Exhibit 99.1

Form 4 Joint Filer Information

Name: Frazier Healthcare III, LP

Address: 601 Union Street, Suite 3200, Seattle, WA 98101

Designated Filer: FHM III, LLC

Issuer & Ticker Symbol: Trubion Pharmaceuticals, Inc. (TRBN)

Date of Event Requiring Statement: October 23, 2006

Frazier Healthcare III, LP

By: FHM III, LLC, its General Partner

By: Frazier & Company, Inc., Manager

By: /s/ Alan D. Frazier

Alan D. Frazier, President

Name: Frazier Affiliates III, LP

Address: 601 Union Street, Suite 3200, Seattle, WA 98101

Designated Filer: FHM III, LLC

Issuer & Ticker Symbol: Trubion Pharmaceuticals, Inc. (TRBN)

Date of Event Requiring Statement: October 23, 2006

Frazier Affiliates III, LP

By: FHM III, LLC, its General Partner

By: Frazier & Company, Inc., Manager

By: /s/ Alan D. Frazier

Alan D. Frazier, President

Name: FHM IV, LP

Address: 601 Union Street, Suite 3200, Seattle, WA 98101

Designated Filer: FHM III, LLC

Issuer & Ticker Symbol: Trubion Pharmaceuticals, Inc. (TRBN)

Date of Event Requiring Statement: October 23, 2006

FHM IV, LP

By: FHM IV, LLC, its General Partner

By: /s/ Alan D. Frazier

Alan D. Frazier, Member

Name: Frazier Healthcare IV, LP

Address: 601 Union Street, Suite 3200, Seattle, WA 98101

Designated Filer: FHM IV, LP

Issuer & Ticker Symbol: Trubion Pharmaceuticals, Inc. (TRBN)

Date of Event Requiring Statement: October 23, 2006

Frazier Healthcare IV, LP

By: FHM IV, LP, its General Partner

By: FHM IV, LLC, its General Partner

By: /s/ Alan D. Frazier

Alan D. Frazier, Member

Name: Frazier Affiliates IV, LP

Address: 601 Union Street, Suite 3200, Seattle, WA 98101

Designated Filer: FHM IV, LP

Issuer & Ticker Symbol: Trubion Pharmaceuticals, Inc. (TRBN)

Date of Event Requiring Statement: October 23, 2006

Frazier Affiliates IV, LP

By: FHM IV, LP, its General Partner

By: FHM IV, LLC, its General Partner

By: /s/ Alan D. Frazier

Alan D. Frazier, Member