Syndax Pharmaceuticals, Inc., a clinical-stage biopharmaceutical company, develops therapies for the treatment of cancer. Its lead product candidates are revumenib, a potent, selective, small molecule inhibitor of the menin-MLL binding interaction for the treatment of KMT2A rearranged, acute leukemias, and solid tumor; and SNDX-6352 or axatilimab, a monoclonal antibody that blocks the colony stimulating factor 1, or CSF-1 receptor for the treatment of patients with chronic graft versus host disease (cGVHD) and idiopathic pulmonary fibrosis (IPF). The company is also developing Entinostat. It has an agreement with Eddingpharm International Company Limited for licensing, development, and commercialization of Entinostat. Syndax Pharmaceuticals, Inc. was incorporated in 2005 and is headquartered in Waltham, Massachusetts.

Replimune Group, Inc., a clinical-stage biotechnology company, focuses on the development of oncolytic immunotherapies to treat cancer. The company's proprietary tumor-directed oncolytic immunotherapy product candidates are designed and intended to activate the immune system against cancer. Its lead product candidate is RP1, a selectively replicating version of HSV-1 that expresses GALV-GP R(-) and human GM-CSF, which is in Phase I/II clinical trials for a range of solid tumors. The company is also developing RP2, which is in Phase I clinical trials to express an anti-CTLA-4 antibody-like protein to block the inhibition of the immune response otherwise caused by CTLA-4; and RP3 that is in Phase I clinical trial to express immune-activating proteins that stimulate T cells. Replimune Group, Inc. was founded in 2015 and is headquartered in Woburn, Massachusetts.

Iteos Therapeutics, Inc., a clinical-stage biopharmaceutical company, engages in the discovery and development of immuno-oncology therapeutics for patients with cancer. The company's lead antibody product candidate, belrestotug, an antagonist of TIGIT or T-cell immunoreceptor with Ig and ITIM domains, which is in Phase 1b clinical trial, as well as used to engage the Fc gamma receptor, or Fc?R to activate dendritic cells, natural killer cells, and macrophages and to promote antibody-dependent cellular cytotoxicity, or ADCC activity. Its product pipeline also includes inupadenant, a next-generation A2AR antagonists that is in Phase 1/2a clinical trials to overcome the specific adenosine-mediated immunosuppression found in tumor microenvironment; and EOS-984, a small molecule targeting equilibrative nucleoside transporter 1 (ENT1) to inhibit the immunosuppressive activity of adenosine and restore immune cell proliferation is in Phase 1 clinical trials. Iteos Therapeutics, Inc. was founded in 2011 and is headquartered in Watertown, Massachusetts.

Checkpoint Therapeutics, Inc., a clinical-stage immunotherapy and targeted oncology company, focuses on the acquisition, development, and commercialization of novel treatments for patients with solid tumor cancers in the United States and internationally. The company's lead antibody product candidate is Cosibelimab, which is in Phase 1 clinical trial to treat patients with selected recurrent or metastatic cancers; and CK-302, a product candidate in preclinical trials for hematological malignancies and solid tumors. It is developing Olafertinib, which is in Phase 3 clinical trials for the treatment of adult patients with metastatic non-small cell lung cancer; CK-103 for the treatment of various advanced and metastatic solid tumor cancers; and Anti-Carbonic Anhydrase IX (CAIX) antibody, a product candidate in preclinical trials to recognize CAIX expressing cells and kill them via antibody-dependent cellular cytotoxicity and complement-dependent cytotoxicity. The company has licensing and collaboration agreements with Adimab, LLC for the development of Cosibelimab; NeuPharma, Inc., to develop and commercialize Olafertinib; and Jubilant Biosys Limited for the development and commercialization of novel compounds that inhibit BET bromodomains, as well as collaboration with GC Cell. The company was incorporated in 2014 and is based in Waltham, Massachusetts. Checkpoint Therapeutics, Inc. is a subsidiary of Fortress Biotech, Inc.

C4 Therapeutics, Inc., a clinical-stage biopharmaceutical company, develops novel therapeutic candidates to degrade disease-causing proteins for the treatment of cancer, neurodegenerative conditions, and other diseases. Its lead product candidate is CFT7455, an orally bioavailable MonoDAC degrader of protein that is in Phase 1/2 trial targeting IKZF1 and IKZF3 for multiple myeloma and non-Hodgkin lymphomas, including peripheral T-cell lymphoma and mantle cell lymphoma, currently under Phase 1/2 clinical trials. The company is also developing CFT1946, an orally bioavailable BiDAC degrader targeting V600X mutant BRAF to treat melanoma, non-small cell lung cancer (NSCLC), colorectal cancer, and other solid malignancies, currently under Phase 1/2 clinical trials; and CFT8919, an orally bioavailable, allosteric, and mutant-selective BiDAC degrader of epidermal growth factor receptor, or EGFR, with an L858R mutation in NSCLC. It has strategic collaborations with F. Hoffmann-La Roche Ltd and Hoffmann-La Roche Inc.; Biogen MA, Inc.; Betta Pharmaceuticals, Co., Ltd.; and Merck Sharp & Dohme, LLC, as well as Calico Life Sciences LLC. The company was incorporated in 2015 and is headquartered in Watertown, Massachusetts.

TScan Therapeutics, Inc., a clinical-stage biopharmaceutical company, develops T cell receptor-engineered T cell (TCR-T) therapies for the treatment of patients with cancer in the United States. The company's lead product candidates include TSC-100 and TSC-101 that is in Phase I clinical trial for the treatment of patients with hematologic malignancies to eliminate residual disease and prevent relapse after allogeneic hematopoietic cell transplantation. It also develops TSC-200, TSC-201, TSC-203, and TSC-204, which are in Phase 1 clinical trial, for the treatment of solid tumors; and TSC-202 to treat solid tumors. In addition, the company develops vaccines for infectious diseases, such as SARS-CoV-2. It has collaborations with Novartis Institutes for BioMedical Research, Inc. To discover and develop novel TCR-T therapies; and Amgen Inc. to identify antigens recognized by T cells in patients with Crohn's disease using TargetScan, a proprietary target discovery platform. TScan Therapeutics, Inc. was incorporated in 2018 and is headquartered in Waltham, Massachusetts.

Elicio Therapeutics, Inc., a clinical-stage biotechnology company, develops a pipeline of novel immunotherapies for the treatment of cancer. Its lead product candidate is ELI-002, a multivalent lymph node–targeted AMP peptide vaccine that is in Phase II clinical trial to target seven Kirsten rat sarcoma viral oncogene homolog driver mutations. The company is also developing ELI-007, a multivalent lymph node–targeted AMP peptide vaccine to target mutant v-raf murine sarcoma viral oncogene homolog B1 gene mutations found in solid tumors; and ELI-008, a multivalent lymph node–targeted AMP peptide vaccine to target p53 hotspot mutations. The company is headquartered in Boston, Massachusetts.

Xilio Therapeutics, Inc., a clinical-stage biotechnology company, engages in the discovery and development of tumor-activated immuno-oncology therapies. The company's checkpoint inhibitor program includes XTX101, an investigational Fc-enhanced, tumor-activated anti-CTLA-4 mAb that is in Phase 2 clinical trial for patients with advanced solid tumors. It also develops cytokine programs, which comprises XTX202, a tumor-activated beta-gamma biased IL-2, currently under Phase 2 clinal trials; and XTX301, an investigational tumor-activated, engineered IL-12 molecule, currently under Phase 1 studies. The company was founded in 2016 and is headquartered in Waltham, Massachusetts.