Sequencing of chemotherapy in total neoadjuvant treatment for rectal cancer does not predict radiation-induced lymphopenia

Abstract

Background. Radiation-induced lymphopenia (RIL) is associated with an increased risk of death in solid tumors, including rectal cancer. The aim of this study was to determine whether the sequencing of chemotherapy in total neoadjuvant treatment (TNT) for rectal cancer predicts the development of radiation-induced lymphopenia.

Patients and methods. We analyzed acute hematologic toxicity data from 53 patients who underwent TNT for locally or locoregionally advanced rectal cancer between July 2022 and April 2023. Twenty-eight patients received induction chemotherapy, and 25 received consolidation chemotherapy (6 cycles of XELOX). The chemoradiation protocol consisted of VMAT-SIB RT up to 48.4 Gy in 22 fractions, concomitantly with capecitabine BID. The Mann-Whitney U test was performed to compare RIL between the two patient groups. Pelvic bone marrow was contoured as a non-limiting organ-at-risk to assess the received dose, and binary logistic regression was used to determine whether RIL depends on V_5Gy~V_42Gy or the PTV size.

Results. Thirty-four patients (64.2%) developed RIL of any grade, which was not significantly associated with either the induction or consolidation chemotherapy TNT regimen (Wald = 3.159, p = 0.076). No significant differences were found in neutrophil counts or the neutrophil-to-lymphocyte ratio. In the logistic regression model predicting the likelihood of RIL, two variables were statistically significant: V_10Gy (Wald = 4.366, p = 0.037) and V_30Gy (Wald = 6.084, p = 0.014). These results indicate that V_10Gy < 71% and V_30Gy < 26.6% may reduce the likelihood of developing RIL.

Conclusions. In our study, the sequencing of chemotherapy in TNT for rectal cancer did not predict the development of RIL. However, the incidence of RIL may be reduced by applying dosimetric constraints to the pelvic bone marrow.