Erratum

Main text: After publication of this work [1] an error was noticed in Fig. 5c. Figure 5c shows representative images/fields of PTGS2 staining of mammary tumors derived from mice injected with parental SCP2 cells versus mice injected with p21/cyclinD1 depleted SCP2 cells. Tissue slides from the two groups of animals were stained with an anti-PTGS2 antibody. Results showed a decrease in PTGS2 staining in the cyclinD1/p21 depleted group compared to the parental group.

Fig. 5
figure 1

Depletion of cyclin D1 and p21 prevents mammary tumor growth and local invasion. a Parental SCP2 and p21/cyclin D1 double knockdown SCP2 cells were implanted into the mammary fat pad of four- to six-week-old female Balb/c nude mice. Mammary tumor growth was measured from two sets of mice and quantified for the tumor size at the indicated times (six per group; error bars indicate SEM). b Representative photographs show hematoxylin and eosin staining of the mammary gland (tumor and surrounding tissues) of mice at eight weeks post-injection. c Representative photographs show PTGS2 staining of parental (top panel) and p21/cyclin D1-depleted (lower panel) mammary tumors at eight weeks post-injection. Two mice were used in each group. d Representative radiographs of skeletal lesions in two group mice (parental and p21/cyclin D1-depleted SCP2) were taken by X-ray using Faxitron. Parental and p21/cyclin D1-depleted SCP2 cells were injected in tibia. The lesions are highlighted by arrows

Full size image

The tumor images in Fig. 5c came from two different mice for each group and not 4 as mistakenly indicated. Two representative images were used for each mouse but were largely overlapping. Thus, to avoid confusion, we have removed the overlapping images and retained 1 representative image for each of the 4 mice (2 mice injected with parental SCP2 cells and 2 mice injected with p21/cyclinD1 depleted SCP2 cells). We apologize for this error, which did not affect any of the interpretations or conclusions of the article.