Only Binning Lyngkhoi, who had emerged Indian winner in the men's section of the Standard Chartered Mumbai Marathon last month, will take part in the Hong Kong event.
"Lalita will not take part in the Asian Marathon as she informed us that her examinations have begun and she is appearing in them," Athletics Federation of India Director M L Dogra told PTI.
A total of 41 top Asian marathoners from 21 countries will compete in the Asian Marathon Championship, which will be a part of the 17th Standard Chartered Hong Kong Marathon.
Individual participation from other Asian countries is also allowed but they will not be considered for results in the Asian Marathon Championship.