How Doctors Measure Success How Doctors Measure Success Doctors judge whether a MEK inhibitor is working in two main ways: by measuring the tumor on MRI scans and by asking how you’re feeling, including your pain and how well you can move and function, says Giglio. Tumor Volume Plexiform neurofibromas are measured with volumetric MRI, which calculates a tumor’s full three-dimensional size. In clinical trials, a tumor was considered responsive to treatment if it shrank by at least 20 percent and the change held up on a second scan two to six months later.e60dc2a1-f33c-4a05-9b50-8e3e8e5976298352e53e-3619-4b0e-b4ed-802507f3eeb8 Because tumors…
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