H.C. Wainwright analyst Debjit Chattopadhyay said he had "misplaced optimism" about the path forward for ImmunoGen's mirvetuximab and admits to having been "wrong again" about the stock after the company disclosed that the FDA has recommended a new Phase 3 randomized trial to evaluate the safety and efficacy of mirvetuximab soravtansine in patients with high folate receptor alpha-positive, platinum-resistant ovarian cancer. The analyst believes the subsequent study, likely to be initiated during Q4, will likely mimic the FORWARD I Phase 3 program, but focus primarily on high FRalpha expressing patients. He "conservatively" assumes about 36 months from trial start to finish and now thinks potential commercialization won't come until the beginning of 2023. Chattopadhyay lowered his price target on ImmunoGen shares to $4 from $7 but keeps a Buy rating on the stock, which is down 31% to $2.19 in early trading.