You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Most common site for squamous cell carcinoma of esophagus is and explain in detail?
Ans. is 'b' i.e., Middle 1/3* Esophageal Carcinoma is of two common histological typesi) Squamous cell Ca - the MC type in world (-95% according to Sabiston)ii) Adenocarcinoma - where incidence is increasing at a rapid rate and is now the MC type in USA (Ref: Harrison, Schwartz)* Distribution of Squamous Cell Ca.# Upper 1/3 - 10%# Middle 1/3 - 60%# Lower 1/3 - 30% * Adenocarcinoma is mainly located in lower 1/3.