WALTHAM, Mass., Mar 30, 2015 (BUSINESS WIRE) — ImmunoGen, Inc. IMGN, +4.12% a biotechnology company that develops targeted anticancer therapeutics using its antibody-drug conjugate (ADC) technology, today announced a $200 million non-dilutive royalty transaction with funds managed by TPG Special Situations Partners (“TSSP”).

In return for the payment to ImmunoGen, TSSP will have the right to receive 100% of the royalty revenue on Kadcyla® commercial sales that would otherwise be paid by Roche to ImmunoGen until TSSP has received a total of either $235 million or $260 million, depending on timing. After this threshold is met, if ever, ImmunoGen will receive 85% of the Kadcyla royalty revenue and TSSP will receive 15% of the Kadcyla royalty revenue until this revenue stream ends. The transaction is subject to the satisfaction of customary closing conditions and is expected to close in early April 2015.

ImmunoGen had approximately $107 million in cash and cash equivalents as of December 31, 2014. The transaction announced today is expected to yield net proceeds to ImmunoGen of approximately $194 million.

“With these funds, we are well positioned to implement strong clinical development programs for our promising product candidates, including initiation of potential registration trials as appropriate,” commented David Johnston, EVP and Chief Financial Officer. “This transaction has met our objectives of obtaining significant cash while avoiding the dilutive effect of a stock offering and retaining for our shareholders the majority of upside from substantial Kadcyla sales development.”

ImmunoGen will provide updated guidance for its 2015 fiscal year on April 24, 2015, when the Company reports its quarterly financial results.

MTS Health Partners, L.P. served as financial advisor and Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C. served as legal advisor to ImmunoGen. Cooley LLP served as legal advisor to TSSP.

About Kadcyla Royalties

Genentech, a member of the Roche Group, developed Kadcyla (ado-trastuzumab emtansine) using ADC technology licensed from ImmunoGen under a 2000 agreement established between the companies. This agreement entitles ImmunoGen to receive royalties ranging from 3-5% on Kadcyla sales in countries where ImmunoGen holds valid patents covering Kadcyla, and 2% in countries without relevant ImmunoGen patents. ImmunoGen is entitled to receive royalties on commercial Kadcyla sales in each country for ten years after the launch of Kadcyla in that country. This period extends to twelve years for each country in which ImmunoGen has valid claims in relevant patents on the tenth anniversary of the commercial launch of Kadcyla in that country.

About TPG Special Situations Partners

TSSP, with over $11 billion of assets under management as of December 31, 2014, is the dedicated credit platform of TPG, a leading global private investment firm founded in 1992. TSSP has extensive experience with highly complex, global public and private investments executed through primary originations, secondary market purchases and restructurings. TSSP has since inception invested in the healthcare space including working with companies and academic institutions on royalty monetization transactions, debt financings, late stage clinical trial fundings, and other healthcare related financings.

About ImmunoGen, Inc.

ImmunoGen, Inc. develops targeted anticancer therapeutics. The Company’s ADC technology uses tumor-targeting antibodies to deliver an ImmunoGen cell-killing agent specifically to cancer cells. The Company utilizes its ADC technology with its antibodies to create ImmunoGen product candidates and also out-licenses limited rights to use its technology to other companies. Roche’s Kadcyla is the first marketed product with ImmunoGen’s ADC technology. More information about the Company can be found at www.immunogen.com.