Bay Area's second IPO of the year just got a lot bigger

Revolution Medicines Inc. is apparently hearing good things from the investor road show ahead of its IPO that's planned for Thursday. The Redwood City oncology biotech now hopes to raise up to $273.7 million in an offering that is about 48 percent bigger than it targeted a week ago. It now hopes to sell 14 million shares for between $16 and $17 each. That's up from last week's plan to sell 10 million shares for between $14 and $16. It has also increased the number of shares available to insiders…