Most cancers have five stages, and each particular stage is an indicator of how far the cancer has advanced (e.g., size of tumour; metastasis to other organs, etc.), and not the actual speed of the progression itself. Having said that, I certainly agree with your interpretation of "accumulated fatigue, exacerbated by the cancer". More than anything, considering the condition he was in, I am really amazed by the fact that LCW was able both to win the Malaysia Open and advance as far as the SF in the Indonesia Open. Absolutely phenomenal!