Drug store chain Walgreen (WAG) reported an 8.8% year-over-year jump in April sales, hitting the $6.49 billion mark. 

Comparable-store sales -- a key metric for retailers that tracks only stores that were open in the comparable period -- jumped 7.6%. 

A late Easter holiday contributed to the increased revenue, with the holiday falling on April 20, compared to March 31 last year. Walgreen said basket sizes increased 5.6%, due to the holiday purchases.

Pharmacy sales were also up by 9.2% and accounted for 64.5% of total Walgreen sales. Comparable-store pharmacy sales were up 7.3%.

Year-to-date sales have totaled $25.36 billion, an increase of 5.4% from the same period last year. Fiscal year-to-date sales are up 5.8% in the first eight months.

Deerfield, IL-based Walgreen has 8,231 drugstores in the United States, 145 more than it did last year.

Walgreen shares are up 22% year-to-date and are trading around $70 per share.
 

Follow Katie Roof on Twitter @Katie_Roof