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Primary adenocarcinoma of chest wall — Clinical Guidelines

Overview

Primary adenocarcinoma of the chest wall is a rare malignancy that originates from the chest wall structures, including the parietal pleura, ribs, sternum, or soft tissues. This condition is clinically significant due to its potential for local invasion and distant metastasis, impacting respiratory function and overall quality of life. It predominantly affects adults, though cases in pediatric populations are documented, often presenting unique challenges in management due to growth considerations and preservation of function. Early diagnosis and appropriate surgical intervention are crucial for optimal outcomes, making familiarity with its clinical presentation and management essential for clinicians in thoracic surgery and oncology. 1 2 5

Pathophysiology

Primary adenocarcinomas of the chest wall arise from epithelial cells within the chest wall tissues, often originating from the pleura or extrapleural sites. The molecular mechanisms underlying their development are not fully elucidated but likely involve genetic mutations and alterations in signaling pathways such as the TP53, EGFR, and KRAS pathways, which contribute to uncontrolled cell proliferation and tumor progression. These genetic changes can disrupt normal cellular processes, leading to local invasion into adjacent structures like ribs, sternum, and intercostal muscles, and potentially hematogenous spread to distant organs. The heterogeneity of these tumors complicates both diagnosis and treatment, necessitating a multidisciplinary approach to manage the complex interplay of biological factors and clinical presentations. 1 2

Epidemiology

The incidence of primary chest wall adenocarcinomas is relatively low compared to other malignancies, with limited population-based studies providing precise figures. These tumors predominantly affect adults, with a slight male predominance observed in some series. Geographic and environmental risk factors are not well-defined, though occupational exposures to asbestos and other carcinogens have been implicated in some cases. Trends over time suggest a stable incidence with occasional spikes noted in regions with heightened occupational exposures. Pediatric cases are exceedingly rare, often presenting unique diagnostic and therapeutic challenges due to the developmental stage of the patients. 2 5

Clinical Presentation

Patients with primary adenocarcinoma of the chest wall typically present with nonspecific symptoms such as chest pain, dyspnea, and weight loss, which can delay diagnosis. Local symptoms may include palpable masses, cough, and signs of pleural effusion. Atypical presentations can include neurological symptoms if the tumor compresses adjacent structures like nerves or vessels. Red-flag features include rapid tumor growth, unexplained weight loss, and systemic symptoms indicative of metastasis. Early recognition of these signs is crucial for timely intervention and improved outcomes. 1 6

Diagnosis

The diagnostic approach for primary adenocarcinoma of the chest wall involves a combination of imaging studies, histopathological analysis, and sometimes molecular profiling. Key steps include:

Imaging Studies: Chest CT and MRI are essential for delineating tumor extent and involvement of adjacent structures. PET-CT may help assess for metastatic spread.

Biopsy: Core needle biopsy or open biopsy under imaging guidance is necessary for definitive histopathological diagnosis.

Histopathological Criteria: Identification of glandular structures or adenomatous patterns with malignant features confirms adenocarcinoma. Immunohistochemical staining for markers like CK7, CK20, and TTF-1 aids in subclassification.

Differential Diagnosis:

- Mesothelioma: Typically shows more diffuse pleural involvement and specific immunohistochemical profiles. - Lung Cancer Metastases: Originates from primary lung lesions and often shows different histological features. - Soft Tissue Sarcomas: Usually lacks pleural or chest wall bone involvement and has distinct histological patterns.

Specific Tests and Criteria:

CT Scan: Evaluate tumor size, location, and involvement of ribs/sternum.

MRI: Detailed assessment of soft tissue involvement and neural structures.

PET-CT: Metabolic activity indicative of malignancy and metastatic assessment.

Biopsy: Histopathology confirming adenocarcinoma with malignant glandular structures.

Immunohistochemistry: CK7+, CK20-, TTF-1 variable, depending on subtype.

(Evidence: Moderate) 1 2 6

Management

Surgical Resection

Primary Approach: Radical resection with clear margins is the cornerstone of treatment. Techniques include en bloc resection of involved ribs, sternum, and soft tissues.

Minimally Invasive Techniques: Video-assisted thoracoscopic surgery (VATS) can be employed for smaller tumors to minimize trauma and improve cosmesis, particularly in younger patients.

Reconstruction Methods:

- Rigid Materials: Titanium plates and meshes for structural support. - Flexible Materials: Acellular collagen matrices combined with muscle flaps for flexibility and reduced complications. - Special Techniques: Arena roof technique for extensive resections to maintain chest wall function.

Specifics:

Resection: En bloc resection with ≥ 2 cm margins.

Reconstruction: Titanium mesh or acellular collagen matrix with muscle flap coverage when necessary.

Postoperative Care: Close monitoring for respiratory function and pain management.

(Evidence: Moderate) 1 3 4

Neoadjuvant and Adjuvant Therapy

Neoadjuvant Therapy: Chemotherapy or radiotherapy may be considered preoperatively to reduce tumor size and improve resectability.

Adjuvant Therapy: Post-surgery, adjuvant chemotherapy or radiotherapy is recommended based on tumor stage, histology, and margins.

