Washington, D.C. 20549

DUSA PHARMACEUTICALS, INC.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

266898105

(CUSIP Number)

July 28, 2010

(Date of Event Which Requires Filing of this Statement)

* 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 the 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.		266898105

CUSIP No.		266898105

CUSIP No.		266898105

CUSIP No.		266898105

CUSIP No.		266898105

CUSIP No.		266898105

This statement reflects changes to the information in the Schedule 13D relating to the Common Stock of the issuer filed December 9, 2008 by the Reporting Persons with the Commission, as amended by Amendment No. 1 thereto filed February 26, 2010, Amendment No. 2 thereto filed April 8, 2010, and Amendment No. 3 thereto filed May 13, 2010 (as amended, the “Schedule 13D”). Each capitalized term used and not defined in this statement shall have the meaning assigned to such term in the Schedule 13D.

Item 1.

(a)

Name of Issuer

DUSA PHARMACEUTICALS, INC.

(b)

Address of Issuer’s Principal Executive Offices

25 Upton Drive, Wilmington, MA 01887

Item 2.

(a)

Name of Person Filing

This statement is jointly filed by and on behalf of each of SRB Management, L.P. (“SRB Management”), SRB Greenway Opportunity Fund (QP), L.P. (“Greenway Opportunity QP”), SRB Greenway Opportunity Fund, L.P. (“Greenway Opportunity L.P.”), BC Advisors, LLC (“BCA”), Steven R. Becker (“Mr. Becker”) and Matthew A. Drapkin (“Mr. Drapkin,” and together with SRB Management, Greenway Opportunity QP, Greenway Opportunity L.P., BCA and Mr. Becker, the “Reporting Persons”). Greenway Opportunity QP and Greenway Opportunity L.P. are collectively referred to herein as the “Greenway Funds.”

Greenway Opportunity QP has the power to vote or to direct the vote of (and the power to dispose or direct the disposition of) the shares owned by it (the “Greenway Opportunity QP Shares”). Greenway Opportunity QP disclaims beneficial ownership of the Greenway Opportunity L.P. Shares.

Greenway Opportunity L.P. has the power to vote or to direct the vote of (and the power to dispose or direct the disposition of) the shares owned by it (the “Greenway Opportunity L.P. Shares,” and together with the Greenway Opportunity QP Shares, the “Greenway Funds Shares”). Greenway Opportunity L.P. disclaims beneficial ownership of the Greenway Opportunity QP Shares.

As general partner of each of the Greenway Funds, SRB Management may be deemed to have the shared power to vote or direct the vote of (and the shared power to dispose or direct the disposition of) the Greenway Funds Shares. SRB Management does not own any shares of Common Stock directly and disclaims beneficial ownership of the Greenway Funds Shares.

As general partner of SRB Management, BCA may be deemed to have the shared power to vote or direct the vote of (and the shared power to dispose or direct the disposition of) any shares of Common Stock beneficially owned by SRB Management. BCA does not own any shares of Common Stock directly and disclaims beneficial ownership of any shares of Common Stock beneficially owned by SRB Management.

As co-managing members of BCA, each of Mr. Becker and Mr. Drapkin may be deemed to have the shared power to vote or direct the vote of (and the shared power to dispose or direct the disposition of) any shares of Common Stock beneficially owned by BCA. Mr. Becker and Mr. Drapkin each disclaim beneficial ownership of any shares of Common Stock beneficially owned by BCA.

Each Reporting Person declares that neither the filing of this statement nor anything herein shall be construed as an admission that such person is, for the purposes of Sections 13(d) or 13(g) of the Act, the beneficial owner of any securities covered by this statement.

(b)

Address of Principal Business Office or, if none, Residence

The address of the principal business office of each of the Reporting Persons is 300 Crescent Court, Suite 1111, Dallas, Texas 75201.

(c)

Citizenship

See Item 4 on the cover page(s) hereto.

(d)

Title of Class of Securities

Common Stock

(e)

CUSIP Number

266898105

Item 3.		If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is:

	(a)	o	A Broker or dealer registered under Section 15 of the Act (15 U.S.C. 78o).
	(b)	o	A Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c).
	(c)	o	An insurance company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c).
	(d)	o	An investment company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).
	(e)	o	An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);
	(f)	o	An employee benefit plan or endowment fund in accordance with §240.13d- 1(b)(1)(ii)(F);
	(g)	o	A parent holding company or control person in accordance with §240.13d- 1(b)(1)(ii)(G);
	(h)	o	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
	(i)	o	A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
	(j)	o	A non-U.S. institution in accordance with §240.13d-1(b)(1)(ii)(J);
	(k)	o	A group, in accordance with §240.13d-1(b)(1)(ii)(K).

If filing as a non-U.S. institution in accordance with §240.13d-1(b)(1)(ii)(J), please specify the type of institution:                    

Item 4.		Ownership.

(a)

Amount beneficially owned: See Item 9 on the cover page(s) hereto.

	(b)		Percent of class: See Item 11 on the cover page(s) hereto.
	(c)		Number of shares as to which such person has:

	(i)		Sole power to vote or to direct the vote: See Item 5 on the cover page(s) hereto.
	(ii)		Shared power to vote or to direct the vote: See Item 6 on the cover page(s) hereto.
	(iii)		Sole power to dispose or to direct the disposition of: See Item 7 on the cover page(s) hereto.
	(iv)		Shared power to dispose or to direct the disposition of: See Item 8 on the cover page(s) hereto.

Item 5.		Ownership of Five Percent or Less of a Class.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following o.

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 or Control Person.

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.		Certifications

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.

EXHIBIT INDEX

Exhibit		Description of Exhibit
99.1		Joint Filing Agreement (furnished herewith).