The histologic types of gallbladder cancer include the following.[1] Some histologic types have a better prognosis than others; papillary carcinomas have the best prognosis.

• Carcinoma in situ.
• Adenocarcinoma, not otherwise specified (NOS).
• Papillary carcinoma.
• Adenocarcinoma, intestinal type.
• Mucinous carcinoma.
• Clear cell adenocarcinoma.
• Signet-ring cell carcinoma.
• Adenosquamous carcinoma.
• Squamous cell carcinoma.
• Small cell (oat cell) carcinoma.*
• Undifferentiated carcinoma.*
• Carcinoma, NOS.
• Carcinosarcoma.

*Grade 4 by definition.

References

1. Gallbladder. In: American Joint Committee on Cancer.: AJCC Cancer Staging Manual. 6th ed. New York, NY: Springer, 2002, pp 139-44. 
   
   

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