The role of surveillance computed tomography in patients with follicular lymphoma

Shunsuke Hatta; Suguru Fukuhara; Takahiro Fujino; Yo Saito; Yuta Ito; Shinichi Makita; Wataru Munakata; Tatsuya Suzuki; Dai Maruyama; Masahiko Kusumoto; Koji Izutsu

doi:10.1177/20406207221095963

The role of surveillance computed tomography in patients with follicular lymphoma

Ther Adv Hematol. 2022 May 14:13:20406207221095963. doi: 10.1177/20406207221095963. eCollection 2022.

Authors

Affiliations

¹ Department of Hematology, National Cancer Center Hospital, Tokyo, Japan.
² Department of Hematology, National Cancer Center Hospital, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan.
³ Department of Diagnostic Radiology, National Cancer Center Hospital, Tokyo, Japan.

Abstract

Introduction: Surveillance computed tomography (CT) is performed during the follow-up of patients with lymphoma who have completed initial therapy. However, studies on the clinical benefit of surveillance CT for patients with incurable subtypes, such as follicular lymphoma (FL), are limited. This study aimed to evaluate the value of surveillance CT for patients with FL after achieving the first complete response (CR) or CR unconfirmed in the rituximab era.

Methods: We retrospectively reviewed the medical records of patients with FL who achieved CR with first-line treatment between 2000 and 2016 at our institution. In patients who experienced first relapse, we examined the patient's clinical characteristics at the time of relapse, subsequent therapies, and post-relapse survival, based on the method of relapse detection.

Results: Of the 248 patients who achieved CR after initial therapy, 109 had a relapse, with a median follow-up of 11 years; 100 were enrolled into this study. Relapse was detected by surveillance CT in 61 patients (surveillance CT group) and by means other than surveillance CT, such as the presence of patient-reported symptoms, physical findings, and blood work-up abnormalities (non-surveillance CT group), in 39 patients. There was no significant difference in the patients' characteristics at the time of relapse between the two groups, except for a higher incidence of extranodal involvement in the non-surveillance CT group. The method of relapse detection did not affect therapeutic selection after relapse and post-relapse survival. In this study, 86.8% of the 38 patients who relapsed with only deep lesions, such as mesenteric or retroperitoneal lymph nodes, had surveillance CT-detected relapse.

Conclusion: Surveillance CT did not show any clinical benefit for patients with FL in CR; however, it might lead to early detection of relapse in cases of deep lesions that cannot be identified without imaging.

Keywords: B-cell non-Hodgkin lymphoma; follicular lymphoma; surveillance computed tomography.