UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 CELSION CORPORATION (Name of Issuer) Common Stock, $0.01 Par Value (Title of Class of Securities) 15117N107 (CUSIP Number) January 21, 2003 (Date of Event Which Requires Filing of this Statement) Lawrence J. Knopf Boston Scientific Corporation One Boston Scientific Place Natick, MA 01760-1537 Telephone: (508) 650-8567 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) Copy to: Peter D. Lyons, Esq. Shearman & Sterling 599 Lexington Avenue New York, New York 10022 Telephone: (212) 848-4000 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [ ] Rule 13d-1(b) [X] Rule 13d-1(c) [ ] Rule 13d-1(d) * The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). CUSIP No. 15117N107 (1) Names of Reporting Persons I.R.S. Identification Nos. of above persons (entities only) Boston Scientific Corporation (2) Check the Appropriate Box if a Member of Group (See Instructions) [ ] (a) [ ] (b) (3) SEC Use Only (4) Citizenship or Place of Organization Delaware Number of (5) Sole Voting Power 9,375,354 Shares Beneficially (6) Shared Voting Power 0 Owned by Each (7) Sole Dispositive Power 9,375,354 Reporting Person (8) Shared Dispositive Power 0 With (9) Aggregate Amount Beneficially Owned by Each Reporting Person 9,375,354 (10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) (11) Percent of Class Represented by Amount in Row (9)* 9.2% (12) Type of Reporting Person (See Instructions) CO * This percentage is based on 101,687,922 shares of Common Stock outstanding as of January 20, 2003. Item 1. Issuer (a) Name of Issuer: Celsion Corporation (b) Address of Issuer's Principal Executive Offices: 10220-I Old Columbia Road, Columbia, MD 21046-1705 Item 2. Person Filing (a) Name of Person Filing: Boston Scientific Corporation. (b) Address of Principal Business Office: One Boston Scientific Place, Natick, MA 01760-1537. (c) Citizenship: Not applicable. (d) Title of Class of Securities: Common Stock, $0.01 par value. (e) CUSIP Number: 15117N107 Item 3. This statement is filed pursuant to 240.13d-1(c). Item 4. Ownership (a) Amount Beneficially Owned: 9,375,354 (b) Percent of class: 9.2% (c) Number of shares as to which such person has: i. Sole power to vote or to direct the vote: 9,375,354 ii. Shared power to vote or to direct the vote: 0 iii. Sole power to dispose or direct the disposition of: 9,375,354 iv. Shared power to dispose or to direct the disposition: 0 Item 5. Ownership of Five Percent or Less of a Class Not applicable. Item 6. Ownership of More than Five Percent on Behalf of Another Person Not applicable. Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company Not applicable. Item 8. Identification and Classification of Members of the Group Not applicable. Item 9. Notice of Dissolution of Group Not applicable. Item 10. Certification if Statement Filed Pursuant to Rule 13d-1(c) (a) Not applicable. (b) By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect. SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Date: January 31, 2003 BOSTON SCIENTIFIC CORPORATION By: /s/ Lawrence J. Knopf ------------------------ Name: Lawrence J. Knopf Title: Vice President and Assistant General Counsel