Treatment outcome of atypical EGFR mutations in the German National Network Genomic Medicine Lung Cancer (nNGM)

BACKGROUND

Atypical EGFR mutations occur in 10-30% of NSCLC patients with EGFR mutations and their sensitivity to classical EGFR-tyrosine kinase inhibitors (TKI) is highly heterogeneous. Patients harboring one group of uncommon, recurrent EGFR mutations (G719X, S768I, L861Q) respond to EGFR-TKI. Exon 20 insertions are mostly insensitive to EGFR-TKI but display sensitivity to exon 20 inhibitors. Clinical outcome data of patients with very rare point and compound mutations upon systemic treatments are still sparse to date.

PATIENTS AND METHODS

In this retrospective, multi-center study of the national Network Genomic Medicine (nNGM) in Germany, 856 NSCLC cases with atypical EGFR mutations including co-occuring mutations were reported from 12 centers. Clinical follow-up data after treatment with different EGFR-TKI, chemotherapy and immune checkpoint inhibitors were available from 260 patients. Response to treatment was analyzed in three major groups: (1) uncommon mutations (G719X, S7681, L861Q and combinations), (2) exon 20 insertions and (3) very rare EGFR mutations (very rare single point mutations, compound mutations, exon 18 deletions, exon 19 insertions).

RESULTS

Our study comprises the largest thus far reported real-world cohort of very rare EGFR single point and compound mutations treated with different systemic treatments. We validated higher efficacy of EGFR-TKI in comparison to chemotherapy in group 1 (uncommon), while most exon 20 insertions (group 2) were not EGFR-TKI responsive. In addition, we found TKI sensitivity of very rare point mutations (group 3) and of complex EGFR mutations containing exon 19 deletions or L858R mutations independent of the combination partner. Notably, treatment responses in group 3 (very rare) were highly heterogeneous. Co-occurring TP53 mutations exerted a non-significant trend for a detrimental effect on outcome in EGFR-TKI treated patients in groups 2 and 3 but not in group 1.

CONCLUSIONS

Based on our findings we propose a novel nNGM classification of uncommon EGFR mutations.

Severe spontaneous intracranial haematoma in a HIV-negative 66-year-old mild haemophiliac. Complete recovery with the use of 1-month factor VIII replacement

Intracranial haemorrhage is the most feared manifestation of haemophilia and is usually seen in severe forms. We report herein the case of a 66-year-old HIV-negative patient with mild haemophilia (factor VIII: 7%) who presented with a spontaneous and massive intracranial haematoma causing hemiplegia and aphasia. We discuss the management of this peculiar situation emphasizing the need for rapid and adapted FVIII replacement. A complete recovery was obtained using this strategy combined with initial resuscitation measures and subsequent physical therapy.

[Evolution towards generalization and cancer of a muco-cutaneous leishmaniasis treated with corticoids. (Report of a Chadian case) (author's transl)]

The authors present a case of muco-cutaneous leishmaniasis in the Republic of Chad. In that case, a long duration treatment with corticoids entailed the generalization of the disease in the form of a secondary kala-azar and the appearance of a histiocytosarcoma on the scar left by the oriental sore. Comments on the pathogenesis of leishmaniasis are then exposed.