WALTHAM - ImmunoGen Inc. (Nasdaq: IMGN), a leader in the expanding field of antibody-drug conjugates (ADCs) for the treatment of cancer, today reviewed recent progress in the business and reported financial results for the quarter and year ended December 31, 2020.

'Despite the challenges of the pandemic, 2020 was a transformative year for ImmunoGen, as we adjusted to new ways of working, accelerated our portfolio, strengthened our management team and balance sheet, and positioned the business for two potential product launches next year,' said Mark Enyedy, ImmunoGen's President and Chief Executive Officer. 'Within our portfolio, we advanced accrual in the pivotal SORAYA and confirmatory MIRASOL trials for mirvetuximab soravtansine in patients with ovarian cancer to support our projected timelines for top-line data and regulatory submissions. In addition, we established a second registration program with our CD123-targeting ADC, IMGN632, for which we received Breakthrough Therapy designation and aligned with FDA on a path to full approval in BPDCN. Furthermore, we began dosing patients in the Phase 1 study of IMGC936, our first-in-class ADAM9-targeting ADC for solid tumors, and transitioned IMGN151, our next-generation FR-targeting ADC, into preclinical development. Finally, through a combination of business development and activity under our ATM facility, we added over $140 million to our balance sheet in the fourth quarter.'

Enyedy continued, 'With the benefit of our progress in 2020, we enter this year with significant momentum and strong prospects for the business. For mirvetuximab, these include completing enrollment in SORAYA and reporting top-line pivotal data in the third quarter, followed by a planned BLA submission by the end of the year. With IMGN632, we expect top-line pivotal data in BPDCN in 12 to 18 months and anticipate sharing data from our Phase 1b/2 study of IMGN632 in combination with azacitidine and/or venetoclax in AML patients at ASH in December. We also anticipate completing dose escalation in the clinical study of IMGC936, with initial data late this year or early 2022. Finally, we expect to submit the IND for IMGN151 by year-end. Taken together, our pivotal programs, experienced management team, and strong balance sheet position us well to execute on our strategy and transition ImmunoGen to a fully-integrated oncology company with two products on the market in 2022.'

ABOUT IMMUNOGEN

ImmunoGen is developing the next generation of antibody-drug conjugates (ADCs) to improve outcomes for cancer patients. By generating targeted therapies with enhanced anti-tumor activity and favorable tolerability profiles, we aim to disrupt the progression of cancer and offer our patients more good days. We call this our commitment to 'target a better now.'

FORWARD-LOOKING STATEMENTS

This press release includes forward-looking statements based on management's current expectations. These statements include, but are not limited to, ImmunoGen's expectations related to: the Company's revenues and operating expenses for the twelve months ending December 31, 2021; its cash and cash equivalents as of December 31, 2021; the occurrence, timing, and outcome of potential preclinical, clinical, and regulatory events related to the Company's product candidates and the presentation of preclinical and clinical data on the Company's product candidates. For these statements, ImmunoGen claims the protection of the safe harbor for forward-looking statements provided by the Private Securities Litigation Reform Act of 1995. Various factors could cause ImmunoGen's actual results to differ materially from those discussed or implied in the forward-looking statements, and you are cautioned not to place undue reliance on these forward-looking statements, which are current only as of the date of this release. Factors that could cause future results to differ materially from such expectations include, but are not limited to: the timing and outcome of the Company's preclinical and clinical development processes; the difficulties inherent in the development of novel pharmaceuticals, including uncertainties as to the timing, expense, and results of preclinical studies, clinical trials, and regulatory processes; the Company's ability to financially support its product programs; risks and uncertainties associated with the scale and duration of the COVID-19 pandemic and the resulting impact on ImmunoGen's industry and business and other factors more fully described under 'Risk Factors' set forth on Exhibit 99.1 to ImmunoGen's Current Report on Form 8-K filed with the Securities and Exchange Commission on December 18, 2020 and other reports filed with the Securities and Exchange Commission.

Contact:

Courtney O'Konek

Tel: 781-895-0600

Email: courtney.okonek@immunogen.com

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