Cancers of the head and neck are unusual in that appears to have been little,
if any, improvement in survival rates over recent decades.
頭部及頸部的癌症怎麼了然後近幾十年的存活率有增加?

頭頸部癌症最近數十年的存活率似乎沒什麼/幾乎沒有改善，這種情況不尋常。 (little)似乎即使有改善也微乎其微

appears 前面少一個 there

兩位大感謝!!