Pulmonary invasive mucinous adenocarcinoma

Area of Science:

• Oncology
• Pathology
• Genomics

Background:

• Invasive mucinous adenocarcinoma (IMA) is a rare lung adenocarcinoma subtype characterized by goblet/columnar cells with intracytoplasmic mucin.
• While KRAS mutations are common, distinct genomic alterations like NRG1 and ERBB2 fusions are increasingly identified.
• IMAs often exhibit a pneumonic-like pattern with multifocal involvement, suggesting intrapulmonary metastases.

Purpose of the Study:

• To review recent advancements in the histopathological, clinical, and molecular characteristics of IMA.
• To highlight the unique features of IMA that necessitate distinct therapeutic strategies compared to nonmucinous adenocarcinomas.
• To identify and discuss unresolved issues for future research in IMA.

Main Methods:

• Literature review of recent studies on invasive mucinous adenocarcinoma.
• Analysis of histopathological, clinical, and molecular data from published research.
• Comparative genomic profiling interpretation.

Main Results:

• IMA is defined by specific cellular morphology and mucin content.
• Key molecular drivers include KRAS mutations, NRG1, and ERBB2 fusions.
• Distinctive clinical presentation and genomic profiles suggest intrapulmonary spread.

Conclusions:

• IMA possesses unique histopathological, clinical, and molecular features.
• These unique characteristics necessitate tailored therapeutic approaches.
• Further research is required to address current knowledge gaps in IMA management.