Pyriform sinus cancer: a clinical and laboratory study

Area of Science:

• Otolaryngology
• Oncology
• Surgical Pathology

Background:

• Hypopharyngeal cancer is a rare malignancy.
• The pyriform sinus is the most common subsite for hypopharyngeal cancer.
• Most patients present with advanced disease.

Purpose of the Study:

• To analyze treatment outcomes for pyriform sinus cancer.
• To determine the efficacy of different treatment modalities.
• To evaluate the patterns of invasion and spread.

Main Methods:

• Retrospective review of 152 pyriform sinus cancer cases.
• Analysis of survival rates based on treatment: surgery, radiotherapy, or combined therapy.
• Histopathological examination of 51 surgical specimens to assess invasion patterns.

Main Results:

• Pyriform sinus cancer occurred 19 times more frequently than postcricoid cancer.
• 90% of tumors were advanced (T3) at diagnosis, with 66% having cervical node metastasis.
• Three-year disease-free survival rates: surgery (29%), radiotherapy (4%), combined therapy (36%).
• T1-T2 medial wall lesions may be curable with radiotherapy.
• Extensive cartilage invasion (thyroid and cricoid) was observed in 22/51 cases, precluding conservative surgery.

Conclusions:

• Combined preoperative radiotherapy and surgery yield the best survival outcomes for pyriform sinus cancer.
• Early-stage (T1-T2) medial wall pyriform sinus cancers might be candidates for radiotherapy alone.
• Advanced stage and extensive cartilage invasion significantly impact prognosis and surgical candidacy.