TransMedics Group (TMDX) is a key player in transforming organ transplant therapy for patients with end-stage lung, heart and liver failure. The company offers Organ Care System, an integrated, compact, portable preservation technology that addresses unmet need for organs for transplantation. However, with a forward 12-month price-to-sales (P/E) ratio of 5.02X — above the Zacks Medical - Instruments industry average of 4.44X — there are concerns about the justification of TransMedics’ premium valuation in t ...