Significant difference of duration until recurrence between HPV-positive and -negative tumors.

<p>Fifty BC samples of the patients from whom information were available were compared between HPV-positive and -negative groups (a), and ER/HPV-double positive, ER-single positive, HPV single positive and ER/HPV-double negative groups (b). Numbers in brackets indicate total number of samples for each case, respectively. Student’s t-test was performed, with <i>p</i>-values indicated on the graph.