Is there evidence of long‑term functional, neurocognitive, and socioeconomic disabilities in adult survivors of pediatric brain tumors who were treated with surgery alone (no cranial radiation) during the 1970s‑1980s?

Long-term Disabilities in Adult Survivors of Pediatric Brain Tumors Treated with Surgery Alone

Yes, there is clear evidence that adult survivors of pediatric brain tumors treated with surgery alone during the 1970s-1980s experience significant long-term functional, neurocognitive, and socioeconomic disabilities, though these outcomes are substantially better than those who received radiation therapy.

Neurological and Functional Outcomes

The most comprehensive evidence comes from a study of 65 consecutive patients operated for benign brain tumors from 1970-1997 who received surgery only 1. After a median follow-up of 10.7 years:

• Only 31% had no neurological deficits
• 34% had minor deficits not interfering with daily activities
• 35% had moderate-to-severe deficits including severe ataxia, spastic paresis, seriously reduced vision, or poorly controlled epilepsy

Key patterns of recovery and persistence:

• 45% of patients with preoperative ataxia recovered fully
• 86% of patients with hemiparesis (6 of 7) had persistent deficits
• 57% of cranial nerve deficits from surgery persisted long-term
• 45% of patients with seizures at diagnosis remained seizure-free at follow-up

Females had significantly worse outcomes, with higher rates of both ataxia (P=0.02) and hemiparesis (P=0.03) 1.

Neurocognitive and Psychological Outcomes

Surgery-only patients experience substantial neurocognitive impairment, though less severe than radiation-treated survivors 2, 3. A 2019 study of adult survivors of pediatric low-grade gliomas demonstrated:

• Surgery-only survivors had estimated IQ of 101.2 compared to siblings at 108.5 (P<0.0001)
• Surgery plus radiation survivors scored significantly lower at 93.9 (P<0.0001)
• Younger age at diagnosis predicted worse outcomes across all domains (P<0.05) 3

Psychological adjustment problems are common even without radiation. A retrospective analysis found surgery-only pediatric neuro-oncology patients experienced significant short and long-term mood, behavioral, and academic adjustment problems compared to national averages 4.

Socioeconomic Outcomes

Adult survivors treated with surgery alone show impaired but functional socioeconomic outcomes 3, 5:

• Surgery-only survivors had lower occupation scores (OR 2.6), lower income (OR 2.6), and less education (OR 2.1) compared to siblings, though significantly better than radiation-treated survivors
• In a Norwegian series of infants treated 1973-1998, among 15 long-term survivors of low-grade tumors treated with surgery only: 8 were in full-time work, 3 in part-time work, and 4 were students 6
• Two-thirds of surgery-only low-grade tumor survivors achieved full-time employment 5

Critical Risk Factors

Age at diagnosis is the most consistent predictor of poor outcomes:

• Survivors diagnosed at younger ages (<7 years) had worse neurocognitive and socioeconomic outcomes across all studies 2, 3
• Infants (first year of life) had particularly concerning outcomes, with 50% impairment rates in adaptive functioning even decades later 6

Tumor location matters significantly:

• Posterior fossa tumors involving ponto-cerebellar regions carry higher risk due to cranial nerve and brainstem involvement 7
• Infratentorial tumors are associated with worse functional outcomes 1

Clinical Implications for Surveillance

These survivors require lifelong multidisciplinary surveillance 8:

• Annual rehabilitation assessments at preschool age, every 6 months at school age
• Comprehensive neurocognitive evaluation at key transition periods (ages 10-12,14-16, and 5 and 10 years post-diagnosis)
• Psychosocial screening at every follow-up visit for depression, anxiety, and behavioral problems 9
• Academic and vocational monitoring with expert employment appraisal by age 17+ 8
• Physical therapy referral for persistent motor deficits, particularly ataxia and hemiparesis 8

Common Pitfalls to Avoid

Do not assume surgery-only patients are "cured" without sequelae. Even without radiation, one-third have no deficits, one-third have minor deficits, and one-third have moderate-to-severe disabilities 1. The absence of radiation does not eliminate the need for comprehensive long-term follow-up and rehabilitation services, which should be accessible "even years after treatment" 8.