Comparative univariate statistical analysis of the characteristics of follicular lymphoma (FL) 1–3B (14;18)-positive patients with and without CREBBP KAT missense mutations showed no statistically significant differences in the examined characteristics between these groups, except for one characteristic—SUVmax (standardized uptake value): in the group of patients with the KAT missense mutation, SUVmax values were significantly lower than in the group without the mutation. The gene discussed is CREBBP; the disease is follicular lymphoma.