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Method of calculating change rate of the psoas major muscle area (PMMA). PMMA was calculated as the sum of both the right and left area of the psoas major muscle at the L2–L3 position. In this case, PMMA before immune checkpoint inhibitor administration was 13.28 cm2, and PMMA at first visit was 16.24 cm2. Using these data, we could calculate the change rate of PMMA: Change rate of PMMA (%) = (1 − 13.28/16.24) × 100 = 18.3.
