PKU HealthCare Corp.,Ltd. (SZSE:000788) shareholders that were waiting for something to happen have been dealt a blow with a 28% share price drop in the last month. The drop over the last 30 days has capped off a tough year for shareholders, with the share price down 36% in that time.

In spite of the heavy fall in price, given close to half the companies in China have price-to-earnings ratios (or "P/E's") below 26x, you may still consider PKU HealthCareLtd as a stock to avoid entirely with its 52.8x P/E ratio. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the highly elevated P/E.

Recent times have been quite advantageous for PKU HealthCareLtd as its earnings have been rising very briskly. The P/E is probably high because investors think this strong earnings growth will be enough to outperform the broader market in the near future. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

Does Growth Match The High P/E?

There's an inherent assumption that a company should far outperform the market for P/E ratios like PKU HealthCareLtd's to be considered reasonable.

If we review the last year of earnings growth, the company posted a terrific increase of 67%. EPS has also lifted 24% in aggregate from three years ago, mostly thanks to the last 12 months of growth. Accordingly, shareholders would have probably been satisfied with the medium-term rates of earnings growth.

This is in contrast to the rest of the market, which is expected to grow by 42% over the next year, materially higher than the company's recent medium-term annualised growth rates.

In light of this, it's alarming that PKU HealthCareLtd's P/E sits above the majority of other companies. Apparently many investors in the company are way more bullish than recent times would indicate and aren't willing to let go of their stock at any price. Only the boldest would assume these prices are sustainable as a continuation of recent earnings trends is likely to weigh heavily on the share price eventually.

The Bottom Line On PKU HealthCareLtd's P/E

A significant share price dive has done very little to deflate PKU HealthCareLtd's very lofty P/E. Typically, we'd caution against reading too much into price-to-earnings ratios when settling on investment decisions, though it can reveal plenty about what other market participants think about the company.

Our examination of PKU HealthCareLtd revealed its three-year earnings trends aren't impacting its high P/E anywhere near as much as we would have predicted, given they look worse than current market expectations. When we see weak earnings with slower than market growth, we suspect the share price is at risk of declining, sending the high P/E lower. Unless the recent medium-term conditions improve markedly, it's very challenging to accept these prices as being reasonable.

A lot of potential risks can sit within a company's balance sheet. Take a look at our free balance sheet analysis for PKU HealthCareLtd with six simple checks on some of these key factors.

It's important to make sure you look for a great company, not just the first idea you come across. So take a peek at this free list of interesting companies with strong recent earnings growth (and a low P/E).

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.