Evidence and Efficacy
CHOEP21 was developed in the 1980s in an effort to improve outcomes in high grade Non Hodgkin lymphoma.r CHOEP21 was further explored in the NHL-B trial of the German high grade non Hodgkin lymphoma study group (DSHNHL) led by Pfreundschuh et al. which compared CHOP and CHOEP in patients aged 18-60 (NHL-B1 trial) and in patients aged 61-75 (NHL-B2 trial) with aggressive B and T cell NHL. These two trials compared 6 cycles of CHOP delivered every 3 weeks (CHOP-21) with dose intensification by adding etoposide (CHOEP-21), reducing the interval between cycles to 2 weeks (CHOP-14), or both (CHOEP-14). The 2-weekly regimens were supported with mandatory prophylactic granulocyte colony-stimulating factor (G-CSF), whereas in the 3-weekly regimens, G-CSF was administered at the treating physician’s discretion.r
The trial was not designed to see which of the 4 treatment arms were better however the following observations were made. In the NHL-B1 trial involving patients aged 18-60, CHOEP14 and CHOEP21 were associated with the highest CR rate (90% and 85%) and 5-year event-free survival rates (69.2% for both). However, when overall survival was compared, the 14 day schedules (CHOP14 and CHOEP14) were superior to the 21 day schedules. There was no difference in OS between CHOP14 and CHOEP14. In the NHL-B2 trial involving patients aged 61-75, both etoposide-containing arms (CHOEP-14 and CHOEP-21) were associated with significantly more toxicity than the CHOP arms.r
In another study, Pfreundschuh et al. compared CHOEP21 to a higher intensity CHOEP (‘High CHOEP21’) in the 18-60 age group comprising patients with both B and T cell high grade NHL. This study was stopped early owing to the MInT study demonstrating superiority of RCHOP to CHOP. There appeared to be no differences in efficacy as measured by EFS between the two arms.r
Schmitz et al. performed an analysis of 320 patients with mature nodal or extranodal T cell or NK cell lymphoma, receiving CHOP or CHOP-like regimens involved in 8 prospective DSNHL trials between 1993 and 2007. CHOEP had a significantly higher 3 year EFS compared with CHOP in the 18-60 age group (75% vs 51%). There was no difference in OS (81% vs 75%). It is worth noting that ALCL was disproportionately represented in this analysis with 60% of patients having ALK-positive or ALK-negative disease. This EFS advantage was not seen in patients over 60 where toxicity was considered too great.r
Toxicity
Grade 3 and 4 (%) (patients 18-60)r
Toxicity |
CHOEP21 |
Leukocytopenia |
87.2 |
Thrombocytopenia |
9.6 |
Anaemia |
11.8 |
Infection |
10.8 |
Polyneuropathy |
3.3 |
mucositis |
2.7 |
Cardiac toxicity |
0.5 |
Lung toxicity |
0.0 |
nausea and vomiting |
0.0 |
Alopecia |
4.8 |
Therapeutic intervention |
Red blood cell transfusions |
11.2 |
Platelet transfusion |
2.1 |
Antibiotics (IV) |
32.6 |
© Adapted from Annals of Oncology 2007