How old is too old to be on a kids’ protocol for ALL?

“Above 50 years, the increase in age became highly significant,” Dr Huguet emphasized. “There were fewer CRs and lower survival.”

Treatment compliance

In terms of treatment compliance and median dose received in the induction course, patients aged 55-59 received significantly less L-asparaginase than those aged 18-54 (P<0.001).

During all 3 consolidation phases, patients aged 55-59 received significantly lower median doses of all medications—cytarabine, methotrexate, cyclophosphamide—than patients aged 18-54.

And in late intensification, patients aged 55-59 received significantly lower median doses of vincristine, prednisone, daunorubicin, and hyper-C than all other patients. The median doses of L-asparaginase and standard-C received were lower in the older patients but not significantly so.

EFS by age and randomization

The 5-year EFS for patients aged 18-54 was 57% with hyper-C, compared with 55% in the standard-C arm (P=0.66).

However, for older patients, there was a significant advantage for those receiving hyper-C. The 5-year EFS was 38% with hyper-C, compared to 12% with standard-C (P=0.007).

Dr Huguet explained that inferior compliance in patients 55 and older “might explain why a benefit associated with early hyper-C reinforcement became apparent in these older patients only.”

Dr Huguet concluded that the results “suggest that 55 years is likely to be the upper age limit to tolerate a pediatric-like therapy for younger adults with Ph-negative ALL.”

She added that patients over 54 might benefit from alternative front-line strategies.

Accordingly, investigators are planning to use new agents, such as blinatumomab or inotuzumab ozogamicin, in the next European Working Group on Adult ALL studies.