Quote from From Wiki
M×0 was serialized in the manga magazine Weekly Shōnen Jump between May 1, 2006 and May 19, 2008 and is published by Shueisha.2 Ten bound volumes were released in Japan. The manga was intended to run for longer, but due to the low ratings it had in Weekly Shōnen Jump it was put up for cancellation.
The Pretty Face manga was first serialized in the manga magazine Weekly Shōnen Jump. The first bound volume was released on October 4, 2002 and ended in Japan in November 2003. The manga series has a rather abrupt ending, finishing with fifty-two chapters and one extra chapter. It was intended to run longer, but was canceled due to the low ratings it had in Weekly Shōnen Jump. The last chapter featured additional information and alternate endings, as well as some original storyboard art.
The Pretty Face manga was first serialized in the manga magazine Weekly Shōnen Jump. The first bound volume was released on October 4, 2002 and ended in Japan in November 2003. The manga series has a rather abrupt ending, finishing with fifty-two chapters and one extra chapter. It was intended to run longer, but was canceled due to the low ratings it had in Weekly Shōnen Jump. The last chapter featured additional information and alternate endings, as well as some original storyboard art.
Found the reason for Mx0 and Pretty Face being axed. Also, is it just me or do all of KANO Yasuhiro series get axed I mean other than thoes two the rost of the stuff that he has done is all oneshots