 CAMBRIDGE, Mass.--BUSINESS WIRE--Merrimack Pharmaceuticals, Inc. Nasdaq:MACK Merrimack or the Company today announced its second quarter 2021 financial results for the period ended June 30, 2021. We are pleased to report continued reductions in our operating expenses as well as positive overall cashflow during the quarter due to receipt of a tax refund, said Gary Crocker, Chairman of Merrimacks Board of Directors. Both Ipsen Pharmaceuticals and Elevation Oncology continue to repor 