Specifics:

Chemotherapy: Platinum-based regimens (e.g., cisplatin) for advanced stages.

Radiotherapy: Post-operative radiation for positive margins or high-risk features.

(Evidence: Moderate) 2 5

Palliative Care

Symptom Management: Focus on pain control, respiratory support, and addressing functional impairments.

Referral: Early involvement of palliative care teams for comprehensive symptom management.

(Evidence: Expert opinion) 5

Complications

Acute Complications: Pneumonia, respiratory insufficiency, and wound infections.

Long-term Complications: Chest wall deformity, chronic pain, and functional impairment of the upper extremities.

Management Triggers: Persistent fever, increased pain, signs of respiratory distress, or wound dehiscence warrant immediate intervention.

(Evidence: Moderate) 1 5

Prognosis & Follow-up

Prognosis varies significantly based on tumor stage, histological subtype, and completeness of resection. Prognostic indicators include negative surgical margins, absence of lymph node involvement, and early-stage disease. Recommended follow-up includes:

Imaging: Chest CT every 3-6 months for the first 2 years, then annually.

Clinical Assessments: Regular physical exams focusing on respiratory function and local recurrence signs.

Laboratory Tests: Tumor markers if relevant to the subtype (e.g., CEA, CA 125).

(Evidence: Moderate) 2 5

Special Populations

Pediatric Patients

Approach: Minimally invasive techniques with emphasis on preserving growth and function.

Reconstruction: Avoid mesh use due to growth considerations; prefer muscle flaps.

Follow-up: More frequent monitoring for growth and development impacts.

(Evidence: Expert opinion) 1

Elderly Patients

Considerations: Higher risk of comorbidities; tailored surgical approaches balancing radicality with functional preservation.

Management: Close multidisciplinary collaboration to manage comorbidities and postoperative recovery.

(Evidence: Moderate) 5

Key Recommendations

Surgical Resection: Perform en bloc resection with clear margins ≥ 2 cm for optimal local control. (Evidence: Moderate) 1 2

Minimally Invasive Techniques: Consider VATS for smaller tumors to reduce morbidity, especially in younger patients. (Evidence: Moderate) 1

Reconstruction: Use titanium mesh or acellular collagen matrix with muscle flap coverage when necessary to minimize complications. (Evidence: Moderate) 3 4

Adjuvant Therapy: Base adjuvant chemotherapy or radiotherapy on tumor stage, histology, and margin status. (Evidence: Moderate) 2 5

Early Palliative Care: Integrate palliative care early to manage symptoms and improve quality of life. (Evidence: Expert opinion) 5

Frequent Follow-up: Schedule regular imaging and clinical assessments post-surgery to monitor for recurrence and functional outcomes. (Evidence: Moderate) 2 5

Tailored Approaches for Special Populations: Adapt surgical techniques and follow-up protocols for pediatric and elderly patients considering their unique needs. (Evidence: Expert opinion) 1 5

Avoid Large Incisions: Opt for less invasive approaches like axillary incisions to preserve upper extremity function and cosmesis, particularly in young patients. (Evidence: Moderate) 1

Monitor for Complications: Vigilantly monitor for signs of postoperative complications such as respiratory insufficiency and infections. (Evidence: Moderate) 1 5

Consider Neoadjuvant Therapy: Evaluate neoadjuvant chemotherapy or radiotherapy for tumors deemed unresectable initially to improve resectability. (Evidence: Moderate) 2 5

References

1 Doi R, Ichikawa H, Matsumoto K, Tomoshige K, Machino R, Okano S et al.. Curved Axillary Incision with Video-Assisted Thoracoscopic Surgery: An Alternative Approach for Teenage Female with Large Apical Chest Wall Tumor. Annals of thoracic and cardiovascular surgery : official journal of the Association of Thoracic and Cardiovascular Surgeons of Asia 2024. link 2 Maistry N, Durell J, Wilson S, Lakhoo K. Primary paediatric chest wall tumours necessitating surgical management. Annals of the Royal College of Surgeons of England 2020. link 3 da Nobrega Oliveira REN, D Ambrosio PD, Salvador ICMC, Martins MAB, Campos JRM. Reconstruction of the Chest Wall in Primary and Secondary Tumors: A Systematic Review and Meta-Analysis Comparing Rigid Versus Flexible Materials. Annals of surgical oncology 2025. link 4 Rocco G, La Rocca A, La Manna C, Martucci N, De Luca G, Accardo R. Arena Roof Technique for Complex Reconstruction After Extensive Chest Wall Resection. The Annals of thoracic surgery 2015. link 5 Chudacek J, Bohanes T, Szkorupa M, Klein J, Stasek M, Zalesak B et al.. Strategies of treatment of chest wall tumors and our experience. Rozhledy v chirurgii : mesicnik Ceskoslovenske chirurgicke spolecnosti 2015. link 6 Grozavu C, Fera A, Iliaş M, Marin D, Pantile D, Dabelea C. Anterior thoracic wall giant tumor--special surgical procedure. Chirurgia (Bucharest, Romania : 1990) 2012. link

Primary adenocarcinoma of chest wall