Table 5 shows the proportion of significant decline in four-month individual HVLT-R scores and clinical factors. The patients with KPS ≤ 70 were significantly more likely to have declined TR scores at four months compared to the patients with KPS ≥ 80 (Fisher’s exact test, p = 0.013). Similarly, the patients who underwent two examinations (worse-prognosis group; baseline and four months) were significantly more likely to have declined TR scores (p = 0.0017) and DR scores (p = 0.035) compared to the patients who underwent three examinations (better-prognosis group; baseline, four, and eight months).