this Agreement asof the date first above written. 

 
LAURUS MASTER FUND, LTD. (IN