Seagen (SGEN) 10-Q 2002 Q2 Quarterly report

Exhibit 99.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the accompanying Quarterly Report on Form 10-Q of Seattle Genetics, Inc. (the “Company”) for the period ended June 30, 2002 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, H. Perry Fell, Chief Executive Officer of the Company, hereby certify pursuant to 18 U.S.C. 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1)           the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)           the information contained in the Report fairly presents in all material respects the financial condition and results of operations of the Company.

August 13, 2002	/s/ H. Perry Fell
Date	H. Perry Fell
	Chief Executive Officer

In connection with the accompanying Quarterly Report on Form 10-Q of Seattle Genetics, Inc. (the “Company”) for the period ended June 30, 2002 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Tim Carroll, Chief Financial Officer of the Company, hereby certify pursuant to 18 U.S.C. 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1)           the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)           the information contained in the Report fairly presents in all material respects the financial condition and results of operations of the Company.

August 13, 2002	/s/ Tim Carroll
Date	Tim Carroll
	Chief Financial Officer