"Repeat or Single Quadratus Lumborum Block for the Reduction of Opioid Prescriptions After Surgery in Retroperitoneal Sarcoma Patients (RESQU-SARC Trial)"

Patients receive standard of care liposomal bupivacaine injection before and during surgery, followed by standard of care non-opioids and opioids at days 0-3 after surgery in the absence of unacceptable toxicity

"Patients receive standard of care liposomal bupivacaine injection before and during surgery, followed by standard of care non-opioids and opioids at days 0-3 after surgery in the absence of unacceptable toxicity. Patients receive a second liposomal bupivacaine injection (RESQU block) on day 4 after surgery"

Ancillary studies